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if i understand correctly the exercise suggested, the stated leg lift exercise will:
actually exercise the quads isometrically (involves no movement or contracture/shortening of the muscle(s) involved), & in part involves the knee joint, although statically,
and
will exercise the hip flexors isotonically (involves movement, or contracture/shortening of the muscle(s) involved - and, upon the "return" motion lengthening of the muscle(s) involved).
[Note: contracture, as used here, refs to just the concentric portion of a contraction when the muscle shortens against the load and not the eccentric portion of the contraction when the muscle lengthens against the load - e.g. when returning to the starting position of the rep.]
Edited by pj on 07/27/2005 10:08:15 MDT.
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