Ch8 (139 164)

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  • 1. 8 C H A P T E R Physiological Adaptationsto Anaerobic and Aerobic Endurance Training Programs William J. Kraemer

2. Chapter Outline Anaerobic training Detraining Endocrine responses to anaerobic and aerobic exercise Aerobic endurance exercise training Overtraining 3. P erformancegains typically are related to changes in more than one physiological system. The training program must train each physiological system in careful balance with specific performance goals in mind. 4. Key Concepts of Physiological Adaptations to Exercise Training Each person responds differently to each training program. There is a psychological component to training. The magnitude of the physiological or performance gain is related to the size of an athletes adaptational window. The amount of physiological adaptation depends on the effectiveness of the exercise prescriptions used in the training program. Training for peak athletic performance is different from training for optimal health and fitness. 5. Relationship Between Energy Delivery Systems and Exercise Duration 6. Anaerobic Training:Two Primary Energy Systems The phosphagen system provides immediate ATP energy for fast and powerful movements. This system is used during short-duration, high-intensity activities with long rest periods. The glycolytic system breaks down glucose to lactic acid and is the next most readily available source of ATP. This system is used during longer, less intense exercise with shorter rest periods. The oxidative system also plays a role in maintaining power output and recovering energy stores. 7. Table 8.2Comparison of Physiological Adaptations to Resistance Training and Aerobic Endurance Training (continued) Variable Results following Results following aerobic resistance training endurance training Performance Muscle strength Increases No change Muscle endurance Increases for high power Increases for low power output output Aerobic power No change or increases Increases slightly Maximal rate of Increases No change or decreases force production Vertical jump Ability increases Ability unchanged Anaerobic power Increases No change Sprint speed Improves No change or improves slightly 8. Table 8.2(continued) (continued) Variable Results following Results following aerobic resistance training endurance training Muscle fibers Fiber size Increases No change or increasesslightly Capillary density No change or decreases Increases Mitochondrial Decreases Increases densityFast heavy-chain Increases in amount No change or decreases myosin in amount Type II muscle Almost all to Type IIa With spring interval, a fiber subtypemajority to Type IIa conversion 9. Table 8.2(continued) (continued) Variable Results following Results following aerobic resistance training endurance training Enzyme activity CreatineIncreases Increases phosphokinaseMyokinase Increases Increases Phospho- Increases Variable fructokinaseLactate No change or variable Variable dehydrogenase 10. Table 8.2(continued) (continued) Variable Results following Results following aerobic resistance training endurance training Metabolic energy stores Stored ATP Increases Increases Stored creatine Increases Increases phosphate Stored glycogen Increases IncreasesStoredMay increase Increases triglycerides 11. Table 8.2(continued) Variable Results following Results following aerobic resistance training endurance training Connective tissue Ligament strength May increase Increases Tendon strength May increase Increases Collagen content May increase VariableBone density No change or increases No change or increases Body composition % body fat Decreases Decreases Fat-free mass Increases No change 12. Graphic Representation of the Size Principle 13. W ithheavy resistance training, all muscle fibers get bigger because they are all recruited in consecutive order by their size to produce high levels of force. In advanced lifters, the central nervous system might adapt by allowing these athletes to recruit some motor units not in consecutive order, but by recruiting larger ones first to help with greater production of power or speed in a movement. 14. Changes in Muscle Fiber Subtypes 15. RM Continuum of Training Effects 16. Theoretical Interplay Between Neural and Muscle-Tissue Factors 17. I ncorporating resistance training into an aerobic endurance training program can improve the ability of the heart, lungs, and circulatory system to function under conditions of high pressure and force production. Resistance exercise, however, is not effective in increasing maximal oxygen consumption. 18. Endocrine Responses to Anaerobic and Aerobic Exercise During high-intensity exercise, the concentrations of hormones in blood and other body fluids can increase 10 to 20 times over their levels at rest. Exercise-induced mechanisms contribute to changes in hormone concentrations, including changes in clearance rates in the liver, shifts in blood volume, receptor interactions. hormone degradation, and 19. Results of Aerobic EnduranceExercise Training Reduced body fat Increased maximal oxygen uptake Increased respiratory capacity Lower blood lactate concentrations Increased mitochondrial and capillary densities Improved enzyme activity 20. C ombining resistance and aerobic endurance activities appears to interfere primarily with strength and power performances. 21. Responses of Muscle Fibers With Maximal Simultaneous Training for Strength and Endurance 22. O vertraining (defined as excessive frequency, volume, or intensity of training, resulting in fatigue) can cause dramatic performance decreases in athletes of alltraining levels. 23. Markers of Anaerobic Overtraining Psychological effects: decreased desire to train; decreased joy from training Acute epinephrine and norepinephrine increases beyond normal exercise-induced levels Performance decrements, although these occur too late to be a good predictor 24. Markers of Aerobic Overtraining Decreased performance Decreased percentage of body fat Decreased maximal oxygen uptake Altered blood pressure Increased muscle soreness Decreased muscle glycogen Altered resting heart rate Increased submaximal exercise heart rate Decreased lactate (continued) 25. Markers of Aerobic Overtraining(continued) Increased creatine kinase Altered cortisol concentration Decreased total testosterone concentration Decreased ratio of total testosterone to cortisol Decreased ratio of free testosterone to cortisol Decreased ratio of total testosterone to sex hormone-binding globulin Decreased sympathetic tone Increased sympathetic stress response 26. Relative Responses of Physiological Variables to Training and Detraining