Muscle Fibres

Muscle Fibres

Muscles are made from thousands of muscles fibres which are bound together by connective tissue
Each muscle is made from a combination of 2 types of fibres. (Genetics)
1. 1) Fast twitch (2 types)
  1. Type 2b – Fast Twitch Glycolytic (FTG)
    1. Structure
      1. Capillary density - Low
      2. Myoglobin content – lowest (protein which carries oxygen)
      3. Motor Neuron Size – Large (send messages to contract muscle)
      4. Colour – White
      5. Size – Large
      6. Mitonchondrial density – lowest (where aerobic respiration takes place within cells)
    2. Functions
      1. Aerobic capacity - Low
      2. Fatiguability – Easily Fatigued
      3. Speed of contraction - Fast
      4. Force of contraction - High
      5. Anaerobic capacity - High
    3. POWER LIFTING SPRINTING
  2. Type 2a – fast oxidative glycolytic (FOG)
    1. Structure
      1. Capillary Density – high
      2. Colour – White
      3. Size – Large
      4. Motor Neuron Size – Large (send messages to contract muscle)
      5. Mitonchondrial density – low (where aerobic respiration takes place within cells)
      6. Myoglobin content – low (protein which carries oxygen)
    2. Functions
      1. Anaerobic capacity - Medium
      2. Speed of contraction - Fast
      3. Force of contraction - High
      4. Aerobic capacity - Medium Anaerobic
      5. Speed of contraction - Fast
    3. 200M swim 800M run
2. 2) Slow twitch
  1. Type 1 - Slow Oxidative
    1. Structure
      1. Capillary density – high (blood vessels)
      2. Myoglobin content – high (protein which carries oxygen)
      3. Size of fibre – Small
      4. Motor Neuron Size – small (send messages to contract muscle)
      5. Colour – Red
      6. Mitonchondrial density – high (where aerobic respiration takes place within cells)
    2. Function
      1. Anaerobic capacity - Low
      2. Speed of contraction - Slow
      3. Fatiguability – Fatigue resistant
      4. Force of contraction - Low
      5. Aerobic capacity - High
    3. MARATHON RUNNING
3. Everyone has a different mix of each, some peoples muscles may be made of upto 80-90% of one type

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