While every skeletal muscle of every person contains all three types of skeletal

Question

While every skeletal muscle of every person contains all three types of skeletal muscle fibers, genetics play a role in the % distribution. Given the following hypothetical example shown in the table below of two men of same age, neither of whom exercises regularly . Male #1 25 Male #2 25 50% Test subject: Age %type I muscle fibers in biceps brachii %type IIA muscle fibers in biceps brachi 96 type IIB muscle fibers in biceps brachii 160% 25% 20% | 15% 30% Which test subject would potentially make a better long-distance swimmer? Justify your answer.

Explanation / Answer

Male 1 would potentially make a better long distance swimmer. Type I muscle fiber has slow twitch, least fatigueness and thus can perform for long time. Type IIA has fast oxidative twitch, moderate fatiguness and thus can perform for longer time but less than typeI. Type IIB has fast glycolytic twich, severe fatigueness and thus can perform for very short time. Here in Male I the type I muscle fiber content is higher and thus can perform slowly for long time.  

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