Ex Phys Ch 10 Kenney6E_PP (1).ppt - Adaptations to Resistance Training CHAPTER 10 Overview \u2022 Resistance training gains in muscular fitness \u2022

Ex Phys Ch 10 Kenney6E_PP (1).ppt - Adaptations to...

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Adaptations to Resistance Training
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CHAPTER 10 Overview Resistance training: gains in muscular fitness Mechanisms of muscle strength gain Interaction between resistance training and diet Resistance training for special populations
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Resistance Training: Introduction Resistance training yields substantial strength gains via neuromuscular changes Important for overall fitness and health Critical for athletic training programs
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Resistance Training: Gains in Muscular Fitness After 3 to 6 months of resistance training 25 to 100% strength gain Learn to more effectively produce force Learn to produce true maximal movement Strength gains similar as a percent of initial strength Young men experience greatest absolute gains versus young women, older men, children Due to incredible muscle plasticity
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Mechanisms of Muscle Strength Gain Hypertrophy versus atrophy Muscle size muscle strength Muscle size muscle strength But association more complex than that Strength gains result from Muscle size Altered neural control
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Mechanisms of Muscle Strength Gain: Neural Control Strength gain cannot occur without neural adaptations via plasticity Strength gain can occur without hypertrophy Property of motor system, not just muscle Motor unit recruitment, stimulation frequency, other neural factors essential
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Mechanisms of Muscle Strength Gain: Motor Unit Recruitment Normally motor units recruited asynchronously Synchronous recruitment strength gains Facilitates contraction May produce more forceful contraction Improves rate of force development Capability to exert steady forces Resistance training synchronous recruitment (continued)
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Mechanisms of Muscle Strength Gain: Motor Unit Recruitment (continued) Strength gains may also result from greater motor unit recruitment Neural drive during maximal contraction Frequency of neural discharge (rate coding) Inhibitory impulses Likely that some combination of improved motor unit synchronization and motor unit recruitment strength gains
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Mechanisms of Muscle Strength Gain: Motor Unit Rate Coding Limited evidence suggests rate coding increases with resistance training, especially rapid movement, ballistic-type training
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