pe muslce fibres

  • Created by: Elle99
  • Created on: 02-10-17 09:18
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  • Skeletal and muscular systems
    • skeletal muscle contraction
      • For muscle fibre to generate enough force
        • motor neurone need to be activated by brain
          • motor units join a fibre at a neuromuscular junction
            • motor neuron and muscle fibres = motor unit
              • small motor units
                • stimulate small muscle fibre
                  • small and slow amount of force, long duration, resist fatigue
              • large motor units
                • stimulate large muscle fibres
                  • large amount of force rapidly, fatigue quickly
        • neurone
          • a nerve cell which conducts a nerve impulse to a group of muscle fibres
        • nerve  impulse initiated in motor neurone
          • nerve impulse conducted down to axon by a nerve action potential
            • neuromuscular junction
              • imitates the release of the neurotransmitter (acetylcholine)
                • secreted into synoptic ceft
                  • help conduct nerve impulse across gap
                    • if enough acetylcholine and electrical charge above threshold
                      • muscle fibre contract
                        • all or none law
                          • motor unit receives a stimulus
                            • creates an action potential
                              • reaches threshold charge
                                • all muscle fibres will contact, same time, maximum force
          • action potential
            • +ve electrical charge inside nerve and muscle
              • cells which conduct nerve impulse down the neutron and into muscle fibre
    • Muscle fibres
      • slow oxidative
        • aerobic/endurance
          • provide energy for sub max work
            • each individual fibre recover quickly (90secs)
        • long intensity
          • 1:1/1:05
        • long duration
          • running
        • marathon
          • no fibre damage
            • enhances blood flow, enhance healing process
        • cross country skiing
          • 3, 10min, moderate instensity
      • fast oxidative glycolytic
        • speed endurance
        • 400m, 800m, 1500m
      • fast glycolytic
        • anaerobic/explosive
        • high intensity
        • short duration
        • 100m sprint, hammer throw, triple jump
          • eccentric muscle damage
            • maximal efforts required
              • delayed muscle soreness
                • 24-48hrs after
        • 4-10 days to recover
        • leave 48 hrs to use same muscle group
        • 1:3+
        • 3-5 min rest, 2-6 reps
      • mix
        • teams players
          • aerobic and aerobic
            • motor units contain same type of muscle fibre
              • nervous system can produce movement for different activity
            • changing muscle fibre type
              • recruit SO
                • resist fatigue
                  • force required increases
                    • recruit FOG
                      • maximum overload
                        • FG
        • football, hockey

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