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Muscle fiber characteristics

Muscle fiber characteristics
Type  Color Contraction Metabolism Myoglobin content
I Red Slow twitch Oxidative High
IIA Red Fast twitch Fast oxidative High
IIX White Fast twitch Anaerobic glycolysis Low
Reproduced with permission from: Wasserman K, Hansen JE, Sue DY, et al. Physiology of exercise. In: Principles of exercise testing and interpretation: Including pathophysiology and clinical applications, 5th ed, Lippincott Williams & Wilkins, 2011. Copyright © 2011 Lippincott Williams & Wilkins. www.lww.com.
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