Muscle contraction types and all or none law
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Muscle contraction types and all or none law

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  • 1. Lloyd Dean Muscle Contraction
  • 2. Aims
    • By the end of the lesson you should be able to:
    • Describe the all or none law of muscle physiology.
    • State muscle fatigue and oxygen debt in relation to muscle contraction
    • List the types of muscle contraction
    • Describe agonists, antagonist, synergists and fixators applied to a range of exercises.
  • 3. All or None Law
    • To fire a gun there must be enough force to pull the trigger
    • If you pull the trigger harder the bullet does not travel faster!
    • A contracted muscle receives a nerve impulse either completely or not at all
    • The action potential (Nerve impulse) is at full strength or not at all
    • This is the All or None Law!
  • 4. Muscle Fatigue & Oxygen Debt
    • How do these both impact the muscle contraction?
    • If no ATP is available no contraction will take place
    • If you use more oxygen that is taken in through the lungs then there is a deficit of oxygen
    • This can make the blood PH level rise, and become acidic (Commonly know as an increase in Lactate acid)
    • This is a by product of exercises without oxygen, or anaerobically
  • 5. Antagonistic Pairs Biceps – Prime mover Triceps – Antagonistic This muscle determines the movement of an action –by Contracting Biceps – Antagonistic Triceps – Prime Mover This muscle works with the prime mover but creates an opposing action – by relaxing
  • 6. Agonist, Antagonists and.......
    • Synergists
    • Fixators
    • Help to steady the movement
    • In biceps curl the brachialis helps the action
    • Assist in stabilising the origin of the agonist to ensure movement occurs
    • In biceps curl the fixators would
  • 7. Muscle contraction
    • Three types
    • Isometric
    • Concentric
    • Eccentric
  • 8. Isometric Contraction
    • Muscle stays the same length during Contraction or when the activity is being carried out.
    • Name a sport/activity where isometric contraction occurs?
  • 9. Concentric Contraction
    • This where the muscle shortens when performing an action
    • Name a sport/activity where Concentric contraction occurs?
  • 10. Eccentric Contraction
    • Where the muscle lengthens under tension – ends of the muscle move further away during an action
    • Name a sport/activity where Eccentric contraction occurs?
  • 11.  
  • 12. Muscle Tone
    • Muscle tissue never really relaxes and is in constant partial contraction – this gives muscle its shape or tone.
  • 13. Review of aims
    • You should now be able to:
    • Describe the all or none law of muscle physiology.
    • State muscle fatigue and oxygen debt in relation to muscle contraction
    • List the types of muscle contraction
    • Describe agonists, antagonist, synergists and fixators applied to a range of exercises.