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Lloyd Dean
Muscle Contraction
AimsBy 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.
All or None LawTo 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!
Muscle Fatigue & Oxygen DebtHow 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
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
Agonist, Antagonists and.......
Synergists FixatorsHelp 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
Muscle contraction
Three types
Isometric
Concentric
Eccentric
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?
Concentric Contraction
This where the muscle shortens when performing an action
Name a sport/activity where Concentric contraction occurs?
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?
Muscle Tone
Muscle tissue never really relaxes and is in constant partial contraction – this gives muscle its shape or tone.
Review of aimsYou 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.
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