Active Insufficiency
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Active insufficiency occurs when a multi-joint muscle reaches a length (shortened) where it can no longer apply an effective force. To demonstrate active insufficiency one can fully flex (bend) the knee on one leg while simultaneously trying to bring that leg back to achieve full hip extension. Hip extension will be limited because the hamstrings are unable to shorten enough to produce a complete range of motion. Some will also notice a cramping in the hamstring muscles during this maneuver. Straightening the leg (extending the knee) should restore full range of hip extension motion and the difference will be significant.
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This page created 06 Sep 2011 00:42
Last updated 27 Jan 2012 20:58
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