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muscle strength - Coggle Diagram
muscle strength
motor unit recruitment
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Henneman's size principle- small motor units recruited first, larger ones only recruited when needed for greater loads
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muscle size
increased area means more muscle proteins, which means more sarcomeres which then means more contractile force available
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active length tension
cross bridges are required to develop tension.
without this tension/overlap, force cant be generated because not enough cross bridges form
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length-tension
theoretically, max length = max tension
but in real life, thats not the case. we function best in the middle range of the curve, combo of both active and passive insf.
example- baseball pitcher winding up is passive, increases his pitch force pdxn
moment arm
moment arm changes throughout joints ROM, muscle most fxnal at different points.
elbow joint is at midrange, hip abd at stance, etc.
contraction velocity
eccentric will always produce greater torque
-more crossbridges formed
-more rapid crossbridge reattachment
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passive length tension
contractile elements are elastic and would allow a lot of stretch if able.
connective tissue limits stretch
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rate coding
force produced by a motor unit is modulated by rate of sequential AP's
when AP's are closer together than the muscle has time to contract, called tetany.
50 mz or higher
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