If a marathon runner experiences muscle fatigue late in a race, which consequence follows regarding muscle fiber recruitment?

💡 Explanation

Type IIx fibers are recruited as fatigue increases because these fibers can generate more force, though less efficiently, when other fiber types are depleted and fatigued. Therefore, recruiting Type IIx helps maintain force output rather than relying solely on depleted type I or IIa fibers and attempting to enhance energy production which would be too slow.

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