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Characteristics of the Three Muscle Fiber Types |
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| Fiber Type | Slow Twitch (ST) | Fast Twitch A (FT-A) | Fast Twitch B (FT-B) |
| Contraction time | Slow | Fast | Very fast |
| Size of motor neuron | Small | Large | Very large |
| Resistance to fatigue | High | Intermediate | Low |
| Activity used for | Aerobic | Long term anaerobic | Short term anaerobic |
| Force production | Low | High | Very high |
| Mitochondrial density | High | High | Low |
| Capillary density | High | Intermediate | Low |
| Oxidative capacity | High | High | Low |
| Glycolytic capacity | Low | High | High |
| Major storage fuel | Triglycerides | CP, Glycogen | CP, Glycogen |