Physiology of Exercise - Skeletal muscle: mechanical properties and fiber types
3 important questions on Physiology of Exercise - Skeletal muscle: mechanical properties and fiber types
How long does it take to reach peak tension in type I and type II muscle fibers, respectively?
Type I ~ 80ms
Type II ~ 30 ms
Which properties explain the differences between Type I and Type II muscle fibers?
1. [ATPase] is lower in Type I so less splitting of P from ATP is possible, so slower force production
2. Type I has a slower uptake rate for Ca2+ by the sarcoplastic reticulum
3. Lower Ca2+ activity
Which fibers contain the most myoglobin?
Type I fibers
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