Abstract
Calcium-activated force development in skinned frog muscle fibers is inhibited by osmotically compressing the fiber, probably owing to a decrease in spacing between the myofilaments. This inhibition depends upon sarcomere length in that fibers at long lengths must be compressed further than those at short lengths to achieve the same degree of inhibition. As a result, this length dependency of inhibition tends to compensate for the reduction of force due solely to the decrease in interfilament spacing which occurs with stretch in intact fibers.
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