Why does intense exercise cause muscle fatigue faster in fast-twitch muscle fibers compared to slow-twitch fibers?

💡 Explanation

Fast-twitch fibers fatigue faster because they primarily use anaerobic glycolysis for ATP production, leading to a rapid buildup of lactate and a decrease in pH. This inhibits muscle contraction, therefore causing faster fatigue, rather than relying on the more sustainable oxidative phosphorylation used by slow-twitch fibers.

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