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| Characteristic |
Type I Fibers |
Type IIA
Fibers |
Type IIB
Fibers |
| Alternate
Name |
Slow
Twitch /Slow Oxidative |
Fast
Twitch / Fast Oxidative Glycolitic (FOG) |
Fast
Twitch / Fast Glycolytic |
| Speed
of Contraction |
Slow |
Fast |
Fast |
| Endurance |
High |
Medium |
Low |
| Aerobic
Capacity |
High |
Medium |
Low |
| Capillary
Density |
High |
Medium |
Low |
| Aerobic
Enzyme Content |
High |
Medium |
Low |
| Mitochondria
Density |
High |
Medium |
Low |
| Fatigability |
Low |
Medium |
High |
| Force
Production |
Low |
Medium |
High |
| Diameter |
Small |
Large |
Largest |
| Fuel
Source Used |
Fat |
Glycogen,
Fat |
Glycogen |
| Primary
Energy Pathway Used |
Krebs |
Krebs
& Glycolysis |
Glycolysis |
| Hypertrophy
Potential |
Little |
Large |
Largest |
| Example
Activity Used for |
Running
etc. |
Body Building |
Power lifting |
| Recruited |
First |
Second |
Last |
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| Primary
Muscle Proteins: Actin (Thin Filament), Myosin (thick Filament) |
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| Muscle Contraction
Theory : "Sliding Filament Theory" |
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| Contractile
unit of muscle: Sarcomere |
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| Hypertrophy
- Growth of muscle size (primarily responsible for muscle growth) |
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| Hyperplasia
- Growth of muscle fiber # (does not occur much in humans) |
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