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Effect of chocolate milk consumption onmarkers of muscle
recovery following
soccer training:
a randomized cross-over study
Ni Made Dwi Asti Lestari
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Abstract
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B ackground : The efficacy of chocolate milk (CM) as arecovery
beverage following a period of increased training
duration (ITD) was studied in intercollegiate soccer
players.Methods: 13 subjects completed one week of normal'baseline'
training followed by four days of ITD. After eachday of ITD,
subjects received either a high-carbohydrate (504
kcal; CHO: 122 g; 2 g Fat) or isocaloric CM (504 kcal; 84 gCHO;
28 g Pro; 7 g Fat) recovery beverage. Serum creatinekinase (CK),
myoglobin (Mb), muscle soreness, fatigueratings and isometric
quadriceps force (MVC) were obtainedprior to ITD, and following 2-
and 4-days of ITD. Performancetests (Tdrill, vertical jump) were
performed within trainingsessions. Treatments were administered in
a randomlycounterbalanced protocol, and subjects repeated
theprocedures with the alternate beverage following a two-week
washout period.
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Conclusions: Post-exercise CM provided similar muscle
recovery responses to an isocaloric CHO beverageduring fourdays
of ITD. Future studies should investigateif the attenuated CK
levels observed with CM havefunctional significance during more
demanding periods of training.
Results: Mean daily training time and HR increased (p 25%typical
training :types/amounts
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Physiological Measurements
Measurements
Muscle SorenessRatings
Mental and PhysicalFatigue Ratings
using a 100 mm visualanalog scale
using Part II of the Mental and Physical State and Trait Energy
and Fatigue Scales (MPSTEFS)
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Performance Measurements
conducted on the dates indicatedduring the ITD periods.
Modified pro-agilitytest (T-drill):
Vertical jump test:
measured using a Vertec
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Treatments and Dietary Controls
subjects consumed one of two recovery treatment
Beverages were consumedwithin 5 minutes of completionof each
exercise session.
ITD Period:
not to consume any other nutrients for 2-hours followingeach
training session.
analyzed by FoodWise software
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Statistical Analysis
using SPSS version 17.0
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R esu l ts
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Serum CK levels rose
significantly followingPreITD, and CK wassignificantly different
betweentreatments at the Post4 time-point
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No significant differences wereobserved between
treatmentperiods
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D iscussion
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Training programs : activities of varying intensities
plyometric exercises such asvertical jumping
increased muscle soreness,elevated blood CK levelsimpaired
performance
nutritioninterventions
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Cade et al.and Luden et
al
lower plasma CK levels with CHO+Proingestion over the course of
multiple days of training in free-living swimmers and runners,
respectively.
Previous Study
That CHO+Pro ingestion improved musclefunction versus CHO and
placebo beverages
following heavy endurance exercise.
Valentine et
al.compared three recovery beverages consumedfollowing a
glycogen-depleting session of cycling intervals
Karpet al.
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Present study
serum CK levels were significantly lower following four days of
ITD with CM supplementation versus CHOsupplementation.
MVC over the four days of ITD were slightly greater withCM
ingestion (53 75 N) than with CHO
Isocaloric CHO and CM beverages provide similar effectson whole
body exercise recovery during short periods of heavy soccer
training
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NCAA regulation limiting out-of-season practice
time to a maximum of 8 hrs per week of 'athleticallyrelated
activities' it was not possible to implement anITD period greater
than 4 days in the present study.
Limitation
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C onc lusions
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Post-exercise CM provided similar muscle recoveryresponses to an
isocaloric CHO beverage duringfourdays of ITD.
Future studies should investigate if the attenuated CKlevels
observed with CM have functional significanceduring more demanding
periods of training.
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