Lecture 23

Lecture 23 - Muscle Performance Power Speed(Velocity...

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Muscle Performance Power Speed x Strength (Velocity) (Force) Endurance Sustained Activity type of metabolism aerobic vs. anaerobic Fiber Type. ..
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Fiber Types (skeletal muscle) 1. Fast fibers large diameter rapidly contracting anaerobic metabolism 2. Slow fibers small diameter slowly contracting aerobic metabolism 3. Intermediate fibers ‘medium’ diameter relatively fast primarily anaerobic Important: Within a motor unit, all fibers are the same type
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Fast Fibers (also called ‘FG’ for ‘fast-glycolytic; or Type IIb) 1. Large diameter generate large force because tension is proportional to cross sectional area many sarcomeres in parallel many cross bridges per fiber… 2. High speed fast myosin ATPase 3. Low resistance to fatigue - relies on glycolysis low aerobic capacity few mitochondria low myoglobin content. ..
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Slow Fibers (also called ‘SO’ for ‘slow oxidative; or Type I) 1. Small diameter generate low force few sarcomeres in parallel few cross bridges per fiber…
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This note was uploaded on 09/11/2011 for the course PSIO 201 taught by Professor Stanescu during the Summer '08 term at Arizona.

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Lecture 23 - Muscle Performance Power Speed(Velocity...

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