SporttM«12010;40(3) 189-2060l1Z-1M2/10/0OO3-0ia9/M').9&/0

© 2010 A * Dota tnlormottan BV. Al ngnii tMervM.

New Horizons for the Methodology andPhysiology of Training PeriodizationVladimir B. Issurin

Elite Sport Department, Wingate Institute, Netanya, Israel

ContentsAbstract 1891. Traditional Modei of Periodization 190

1.1 History of Training Periodization as o Scientific Probiem and Coaching Concept 1911.1.1 Precursors of Periodization Training in Ancient Rome and Greece 1911.1.2 Contemporary Stage of Developing Training Periodization 191

1.2 Basic Positions of the Troditionoi Model 1911.2.1 Genefolized Concept of 'Load-Recovery' Interaction 1911.2.2 Principies of Periodlzed Training 1921.2.3 iHierarchy of Perlodized Troining Cycles 1931.2.4 Variations of the Traditionai Annual Cycie Mode! 193

1.3 Mojor Limitations of Traditionai Periodization 1932. Aiternative Modeis of Periodization 194

2.1 Factors Affecting the Revision of Traditionai Periodization 1952.2 Periodizotlon Charts in Team Sports 1952.3 Linear and Non-Linear Periodization 1962.4 Non-Troditionai Models of Training Design 197

2.4.1 Annual Performance Trends of Great Athietes 1972.4.2 Concentrated Unidirectionoi Training Pians 197

3. Block Periodization as an Alternative Approach to iHigh-Performance Training 1983.1 Earliest Efforts to implement Biock Periodization 1983.2 Scientific Concepts Affecting fhe Biock-Periodized Model 199

3.2.1 Cumulative Training Effect 1993.2.2 Residual Training Effect 200

3.3 Basic Positions of Biock-Periodized Training 2013.3.1 Basic Principles 2013.3.2 Taxonomy of Mesocycle Biocks 2013.3.3 Compiling an Annual Cycie 202

4. Conclusions 203

Abstract The theory of training was established about five decades ago whenknowledge of athletes" preparation was far from complete and the biologicalbackground was based on a relatively small amount of objective researchfindings. At that time, traditional 'training periodization'. a division ofthe entire seasonal programme into smaller periods and training units,was proposed and elucidated. Since then, internationa! sport and sportscience have experienced tremendous changes, while the traditional training

190 Issuriii

periodization has remained at more or less the same level as the publishedstudies of the initial publications. As one of the most practically orientedcomponents of theory, training periodization is intended to offer coachesbasic guidelines for structuring and planning training. However, duringrecent decades contradictions between the traditional model of periodizationand the demands of high-performance sport practice have inevitably deve-loped. The main limitations of traditional periodization stemmed from:(i) conliicting physiological responses produced by "mixed" training directedat many athletic abilities: (H) excessive fatigue elicited by prolonged periods ofmulti-targeted training: (iii) insufficient training stimulation induced byworkloads of medium and low concentration typical of'mixed" training; and(iv) the inability to provide multi-peak performances over the season. Theattempts to overcome these limitations led to development of alternativeperiodization concepts. The recently developed block periodization modeloffers an alternative revamped approach for planning the training ofhigh-performance athletes. Its general idea proposes the sequencing ofspecialized training cycles, i.e. blocks, which contain highly concentratedworkloads directed to a minimal number of targeted abilities. Unlike thetraditional model, in which the simultaneous development of many athleticabilities predominates, block-periodized training presupposes the consecutivedevelopment of reasonably selected target abilities. The content ofbiock-periodized training is set down in its general principles, a taxonomy ofmesocycle blocks, and guidelines for compiling an annual plan.

Sport science is widely held to be the majorcontributor to progress in sport, and in particularto the enhancement of athletic training. Its gen-eral theory sets out and summarizes the mostmeaningful basic assumptions regarding the es-sence, terminology, major effects and scientificbackground for training athletes.

Training periodization is definitely one of themost practically oriented branches of trainingtheory. It was established in general in the 1960sand was initially based on the experience of high-performance sport in the former USSR andphysiological surveys published by prominentSoviet scientists at that time.''"'*' A little later,training periodization was conceptualized,'^^ re-published in many countries'^'^^ and took on thestatus of a universal and monopolistic back-ground for training planning and analysis.

Certainly, the continued evolution of sportand sport science has contributed to an enormousaccumulation of knowledge, evidence and train-ing technologies. Nonetheless, the traditionalmodel of periodization as established about fivedecades ago has not changed much since then.

During this time, and especially in recent years.alternative approaches to training design haveappeared, mostly in professional reports andcoaches* magazines, and have been subjected tolittle, if any, serious scientific consideration. Thepurpose of this paper is to review training peri-odization in the light of the outcomes of previousand recent studies of the traditional model andup-to-date versions of training design.

1. Traditional Modei of Periodization

As athletic training becomes more strenuousand professional, the need for a scientific back-ground for conscious planning becomes moredesirable. Thus, "training periodization" met theexpectations of practice: it was described as thepurposeful sequencing of different training units(long duration, medium duration and short-termtraining cycles and sessions) so that athletes couldattain the desired state and planned results. Thissection introduces a brief history of trainingperiodization and its basic tenets, which underliethe popular traditional model used worldwide.

