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The purpose of this study was to test the hypothesis that force depression following muscle shortening is caused by stress-induced inhibition of the cross-bridges in the zone of new overlap between thick and thin filaments. Force depressions following shortening were assessed in five separate tests on the cat soleus. It was found that force depressions following shortening were inversely related to the speed of shortening and were directly related to the amount shortening, which is in agreement with published results on muscles and fibre preparations. It was further observed that the force depressions were directly related to the force produced during the shortening phase, and that the force depressions were systematically reduced by relaxing the stress on the muscle following shortening. These latter results could not be compared with corresponding literature values for lack of systematic testing of these properties …