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Cell shortening and time to 50% relaxation at 1 and 5 Hz when voltage clamp depolarization was maintained at either (A) 50 ms or (B) 125 ms. When depolarization duration was maintained there were no changes in contraction amplitude or relaxation in either group. Thus, in MCT myocytes when APD restitution was absent, mechanical restitution was absent. n = 11 CON and 11 MCT myocytes, paired t-tests 1 vs. 5 Hz for CON and MCT.