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New Horizons for Training PeritKÜzation 191

1,1 History of Training Periodization as aScientific Probiem and Coaching Concept1.1. Ï Precursors of Periodization Training in AncientRome and Greece

The history of ancient medicine and philoso-phy provides us with memorable milestones oftraining theory. These pieces oí" human creationinclude the names of great ancient thinkers suchas Galen and Philostratus. The famous Romanphysician and philosopher Galen (Claudius Ae-lius Galcnus. second century AD) in his treatisePreservation of Health proposed the original ca-tegorization of exercises, which can be qualifiedas the precursor of contemporary periodizationfor strength training.''"' His exercises with se-quences from '"exercises with strength but withoutspeed" to developing "speed apart from strengthand force" and, finally, to "intense exercisescombining strength and speed,"'"'astonish us bytheir logic and creativity, although they can bequestioned in the light of contemporary knowl-edge. Another example of annual periodizationcan be found in the essay Gynmasticus of theprominent ancient Greek scientist Philostratus,"the Athenian", who also lived in the second cen-tury AD.''- ' His description of pre-Olympic pre-paration contains a compulsory lO-month periodof purposeful training followed by I month ofcentralized preparation in the city Elis prior tothe Olympic Games. This final part of the annualcycle resembles pre-Olympic training camps prac-ticed by any national squads today. The guide-lines set down by Philostratus, which sequencesmall, medium and large workloads within a4-day training cycle, can serve as a brilliant illus-tration of the ancient approach to short-termplanning.

Ï. }.2 Contemporary Stage of Developing TrainingPeriodization

The foundations of the contemporary theoryof periodization were first proposed in the formerUSSR, where textbooks for coaches and physicaleducation students called for the division of theentire preparation process into separate periodsof general and more specialized training.''-^' Thisseparation into general preparation, encompass-ing training for cardiorespiratory fitness, general

coordination and basic athletic abilities, andspecialized preparation with a focus on sport-specific traits, remains till now. This general ap-proach was adopted in most sports, and earliertextbooks on skiing.''"*' swimming''"^' and trackand field'"'' were written based on these commonlyaccepted approaches. In the 1950s, a number ofphysiological surveys were published,''"*' At thesame time, studies provided serious biologicalbackground support and a scientific basis for theguidelines. However, the first serious summary ofup-to-date scientific and empiric concepts wascompiled by Lev P. MatveyevJ^' making him therecognized founder of the traditional theory oftraining periodization. Actually, training period-ization - meaning "the subdivision of the seasonalprogramme into smaller periods and trainingcycles' - appears to be an iinportant and indis-pensable part of training theory.

1.2 Basic Positions of the Traditional Mode!

The basic positions of the traditional theory oftraining periodization include: (i) a general elu-cidation of load and recovery in view of the super-compensation concept; (ii) general principles ofperiodized training; (iii) the hierarchy of pcriod-ized training cycles; and (iv) proposed variationsof the annual cycle. Let us consider each of thesepositions.

1.2.1 Generalized Concept of load-Recovery'Interaction

Perhaps the first scientifically based explana-tion of fitness enhancement was offered in themid-1950s by Soviet biochemist Yakovlev,'--'''who reported on the supercompensation cycleafter a single workout. The phenomenon of super-compensation is based on the interaction betweenload and recovery (figure I).

The supercompensation cycle is induced by thephysical load, which serves as the stimulus for fur-ther reaction. The single load, which is consideredthe first phase of the cycle, causes fatigue andacute reduction in the athlete's work capability.The second phase is characterized by markedfatigue and a pronounced process of recovery;consequently, towards the end of this phase the

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192 ¡ssurin

Workcapability

1/7

Phases

Fatigue andrecovery

Super-compensation

Return to pre-loadlevel

Fig. 1. The supercompensation cycle, showing the trend of workcapability following a single load.^^'

athlete's work capability increases and reachespre-load levels. During the third phase, workcapability continues to increase, surpassing theprevious level and achieving the climax, whichcorresponds to the supercompensation phase. Inthe fourth phase, work capability returns to thepre-load level.

This load-recovery pattern has been provenusing the depletion and restoration of biochemicalsubstances such as creatine phosphate'"*-'^! orglycogen.f'^"'"' A similar trend was noticed usingvarious physiological estimates'--! and. sport-specific tests.f̂ -̂ -'*' Based on the supercompen-sation theory, Matveyev'-''' proposed a generalscheme of several-load summation. According tothis scheme a number of workouts can be per-formed while the athlete is still fatigued, and thesupercompensation effect can be induced fol-lowing a specific training cycle but not a singleworkout. This position formed the foundationfor compiling small training cycles (microcycles)and designing pre-competition training.

J.2.2 Principles of Periodized Trair^ing

A number of specialized principles were pro-posed by Matveyevf-^1 and popularized in furtherpublications on training theory. One of the basictenets determining the general concept of peri-odized training is the 'principle of cyclical train-ing design'. This principle applies to periodiccycles in athletic training. Over a long period, themany components of long-term training repeat

and return periodically. The rationales for thisapproach pertain to: an habitual rhythm of work-ing days and vacation; the cyclical character ofadaptation that presupposes periodical regenera-tion of adaptability; the sharing of main tasks thatallows the development of general and sport-specific motor abilities, technical and tacticalskills; and the competition schedule, which stronglydetermines the apexes of athletes" preparationand periodic changes in the training programme.

The principle of 'unity of general and specia-lized preparation' emphasized the importance ofspecific workloads during a long period of earlyseason training, and the necessity of generalconditioning workouts within the period of fre-quent competitions. It is worthy of note that thisprinciple was claimed at a time when 'seasonal"impacts were much stronger than they are today.Such sports as skiing, skating, rowing, ice hockeyand soccer were strictly determined by seasonalconditions. Correspondingly, stressing the link-age between general and specialized preparationwas necessary for both methodical and organi-zational reasons.

Another meaningful principle called 'wave-shape design of training workloads" was postu-lated during the 1950s for short-term (weeklyprogramme) and for long-term (annual cycle)planning design. This principle proclaimed theneed to alternate days of high load and lowerload, sequencing large, medium and small work-loads. The physiological sense of this principlewas supported by the outcomes of biochemicaland physiological studies conducted at thattime.t'"*' The findings of post-exercise recupera-tion showed that such sequencing oï work-loads facilitates the probability of favourabletraining responses and the prevention of exces-sive fatigue accumulation. Similarly, the medium-size waves in monthly training and large waves inthe annual training plan were intended to refreshathletes' adaptability and avoid the monotony ofrepetitive training routines.

