Characteristic | Type I | Type IIa | Type IIb |
|---|---|---|---|
Fatigue resistance | High | Intermediate | Low |
Mitochondrial density | High | Intermediate | Low |
Metabolic type | Oxidative | Oxidative/glycolytic | Glycolytic |
Myoglobin content | High | Intermediate | Low |
Glycogen content | Low | Intermediate | High |
Triacylglycerol content | High | Intermediate | Low |
Glycogen phosphorylase activity | Low | Intermediate | High |
Phosphofructokinase activity | Low | Intermediate | High |
Citrate synthase activity | High | Intermediate | Low |