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Muscle Fiber Types

Characteristics of Muscle Fiber Types (Slow, Intermed, Fastest)

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
Created by: 1519275428



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