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A: in the ILPO, lengthening (open symbols) and shortening strain rate (filled symbols) were not significantly different between unloaded (black) vs. loaded (gray) conditions at any speed. B: in the MG, only lengthening strain rate increased significantly with load; however, this largely reflects the fact that there was no lengthening during unloaded locomotion. Strain rate increased significantly with speed in the ILPO under both conditions and in the MG when animals were loaded.
