To the problem of cross-bridge tension in steady muscle shortening and lengthening

Details To the problem of cross-bridge tension in steady muscle shortening and lengthening To the problem of cross-bridge tension in steady muscle shortening and lengthening

2009-09-03

arxiv.org/abs/0909.0687v1

Physics

Biological Physics

Contents: abstract, 246 words; text, 2906 words, 3 figures, 21 references The manuscript was submitted to the Journal of Biome

Scientific paper

Despite the great success of the Huxley sliding filament model proposed half a century ago for actin-myosin linkages (cross-bridges), it fails to explain the force-velocity behavior of stretching skeletal muscles. Huxley's two-state kinetic equation for cross-bridge proportions is therefore reconsidered and a new solution to the problem of steady muscle eccentric and concentric contractions is reported. When the second law of statistical thermodynamics is applied to cross-bridge proportions, the weakly bound states appear to be correlated to the strongly bound states via structural and kinetic intrinsic muscle characteristics. The explicit force-velocity curve fits the empirical tension-velocity data on frog muscle shortening using only one adjustable parameter, while the Huxley model employed four parameters.

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