ENS 401A Lecture Notes - Lecture 1: Gluteus Maximus Muscle, List Of Flexors Of The Human Body, Myocyte
19 Feb 2017
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Document Summary
Muscle properties length-tension curve: explains the relationship between sarcomere length and force-generating capacity. Shortening < resting length: contractile protein overlap = reduced force-generating capacity. Slight stretching > 100: increases orientation between contractile proteins = increased force-generating capacity, optimal at 20% > resting length (120%) Stretching > optimal length: reduced binding opportunities = decreased force-generating capacity. Poor posture, awkward positions, repetitive patterns, poor exercise programming and technique, lifestyle. Congenital, trauma, surgical, pathology, structural issues: outcome. Shortened muscles also experience altered neural activity. Shortened muscle = lower activation thresholds for aps hypertonicity. Step 1: requires smaller neural stimulus to generate ap (in neuron) Synergist is now required to perform key action(s) of the weakened or inhibited prime mover (agonist) Example: tight hip flexors inhibit gluteus maximus forces compensatory actions from hamstrings to facilitate hip extension. Sensory-motor integration: ability of sensory and motor divisions to function in synchronized and coordinated manners. Motor learning (skill development) takes time and we proceed through stages.
