Slow-twitch (ST) muscle fibers are predominantly characterized by containing:____________?
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Answer: A. Marathon runners
Explanation
Marathon runners rely heavily on slow-twitch muscle fibers, which are specialized for endurance and aerobic efficiency. These fibers contract slowly and resist fatigue by utilizing oxygen to generate sustained adenosine triphosphate energy. High concentrations of myoglobin and numerous mitochondria enable endurance athletes to maintain steady paces over long distances. Slow-twitch fibers, also known as Type I muscle fibers, are rich in capillary networks for continuous oxygen delivery. Genetics largely determines the proportion of slow-twitch versus fast-twitch muscle fibers an individual possesses naturally. Endurance training enhances the oxidative capacity of Type I fibers without causing significant increases in muscle cross-sectional area.
Sprinters rely primarily on fast-twitch fibers for explosive power and speed over short distances rather than endurance. Weight lifters utilize fast-twitch fibers to generate maximal force during brief, high-resistance lifts like squats. Throwers require explosive power and fast-twitch muscle recruitment to propel heavy objects across competitive distances.
- Subject
- Physical Education
- Category
- Physical Education
- Topic
- —
- Difficulty
- medium
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