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Simultaneous measurement of muscle mechanics and ATPase activity. Left y-axis (filled circles) is frictional stress per unit strain. Right y-axis (open squares) is rate of ATP utilization. Inset: cross plot of same data with regression line, r2 = 0.86, P < 0.0007 (Fisher's z transform).11 Reproduced with permission from Fredberg et al., J. Appl. Physiol. 81(6), 2703–2712 (1996). Copyright 1996 American Physiological Society.
