muscle fibres

type I - slow oxidative
1. 110 m/s slower contraction speed
  1. anaerobic capacity is low
    1. produce energy aerobically
  2. myosin ATPase/ glycolytic enzyme activity is low
2. motor neurone size is small
  1. better adapted to low intensity exercise
3. force produced is low
4. myoglobin content is high
  1. capillary density is high
5. fatigability is low
  1. aerobic capacity is very high
6. mitochondrial density is high
7. motor neuron conduction capacity is slow
type IIa - fast glycolytic oxidative
1. longer burst of energy needed
  1. used for short, intense bursts of effort
    1. myosin ATPase/ glycolytic enzyme activity is high
  2. fatigability is medium
  3. aerobic capacity is medium
    1. generate a greater force of contraction
  4. anaerobic capacity is high
2. contraction speed is faster at 50 m/s
  1. motor neurone size is large
    1. capillary density is medium
  2. produce energy anaerobically
3. motor neurone conduction capacity is fast
  1. myoglobin content is medium
4. force produced is high
  1. mitochondrial density is medium
type IIb - fast glycolytic
1. fatigue much faster
2. highly explosive events
  1. contraction speed is faster at 50 m/s
3. motor neurone size is large
4. motor neuroine conduction capacity is fast
  1. force produced is high
    1. fatigability is high
  2. mitochondrial density is low
    1. myoglobin content is low
      1. capillary density is low
    2. aerobic capacity is low
    3. anaerobic capacity is very high
    4. myosin ATPase/ glycolytic enzyme activity is very high

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