pe_exam - 73 The two major types of muscle fibers are...

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73. The two major types of muscle fibers are slow-twitch fibers and fast-twitch fibers. Slow- twitch fibers are relatively fatigue resistant but they don’t contract as rapidly or strongly as fast- twitch fibers. Principal energy system that fuels slow-twitch fibers is aerobic. Fast-twitch fibers contract more rapidly and forcefully than slow-twitch fibers but fatigue more quickly. Although oxygen is important in the energy system that fuels fast-twitch fibers, they rely more on anaerobic metabolism than slow-twitch fibers. Slow-twitch fiber activities include endurance exercises like jogging and swimming. Fast-twitch fiber activities use more power and strength like sprinting and lifting. 74. 1) Improved performance of physical activities: Increased strength can enhance your enjoyment of sports. It also results in modest improvements in maximal oxygen consumption. 2) Injury prevention: Good muscle strength and endurance in the abs, hips, back, and legs support the back in proper alignment and help prevent back pain.
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