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Effects of Different Types of Muscle Fibers and Relations to Disease
| Fiber Type | I | IIa | IIb |
|---|---|---|---|
| Twitch type | Slow | Fast | Fast |
| Metabolism | Oxidative | Oxidative‐glycolytic | Glycolytic |
| Major storage fuel | Triglycerides | Phosphocreatine, glycogen | Phosphocreatine, glycogen |
| Insulin sensitivity | Sensitive | Resistant | Resistant |
| Vascularity | High | Low | Low |
| Frequency in blacks | Low | High | High |
| Frequency in obesity | Low | High | |
| Frequency in type 2 diabetes mellitus | High | ||
| Frequency in hypertension | High |