The 'principle of continuity' was postulatedat a time when interruptions in training wererelatively frequent and excusable. The principleclaimed that such interruptions are very harmfulbiologically, pedagogically and organizationally.

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New Horizons for Training Periodization 193

II also proposed that breaks in training for re-cuperation and social needs should be thoroughlyplanned, whereas sporadic breaks should be to-tally e.xcluded. Nowadays, wilh the majority ofhigh-performance alhletes training at profes-sional and semiprofessional levels, the impor-tance of this principle is still relevant althoughnow it seems quite trivial.

1.2.3 Hierarchy ofPeriodized Training CyclesAs stated in the introduction, the general

concept of periodized training was proposed inthe 1960s and has been adopted by many gen-erations of analysts and coaches {table I).

The upper level of the hierarchical periodizedsystem belongs to multi-year preparation, wherethe Olympic quadrennial cycle is of particularimportance. The next level of the hierarchy is re-presented by the macrocycles, which usually lastI year but can be shortened to half a year andeven less. The macrocycles are divided intotraining periods, which fulfil a key function intraditional theory: they divide the macrocycleinto two major parts, the first for more general-ized and preliminary work (preparatory period).and the second for more event-specific work andcompetitions (competition period). In addition, athird and the shortest period is set aside for activerecovery and rehabilitation. The next two levelsof the Iiierarchy are reserved for the mesocycles(medium-size training cycles) and microcycles

Table I. The blerarchical structure and content o( periodized train-

Preparation componentand Ils duralion

Content

Multi-year preparation(years)

Macrocycle {months)

Mesocycle (weeks)

Microcycle (days)

Workout (h/mIn)

Long-lasting systematic athlete trainingcomposed of 2-year or 4-year(quadrennial) cycles

Large size training cycle (trequenllyannual cycte) that includes preparatory,competition and transition periodsMedium size trair)ing cycle consisting of anumber ot microcyclesSmall size training cycle consisting of anumber of days; frequently 1 weekA single training session that isperformed individually or within a gfojp

(small-size training cycles); the bottom part be-longs to workouts and exercises, which are thebuilding blocks of the entire training system.

Because the periods are the most meaningfulcomponents in the traditional theory, iheir par-ticularities and content are clearly prescribed.The preparatory period programme should con-tain extensive, high volume, diversified exercisesto develop mostly general physical and technicalabilities, whereas the competitive period shouldbe focused on more intensified, specialized ex-ercises of reduced volume, including participa-tion in competitions. The biological backgroundof such a design presupposes a gradual enhance-ment of athletes* adaptability induced by increas-ing training stimulation.

J.2.4 Variations of the Traditional AnnualCycle Model

The earlier versions of periodized plans wereoriented to macrocycles lasting an entire season.Such a planning approach can be defined as a"one-peak annual plan". In the early 1960s,such a design corresponded to many seasonalsports such as rowing, cycling, skating and skiing.The appearance of various sport facilities and thegeneral progress of sporl made it necessary toexpand competitive practice. Thus, the one-peakannual design became insufficient and 'two-peakannual plans' were introduced. However, furtherprogress in sport facilities, diversification ofcompetitions and increased professionalism oftraining led to the elaboration of 'three-peakpreparation models".'-''•-'^' which became the lastcommonly recognized modification of traditionalperiodization (figure 2).

1.3 Major Limitations of TraditionalPeriodization

Although the traditional model proposes asequencing of different targets (from general tospecific; from extensive to more intensive work,etc.), the predominant methodical approach ispredicated on the simultaneous development ofmany targeted abilities. For instance, preparatoryperiod training for high-performance athleles inendurance, combat sports, ball games and aes-thetic sports usually contains a programme for

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194 Issurin

Transition periodCompetition periodPreparatory period

Fig. 2. One-peak, two-peak and three-peak annual cycles, displaying the annual trend of athletic results related to the seasonal bestachievement.

the development of general aerobic ability, mus-cle strength and strength endurance, improve-ment of general coordination, general explosiveability and general speed, basic mental and tech-nical preparation, mastery of the tactical repertory,treatment of previous injuries, etc. Each of thesetargets requires specific pbysioIogicaK morpho-logical and psychological adaptation, and manyof these workloads are not compatible, causingconflicting responses. These disadvantages of thetraditional model may be negligible for low-levelathletes, where a complex mixed programmemakes training more attractive and entertaining.However, for high-performance athletes the limit-ations of traditional periodization raise seriousobstacles to further progress {table II).

Obviously, these limitations substantially de-crease the quality of training. Unlike novices andmedium-level athletes, who require relatively lowtraining stitnulation to progress, high-performanceathletes enhance their preparedness and perfor-mance through large amounts of training stimulithat can hardly be obtained using traditionalmulti-targeted mixed training.

One additional drawback of the traditionalmodel is its inability to enable athletes to parti-

cipate successfully in many competitions. Thetraditional periodization proposes one-, two- andthree-peak designs, where the annual cycle con-sists of one, two or three macrocycles.'-**"-*'' How-ever, even the three-peak design does not satisfythe international sport trend towards competi-tions throughout the year. The multi-peak ten-dency of modern top-level sport is in obviouscontradiction to traditional periodizationJ^**! Allof these circumstances and factors contributed tothe search for alternative training approaches,which were offered by creative coaches and sci-entists and are considered below.

2. Alternative Models of Periodization

The initial impetus to reform traditional peri-odization first began among prominent coachesin different sports when they saw that the instruc-tions for training management restricted theircreativity and didn't allow their athletes lo attaintheir highest achievements. Attempts to improvethe traditional model were cosmetic in characterat first; however, in tbe early 1980s, reformationtendencies became stronger. The most influentialfactors evincing this revision were the substantial

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Now Horizons for Training Periodization 195

changes occurring at that lime in world sport andathletic training.

