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- W1992890306 abstract "It has been shown experimentally that, in single muscle fibers, the force-velocity relation is more complicated than usually found (Edman, 1988a, Edman, 1988b). In particular, there is a discontinuity in this relation for high loads (P/Po ≥ 0·8), i.e. for low velocities of shortening. Here the mathematical approach of the crossbridge behavior is used, independent of their mechanical role(s). This approach has been already presented in previous papers (Morel, 1984a, Morel, 1984b, and references therein). It was found that, at P/Po ≈ 0·80, the force-velocity relation presents a reversal of curvature, which was compatible with the previous results obtained by Edman et al. (1976, Acta Physiol. Scand. 98, 143–156). However, by using extremely elegant techniques, Edman, 1988a, Edman, 1988b found a different relation. Here, this problem is studied and it is shown that it is possible to fit the new relationship, provided it is assumed that shortening per se modifies the mechanical properties of the crossbridges and/or the actin filaments. For instance, the interval of attachment of a crossbridge increases with V and the constants of attachment f and detachment g decrease with V. Moreover, it is shown that this approach can predict the approximate constancy of the proportion of crossbridges attached to actin, irrespective of V. This is an old result presented by Podolsky et al. (1976, Proc. natn. Acad. Sci. U.S.A. 73, 813–817). This proportion is ≈ 0·97. It is also shown that the present approach can predict as well the decrease in the proportion of crossbridges attached to actin when V increases. This is also an old result presented first by Huxley (1957, Prog. Biophys. biophys. Chem. 7, 255–318) and confirmed by Ford et al. (1985, J. Physiol., Lond. 361, 131–150). In this last case, the proportion of attached crossbridges at V = 0 is ≈ 0·92 and, at Vmax, ≈ 0·37. Finally, the present approach also predicts the approximate constancy of the rate of ATP splitting, irrespective of V (e.g. Curtin & Woledge, 1978, Physiol. Rev. 58, 697–761)." @default.
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- W1992890306 date "1990-10-01" @default.
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- W1992890306 title "Velocity-induced modifications in the crossbridge and/or the actin filament behavior during shortening of muscle fibers" @default.
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- W1992890306 doi "https://doi.org/10.1016/s0022-5193(05)80745-3" @default.
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