Muscle Fibers, Type I

Medical Condition:
Muscle Fibers, Type I

Skeletal muscle fibers having low myofibrillar ATPase activity, low glycogen content, and high myoglobin content, high mitochondrial oxidative enzyme activities, and an intermediate mitochondrial content which produce a slow twitch and are fatigue-resistant. (From Best, Physiological Basis of Medical Practice, 12th ed, p101)