2,1 Factors Affecting the Revision ofTraditional Periodizotion

A number of factors effected a reformation ofIhe traditional training system and encouraged asearch for alternative approaches. These factorsincluded limitations of traditional periodizationin terms of the concurrent development of severalmotor and technical abilities (table II), and dra-matic changes in world sport in recent decades.

F.vidently, the tremendous changes in worldsport over recent decades had a strong influenceon the evolution of the training process. Despiteihe uniqueness of each sport, these changes ap-peared to have an overall tendeney worldwide,with a number of main characteristics.• An increase in the total number of competi-

tions:^-'^-^\ correspondingly, their contributionto training stimuli has increased dramatically.

• Financial motivation of top athletes, whichbecame much stronger than previously.

• Clo.ser coopera I ion and sharing among worldcoaches, which led to enhancement of trainingquality and level of athletic performances.

• The struggle against illegal pharmacologiealintervcntion.s. which affected and which led tothe prevention of such harmful technologies inhigh-performance sport.'''^l

• ¡mplcmentation ofadvamcil .sport technologiesand training methods such as monitoring of

heart rate, blood lactate, movement rate.ç(j, .[35.46] improvement of medical follow-upmethods;'''̂ '***! and elaboration of advancedtraining equipment atid new materials.I"*" •''!These advances, combined with increased

sharing of successful planning approaches amongcoaches, have spurred tremendous progress intraining methodology.

2.2 Periodization Charts in Team Sports

It has been widely acknowledged for sometime that preparation planning in team sportsdiffers drastically from planning routines in in-dividual athletic disciplines. Several surveys ofteam sports report the adoption of periodizedmodels of the traditional concept.''̂ -•^^1 However,many recent publications declare that basingtraining programmes on the "classic model' ofperiodization is counterproduetive for most teamsports.t'̂ '*''̂ ]̂ The playing season for team sportslike football, rugby, basketball, ice hockey, etc. lasts20-35 weeks in Europe and North America.''''̂ • '̂̂ lIt has been shown that a training design followingtraditional planning precepts leads to dramaticreductions in lean body massj** '̂ maximal strengthof relevant muscle groupsp"-^* '̂ maximal anaerobicpower'*""! and even maximal speed.'*'''

Application of the traditional model is stillrealistic for junior and low-level athletes, whosecompetition phases are relatively short and canbe considered similar to tbose of individualsports. However, to consider the playing season

Table II. Major limitations of traditional periodization tor training high-performance athletes

Factor Limitations

Energy suppiy

Ceiiuiar adaptation

Post-exercise recovery

Compatibiiity of variousworkloads

Mental concentration

Sufficiency of training stimuli for

progress

Competitive activity

Lack of sufficient energy suppiy for concurrent performance of diversified workloads'^^'^'

Training consequences such as mitochondrial biogenesis, synthesis of myofibril proteins and synthesis ofanaerobic enzymes presuppose separate pathways of bioiogical adaptation'^'"^^

Because different physiological systems require different periods of recuperation, athletes do not get' l

Exercises combining various modalities often interact negatively due to energy deficit, technical complexityand/or neuromuscular fatigue'""^^'

Perfonnance of stressed workloads demands high levels of mental concentration that cannot be directed atmany targets simultaneously!""'"!

Sport-specific progress of high-level athletes demands large amounts of training stimuli that cannot beobtained by concurrent training for many targets'^'*''^'

Inability to provide multi-peak preparation and successful performances during the entire annual cycle'^''*^'

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196 Issurin

Off-season

ARMCGS

Pre-season

Í P̂ 1SSSP

MS

l SSE J

In-season

f \MCTTSSSE

^ )

Post-seasonbreak

ARPR

3-4weeks

6-20weeks

15-35 weeks1-4

weeks

Fig. 3. Schemalic presenlatbn of an annual preparation chart inleam sportsJ'"''"'''' AR = active recovery; GS = general strength;MC = metabolic conditioning; MS = maximal speed; PR ̂ psychologicalrecovery; SSE = sport-speciftc endurance; SSSP = sport-speciftcstrength ar>d power; TP=technigue perfection; TTS = lectino-taottcalskills.

of qualified athletes from the viewpoint of tradi-tional periodization leads to an absurd situationin which the climax phase of annual preparationconsists of 20-30 competitive microcycles. In thissituation the generalized concepts of peaking andtapei ing make no sense. Perhaps this is one of thereasons that many experts in team sports avoidutilizing traditional terms such as preparatoryand competition periods and use team sport-specific terms like 'off-season', 'pre-season' and'in-season' training.'''*'*'"'

A general presentation of the annual cycle forqualified players specifies the relevant phases oftheir preparation in terms of duration, dominanttraining targets and load level (figure 3). Ofcourse, because of the variation among teamsports, national competition calendars and theparticularities of training for different agegroups, it is impossible to compile a universalchart model. It can be suggested that training inoff-season and pre-season phases can resembletraining in the traditional periodization ap-proach.f""*' A careful inspection of the prepara-tion programmes proposed for high-performanceplayers reveals that even this is highly restricted.Indeed, the traditional model facilitates the ac-quisition of an optimal combination of all sport-specific abilities to ensure peak performances for

a limited number of days, whereas rational pre-paration planning in team sports presupposes themaintenance of sport-specific preparedness over4- to 8-month periods.

