PHYSIOLOGY
DIFFERENT TYPE AND STRUCTURE OF MUSCLE FIBERS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Fast Twitch
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Slow Twitch
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Either A or B
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None of the above
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Detailed explanation-1: -In humans, type I, or slow-twitch, fibers possess slower twitch speeds and are relatively fatigue resistant. Type IIa fibers, or fast oxidative glycolytic (FOG) fibers, present higher twitch speeds than type I fibers but are less fatigue resistant.
Detailed explanation-2: -Type I fibers are most resistant to fatigue. Slow-twitch muscle fibers are referred to as Type I muscle fibers and fast-twitch are referred to as Type II.
Detailed explanation-3: -Type 1 (“slow twitch”) fibers contain more mitochondria, which means they can produce more energy and are better for long, aerobic activities. Type 2 (“fast twitch”) fibers, on the other hand, are suited for short, fast bursts of activity that don’t require as much oxygen.
Detailed explanation-4: -Because fast-twitch fibers use anaerobic metabolism to create fuel, they are better at generating short bursts of strength or speed than slow muscles. However, they fatigue more quickly.