flexibility and stability are important for effective/efficient movement
stability vs mobility
joints typically favor one over the other. ex: lumbar spine more stable than mobile. lack of flexibility typically causes and overcompensation of mobility into another muscle area. Hip extension with tight hip flexors causes hips to rotate into transverse plane
when people cannot perform exercises the way they are meant to be performed due to mobility and flexibility compensations and imbalances.
r'ship bt the contractile proteins (actin and myosin) of a sacromere in a myofibril and their force-generating capacity. stretching: inc sacromere alignment and resting alignment shortening: overlap of contractile fibers, reduces muscles force-generating capacity.
immobilization, trauma and aging all shorten muscles. This causes a potential for greater force in the shorten position but less force in lengthened or resting positions due to a loss of sacromeres (500,000 in one muscle myofibril) passive stretching and elongation of tightened muscles will help put sacromeres back in place to restore normal length and resting relationship
happens on the opposing side of a muscle that is shortening of a joint. sacromeres are added and inc force in lengthened position but dec in resting or short position. to fix: must strengthen muscle from resting or shortening position. ex: shoulders protract, full ROM back rows not recommend, but isometric or shortened rows recommended.
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