From a physiological viewpoint, the im-portance of rationally periodized training in teamsports cannot be underestimated. The long play-ing season with its large number of stressfulgames frequently leads to hamiful consequencessuch as pronounced catabolic responses,'*''-^*!musculoskeletal disorders and a high incidence ofinjuries.'̂ *"' Reasonably structured training thaiavoids conflicting physiological responses facil-itates the beneficial maintenance of sport-specificpreparedness and prevents a decline in relevantphysiological capabilities and traits.'''^•^-''^^

2.3 Linear and Non-Linear Periodization

Attempts to reform and rationalize traditionalperiodization were undertaken by several re-searchers and training analysts. Their intentionwas to update the traditional model and to dis-tinguish between so-called 'linear' and 'non-linear'periodization.''^''-''''' Proponents of the revisedversion proceeded from the assumption that tra-ditional periodization postulates a gradual pro-gressive increase in intensity and can therefore betermed a linear model. In contrast, the non-linearmodel offers drastic variations of intensity withinthe weekly and daily programme. This 'variationfactor" was especially emphasized in the term"undulating periodization''*'''' that was attachedto the non-linear model. In reality, traditionalperiodization does not ignore - and even requires- wave-shaped fluctuations of workloads withinthe single-day, micro- and mesocycles; it alsodoes not restrict the amplitude of these varia-tions. Moreover, the principle of wave-shapetraining design emphasizes the importance of thisvariation factor (see section 1.2.2). This incon-sistency oí the proposed concept was noted byStone and co-authors.''''*'''*' Apparently the tra-ditional model is both 'non-linear' and 'undulat-ing', whereas the 'linear model' looks extrcmehartificial and contradicts general physiologicaland methodic demands. The opponents of this con-cept correctly declared that the use of terminolog\

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Horizons for Training Periodization 197

such as 'linear* and 'non-linear' is mislead-ing.'^"' The author completely supports thisposition and assumes that such is the case whenan attempt is made to attach non-traditionalterms to well known traditional trainingapproaches.

2.4 Non-Traditional Models of Training Design

.\s noted in sections 2.1. 2.2 and 2.3. the al-ternatives to traditional periodization modelswere created both by practitioners (prominentcoaches and athletes) and scientists. This sectionpresents examples of such alternatives.

2.4.1 Anr^ual Performance Trends of Great AthletesOne of the typical characteristics of con-

temporary high-performance sport is multi-peakpreparation for attaining excellent resultsthroughout a season, and not two to three timesas in traditional periodization. The examples ofworld-leading athletes from individual sportsdemonstrate incredible stability in peak perfor-mances at relatively short intervals {14-43 days)between peaksj'*^-'"' The diagram in figure 4 dis-plays the annual performance trend of one of thegreatest track and field athletes. Sergei Bubka(USSR Isince 1991 Ukraine]), who earned anOlympic gold medal in 1988 and five WorldChampionship gold medals in pole vault. Hisworld record (614 cm) stands to this day.

620-1

610 •

„ 600-

= 590-

580-

570-

560Jan Feb Mar Apr May Jun Jul Aug Sep

Fig. 4. The annual pole vault performance trend o( Sergei Bubka inthe 1991 season.12«!

The graph indicates six peaks where the athleteobtained 12 results higher than 590 cm that cor-responds to the result of the winner at the 2009World Championship. A brief analysis of thisathlete's annual performance trend reveals thefollowing characteristics about his personalmodel of periodized training.

During a period of about 250 days, SergeiBubka took part in a long series of competitions;this period was preceded by pre-season prepara-tion that lasted about 3 months, during whichtime he did not take part in official tournaments.During a period of 9 months the athlete took partin a number of competitions and his resultsranged from 92% to 100% of personal best; this ex-tensive competitive practice provided the athletewith very strong training stimuli. The intervalsbetween peak performances varied from 12 to 43days (usually 22-27); this time span was sufficientfor active recovery but absolutely unrealistic inorder to fulfil any periods of the generalizedpreparation as proposed in traditional period-ization.'-''-^^' It is obvious that this long timespan (9 months) during which the athlete suc-cessfully competed at the world-class level cannotbe subdivided into traditional preparatory andcompetition periods. On the other hand, theathlete's basic abilities (maximal strength,aerobic regeneration capacity) needed to bemaintained at a sufficient level. Therefore, theappropriate short-term training cycles for basicabilities and recovery were incorporated into hisprogramme.

Of course. Sergei Bubka is a unique athlete,but the example of his preparation is typical forcontemporary high-performance sport, as can beseen by similar examples for other great ath-letes.'** '̂̂ '' Obviously, the traditional scheme doesnot provide such a multi-peak preparation de-sign, and great athletes and their coaches had tofind their own periodization models as alter-natives to the traditional approach.

2.4.2 Concentrated Unidlrectlonaf Trainir}g Ptans

The concept oï concentrated unidircctit)naltraining was proposed by Verchoshansky''-^'for preparation in the power disciplines. Thistraining design was tested during preparation of

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198 Issítriii

high jumpers, who executed a 4-vi'eek mesocycleof highly concentrated strength training followedby a restitution mesocycle lasting 2 weeks duringwhich the athletes focused on perfecting technicalskills, speed exercises and general fitness training.During the first loading mesocycle the relevantstrength indicators decreased gradually; how-ever, during the subsequent restitution mesocyclethese indices increased to a higher level than hadbeen recorded prior to the training programme.The author recommends repeating this combi-nation of loading and restitution mesocyclesduring the annual cycle. The gains obtained instrength and power can be explained as part ofthe long-lasting delayed effect (LLDE), which is asubject deserving special consideration. The au-thor claims that LLDE is conditioned by highlyconcentrated, large-volume workloads during thefirst phase, and reduced workloads in the secondphase.''-^1 The concept presupposes that the lowerthe decrease the functional indices move in thefirst phase, the higher they will increase in thesecond phase; the duration of the first phasevaries in duration from 4 to 12 weeks. Corre-spondingly, a similar time span is expected forpositive after-effects following this concentratedtraining.

