1-Skeletal Muscle-Whole Muscle Physiology

Of stretch on skeletal muscle contraction skeletal

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Unformatted text preview: whole muscle How contraction occur if each cell contracts “All-or-None?” contraction What are the effects of multiple stimuli on a muscle? Does stretch have any effect on muscle contraction? “Types” of muscle contraction? Other considerations (i.e. effects of exercise, Other denervation, etc.) denervation, Types of Muscle Contraction Types Isometric contraction: change in tension with NO change change in muscle length. Isotonic contraction: change in muscle length with NO change in muscle tension. Types of Muscle Contraction Types Isotonic contraction: TWO DISTINCT TYPES! TWO Concentric contraction tension develops & is Concentric maintained as muscle shortens. shortens Eccentric contraction tension develops & is maintained Eccentric as muscle lengthens. lengthens Isometric vs. Isotonic Isometric Muscle Contraction Considerations Muscle Contraction (shortening) vs. Elasticity (stretching) Elasticity What are the effects of multiple stimuli on a muscle? How can varying strengths of whole muscle How contraction occur if each cell contracts “All-or-None?” contraction Does stretch have any effect on muscle contraction? “Types” of muscle contraction? Other considerations (i.e. effects of exercise, Other denervation, adaptation, etc.) denervation, Adaptation in Muscle Fibers Adaptation Improvement in oxidative capacity Muscle hypertrophy Muscle hypertrophy Interconversion between fast muscle fiber Interconversion types (Type IIa to IIb & vice versa) types Muscle atrophy Muscle atrophy Limited ability to repair damaged muscle Questions? Questions?...
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