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Enhancement of mechanical performance in tetanized intact muscle fibers when they are first lengthened by quick changes in load from Po to P > Po and then subjected to quick changes in load from P > Po to P < Po. Note that the fiber shortens under a load = Po (B), as well as under loads P < Po (C, D), while it is lengthened under a load > Po (A); and also note that the fiber starts shortening without any velocity transients. From Ref. [15].