The idea of concentrated unidirectional train-ing has been discussed extensively in the litera-turej^'*"^^' and was transferred from the powerdisciplines to other sports, specifically in a long-term study of qualified adult basketball play-ers.f̂ *"' The annual cycle was subdivided into twomacrocycles lasting 23 and 19 weeks. Each mac-rocycle consisted of three stages: (i) a loadingphase of strength and power workloads (8 and 3weeks, respectively); (ii) a restitution phase (2 and3 weeks, respectively); and (iii) a competitionstage, where the players took part in regionalchampionship (13 weeks in both cases). The ex-perimental group, which had no control coun-terpart, significanlly enhanced results in powertests, and their dynamics corresponded to thetrend proposed by the LLDE concept. Unfortu-nately, the authors did not report the results ofthe athletes in the basketball tournament, whichwas definitely the team's first priority. It can besuggested that a reduction of functional back-

ground during prolonged loading phases canhave a deleterious effect on sport-specific pre-paredness and reduce the effectiveness of teampractice.

In conclusion, it is worth noting that perfor-mances in most sports require manifestations otmultiple physical and technical abilities. Thisdefinitely restricts application of the unidirec-tional training concept lo the actual design ofpreparation programmes.

3. Block Periodization as an AlternativeApproach to High-Performance Training

In the early 1980s., the term "training blocks"became popular and widely used among high-performance coaches. Of course, it was not conceptualized initially and was found mostly incoaches* jargon. Nevertheless, in its most comprehensive connotation it referred to "a trainingcycle of highly concentrated specialized work-loads."'•'^1 Such cycles contain a large volumeof exercises directed at a minimal number oftargeted abilities. As a planning approach, train-ing blocks seemed an alternative to traditionalmulti-targeted mixed training, which was underextensive criticism by creative coaches and re-searchers. Gradually, successful attempts to im-plement training blocks led to the appearance of apreparation system called 'block periodization".As a new methodological approach, block peri-odization has been dealt with in several publica-tions, which are considered below.

3.1 Earliest Efforts to Implement BlockPeriodization

It can be suggested that the first attempts toimplement training blocks in practice were notdocumented and survive mostly from anecdotalreports. However, at least three successful ex-periences in block-periodized training were sys-tematized and published.

One of the pioneers in reforming traditionaiperiodization was Dr Anatoly Bondarchuk,who coached the gold, silver and bronze medalwinners in the hammer throw at the 1988 and1992 Olympic Games and many other top-level

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New Horizons for Training Periixiization 199

aliiletes. The system be created comprised threetypes of properly specialized mesocycle blocks:developmental blocks, in which workload levelsgradually increase to maximum: competitiveblocks, in which the load level is stabilized andathletes focus on competitive performance; andrestoration blocks, in which athletes utilize activerecovery and prepare for the next developmentalprogramme. The sequencing and timing of theseblocks depends on the competition schedule andon individual athlete's responses.'"-^^f

A similar block-periodized model was pro-posed and implemented in the preparation of top-level canoe-kayak paddlersJ^**' Three types ofmesocycle biocks were elucidated: accumulation.,which was devoted to developing basic abilitiessuch as general aerobic endurance, muscle strength,and general movement techniques; transforma-tion, which focused on deveioping more speci-fic abilities like combined aerobic-anaerobic oranaerobic endurance, specialized muscle endurance,and proper event-specific technique; and realiza-tion, which was designed as a pre-competitivetraining phase and focused mainly on race mod-elling, obtaining maximal speed and recoveryprior to the forthcoming competition. Thesethree mesocycles were combined into a separatetraining stage, lasting 6-10 weeks, which endedwith competition; a number of training stagesformed the annual macrocycle. The radically re-formed preparation programmes resulted in out-standing performances of the USSR nationalcanoe-kayak team, who earned three gold andthree silver medals in the 1988 Seoul OlympicGames and eight and nine gold medals in tbeWorld Championships of 1989 and 1990,respectively.l*^*''

One more successful experiment with tbisapproach was conducted by world-renownedswimming expert Gennadi Touretski. who coa-ched Alexander Popov (Russia) - five-timeOlympic Champion and multiple World andHuropean champion - and Michael Klim(Australia) - two-time Olympic champion, multipleWorld champion and medal winner. Touretskisubdivided the annual cycle into a number ofstages lasting 6-12 weeks, where each onecomprised four training blocks in the follow-

ing sequence: preparation, general, specific andcompetitive.^'^^^ Later, the author modified thistaxonomy and called them tbe general block,wbicb focused on aerobic and varied co-ordinative workloads, the specific block, whichwas devoted to developing event-specific en-ergetic mechanisms and competitive speed, andthe competitive Nock, which corresponds to whattoday is commonly called 'tapering', and culmi-nates with competition.'**-' This stage is usuallyfollowed by a short recovery cycle.

Despite the obvious uniqueness of each sportin which tbese experiments were undertaken, theprincipai methodological demands of trainingwere almost identical:• The authors created training blocks in wbich

workloads focus on a minimal number oftargets.

• The total number of proposed blocks isrelatively small (three to four). This is in con-trast to tbe traditional theory, in wbich themesocycle taxonomy includes 9-11 types.l**"*'-^

• The duration of a single mesocycle blockranges from 2 to 4 weeks, wbicb allows thedesired biochemical, morphological and co-ordinative changes to occur without excessivefatigue accumulation.

• The joining of single mesocycles forms atraining stage: their correct sequencing isbeneficial to competitive performance, i.e.peaking.

3.2 Scientific Concepts Affecting theBiock-Periodized Modei

At least two contemporary scientific conceptsbad a distinct impact on the establishment of theblock periodization preparation system: the cu-mulative training effect and the residual trainingeffect.

3.2. / Cumulative Training EffectIn terms of competitive sport, the cumulative

effect of long-term training is the primary factorthat, to a great extent, determines an athlete'ssuccess. The cumulative training effect can be ex-pressed as "changes in physiological capabilitiesand level of physical/technical abilities resultingfrom a long-lasting athletic preparation."'^"^'

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200 Issurui

Correspondingly it can be reflected by twogroups of indicators: (i) physiological and bio-chemical variables, which characterize changes inthe athlete's biological status; and (ii) variables ofsport-specific abilities and athletic performance.which characterize changes in the athlete'spreparedness.

