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Muscle Fiber Types
Characteristics of Muscle Fiber Types (Slow, Intermed, Fastest)
| Question | Answer |
|---|---|
| Speed of Development of Maximum Tension: SLOWEST | Type I |
| Speed of Development of Maximum Tension:INTERMEDIATE | Type IIa |
| Speed of Development of Maximum Tension:FASTEST | Type IIb |
| Myosin ATPase activity: Slow | Type I |
| Myosin ATPase activity: Fast | Type IIa |
| Myosin ATPase activity: Fastest | Type IIb |
| Diameter: Small | Type I |
| Diameter: Medium | Type IIa |
| Diameter: Large | Type IIb |
| Contraction Duration: Longest | Type I |
| Contraction Duration: Short | Type IIa |
| Contraction Duration: Shortest | Type IIb |
| Ca++/ATPase activity in SR: Moderate | Type I |
| Ca++/ATPase activity in SR: High | Type IIa |
| Ca++/ATPase activity in SR: Highest | Type IIb |
| Endurance: Fatigue Resistant | Type I |
| Endurance: Fatigue Resistant (Less) | Type IIa |
| Endurance: Easily Fatigud | Type IIb |
| Use: Posture, most used | Type I |
| Use: Standing, Walking | Type IIa |
| Use: Jumping, least used | Type IIb |
| Metabolism: Oxidative; aerobic | Type I |
| Metabolism: Glycolytic but more oxidative with endurance training | Type IIa |
| Metabolism: Glycolytic, more anerobic than type IIa | Type IIb |
| Capillary Density: High | Type I |
| Capillary Density: Medium | Type IIa |
| Capillary Density: Low | Type IIb |
| Mitochondria: Numerous | Type I |
| Mitochondria: Moderate | Type IIa |
| Mitochondria: Few | Type IIb |
| Color: Dark Red | Type I |
| Color: Red | Type IIa |
| Color: Pale | Type IIb |
| Slow-Twitch oxidative, red muscle | Type I |
| Fast-Twitch oxidative-glycolytic, red muscle | Type IIa |
| Fast-Twitch glycolytic; white muscle | Type IIb |