The functional limits of the various physio-logical systems cannot be increased to the sameextent, and different physiological indicators ofcumulative training effects vary within their ap-propriate range. The most pronounced changescan be obtained in aerobic abilities. More speci-fically, purposeful endurance training can dra-matically increase aerobic enzymes, the numberof mitochondria, myoglobin content and musclecapillarization.l'^-'*^''' Unlike aerobic ability de-terminants, the characteristics of anaerobic me-tabolism can be improved to a lesser extent. Thisapplies to anaerobic enzymes and particularly topeak blood lactate and creatine phosphate sto-rage, with increases that are relatively small evenwhen training is highly intensive.t̂ ^-^^^

Cumulative training effects attained in varioussport-specific abilities strongly depend on changesin the physiological variables mentioned above.Thus, the improvement rate in aerobic endurancedisciplines is much higher than in events de-manding maximal anaerobic power and capacity.Gains in maximal strength are determined bychanges in the musculoskeletal system and theneural contraction mechanism.t'^'''

Managing the cumulative training effect pre-supposes the planning and regulation of work-loads over relatively long periods, which involvescompetence in training periodization. The con-cept of cumulative training effect is extremelyimportant for both traditional and block peri-odization models, although the usual trend ofphysiological and sport-specific variables differsin each alternative system. Multi-targeted mixedtraining, typical of the traditional model, causesan increase in basic athletic abilities in the pre-paratory period followed by their decline in thesubsequent competition period, whereas thesport-specific abilities are suppressed in the pro-longed preparatory period and increase duringthe competition period. The block periodization

system with its multi-peak preparation allowsathletes to maintain both basic and sport-speciilcabilities in a relatively narrow range during theentire season,[^'-"1

3.2.2 Residual Training Effect

The residual training effect concept ¡s rela-tively new and is less known than other types oftraining outcomes. Long-lasting training is in-tended to develop many motor abilities, whichremain at a heightened level for a given perioilafter training cessation. This retention belongs toanother special type of training effect called the"residual training effect', which can be char-acterized as "the retention of changes induced bysystematic workloads beyond a certain time pe-riod after the cessation of training."'-*^'

The general approach to 'training residuals'induced by 'residual effects of training" wasconceptualized initially by Brian and JamesCounsilman.l*^**^ and focused mainly on the long-term aspects of biological adaptation. They logicallyproposed the existence of long-lasting trainingresiduals as an important background element oftraining theory. From the viewpoint of generaladaptation and long-lasting sport preparation,long-term training residuals are very important.However, for designing training programmes,short-term training residuals are of primaryimportance.

The phenomenology of the residual trainingeffect is closely connected with the process ol'de-training, which may occur selectively accordingto specific abilities when they are not stimulatedby sufficient training.'^'*''"' When training is designedin the traditional manner and many abilities aredeveloped simultaneously, the risk of de-trainingis negligible because each target (given physicalor technical abilities) receives some portion of Ihestimuli. However, if these abilities are developedconsecutively, as proposed by the block period-ization system, the problem of de-training be-comes important. Indeed, if an athlete developsone ability and loses another one at the sametime, the coach should take into account theduration of the positive eflect of a given type oftraining after its cessation and how fast the ath-lete will lose the attained ability ievel when he/she

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New Horizons for Training Periodization 201

Table III. Factors affecting the duration of short-term training residuals'^'

Factor Influence

1. Duration o( training before cessation

2 Load concentration iBvel of training beforecessation

3. Age and duration ot sport career of athletes

4. Character of preparation after cessation ofconcentrated training

5. Biological nature of developing abilities

Longer training causes longer residuals

Highly concentrated training compared with complex multi-component training causes

shorter residuals

Older and more experienced athletes have longer residuals

Use of appropriate stimulatory loads allows prolonged residuals and prevents fast de-training

Abilities associated with pronounced morphological and biochemical changes like musclestrength and aerobic endurance have longer residuals; anaerobic alactic and glycoliticabilities have shorter residuals

stops training for it. In other words, the coach hasto know the residual effect of each type of train-ing. The duration of training residuals variesdepending on several methodological and phy-siological factors (table HI).

It can be concluded that the prediction, eva-luation and programming of cumulative and re-sidual training effects appear to be meaningfuland even indispensable components of block-periodized preparation.

3.3 Basic Positions of Block-Periodized Training

The basic positions of block-periodized train-ing contain: (i) general principles; (ii) a taxonomyof mesocycle blocks; and (iii) guidelines forcompiling an annual plan.

3.3.} Basic Principles

The principles articulate the general idea ofblock periodization and summarize the outcomesof previous studies (table IV).!^'-^'"''^'

The first and most crucial basic principle callsfor a high concentration of training workloadswithin a given block. This means directing a largenumber of exercises and tasks to selected targetabilities while others are not subjected to train-ing stimulation. Of course, such a highly con-centrated training programme is possible only fora minimal number of athletic abilities. In realitythis leads to theallocationof 60-70% of the entiretime budget to developing two to three targets,with the remaining time spent on restoration,warming up and cooling down. This importantfeature is declared in the second principle, whichpostulates a minimization of the number of target

abilities within a single block (the alternative iscomplex mixed training in which many abilitiesare developed simultaneously). Furthermore, in amajority of sports, the number of decisive sport-specific abilities exceeds the number of abilitiesthat can be trained simultaneously in a block withhighly concentrated workloads. Thus, the thirdprinciple proposes that consecutive developmentis the only possible approach for training designin a block periodization system. Finally, thefourth principle demands implementation of anappropriate taxonomy of mesocycle blocks,which allows for structuring the preparation andcompiling block-periodized programmes (seesection 3.3.2). Therefore, medium-sized trainingcycles, called mesocycle blocks, are the mostprominent embodiment of the block period-ization concept in general.

3.3.2 Taxonomy of Mesocycie Blocks

It is easy to see that the proposed generalprinciples lead ultimately to a taxonomy of meso-cycle blocks, which serves the practical needs ofcompiling training programmes.

The "taxonomy of mesocycie blocks', as al-ready mentioned, is formed from three specia-lized types: (i) accumulation, (ü) transmutation,and (iii) realization. The first type is devoted todeveloping basic abilities such as general aerobicendurance and cardiorespiratory fitness, mus-cular strength and basic coordination. This meso-cycle is characterized by relatively high volumeand reduced intensity of workloads. Its dura-tion varies from 2 to 6 weeks. The second typefocuses on sport-specific abilities like special(aerobic-anaerobic or glycoiitic) endurance, strength

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202 Issurin

Table IV. Basic principles ot block periodization

Basic principles Comments

High concentration ot training workloads

Minimal number of target abilities within a

single block

Consecutive development ot manyabilities

Compilation and use of specializedmesocycie blocks

Provides sufficient training stimulation for high-pertormance athletes

Necessafy to provide highly concentrated training stimulation

Usually the number of decisive abilities exceeds the number of abilities developed within a singleblock

Specialized mesocycie bbcks - i.e. accumulation, transmutation and realiiation - form Ihe contentof block periodization training

endurance, proper technique and tactics; this isthe most exhausting training cycle and usuallylasts about 2-4 weeks. The third type is intendedto restore the athletes and prepare them for theforthcoming competition. It contains drills formodelling competitive performance and a sport-specific programme for quick active recovery.This ranges from 8 to 15 days.f̂ ''̂

Joining three mesocycie blocks forms a singletraining stage that concludes with a specificcompetition. Unlike traditional periodization, inwhich the mixed training programme is intendedto develop many abilities, the consecutive devel-opment of targeted abilities typical of block per-iodization produces training stimuli for severalfunctions, while the other abilities decrease. Inthis view, the duration of residual training effectsbecomes of primary importance. The correct se-quencing of the mesocycles within the trainingstage makes it possible to obtain "optimal super-position of residual training effects",'^ •'' so as toallow competitive performance at a high level forall motor and technical abilities. This possibilityarises because the training residuals of basicabilities last much longer than the residuals ofmore specific abilities, while the residuals ofmaximal speed and event-specific readiness arethe shortest.i^ '̂̂ "*' Thus., the total length of a sin-gle training stage ranges from 5 to 10 weeks,depending on competition frequency and sport-specific factors.

3.3.3 Compiiing an Annual Cycte

Based on the above, designing an annual cyclecan be viewed as a sequence of more or less au-tonomous stages, where similar aims are attainedby means of partially renewed and qualitativelyimproved training programmes. A test battery

repeated at each stage together with competitiveperformance results will help to monitor thetraining process and provide feedback that canbe used for ongoing evaluation and programmerectification. Finally, the number of training stagesin an annual cycle depends on the particularitiesof a given sport, its calendar of important com-petitions, etc.. and usually varies from four toseven stages. The typical annual cycle of block-periodized training is shown in figure 5.

The temporal structure of the annual plan isformed first of all by the chronology of thetraining stages. These stages arc determined bythe schedule of mandatory and targeted compe-titions and by the possible duration of severalmesocycie blocks. Thus, training stage durationvaries from 3 months (usually in early season) to25 days (usually late in the season, depending onthe frequency of mandatory competitions). Basedon the general demands of the training stagechronology, additional competitions, trainingcamps and medical examinations can be initiated.

Generally speaking, when coaches compileannual plans they face a dilemma; the liberal"easy' plan will not lead to success, but thestrenuous ambitious programme can engenderexcessive fatigue and be followed by failure.Viewed in this way, the block-periodized designhas obvious benefits. Because of the similarity ofsequential stages, coaches can formulate the planof subsequent blocks based on feedback from theprevious stage of training. The most stressfulphases of work - i.e. the transmutation meso-cycles - can be shortened, lengthened or modifiedafter changes in the athletes' responses. In thelead-up to a targeted competition, coaches canreview the tapering programme two to three-times and approve the most favourable version.

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New Horizons for Training Peritxiization 203

v^

Targeiedevent

Preparation periodCompetition period

Fig. 5. Schematic chart of a block-periodized annual cycle. The importance of competitiohs is depicted in reference points ranging from 1 (thelowest level) to 5 (targeted competition).i**''^l

4. Conclusions

The challenge oí this paper was to introduce[raining periodization by citing the early effortsof the pioneers and trying to present its mostup-to-date versions by summarizing recently in-troduced concepts and evidence. An indispens-able part of the theory of athletes' preparation,training periodization encompasses both aca-demic elements {generalized biological concepts,physiological background, theory of training)atid practically oriented subjects (alternativecoaching concepts, implementation of trainingblocks, etc.). which are equally important. Thelong history of traditional training periodizationindicates its staying power as one of the mostconservative scholastic components of trainingtheory. The five decades in which training peri-odization has been used have been enough todemonstrate the merits and weaknesses of thetraditional model. Its benefits derive from a morereasonable structuring of long-term preparation,whereas its drawbacks emerge from the conflict-ing responses produced by multi-targeted mixed

training (table II). The non-traditional model,called 'block periodization'. proposes a re-vamped training .system, where the sequencing ofmesocycle blocks exploits the favourable inter-action of cumulative and residual training effects.

Acknowledgements

No sources of funding were used to assist in the prepara-tion of this review. The author has no conflicls of interest Ihatare directlv relevant lo the conlent of Ihis review.

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Correspondence: Professor Vladintir B. Issurin, Elite SpnrlDepartment, Wingate Institute, Wingate Post Office,Netanya 42902, Israel.E-mail; v issunn@hotmail.com

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