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- W2180043884 abstract "Myburgh, Kathryn H., and Roger Cooke. Response of compressed skinned skeletal muscle fibers to conditions that simulate fatigue. J. Appl. Physiol. 82(4): 1297–1304, 1997.—During fatigue, muscles become weaker, slower, and more economical at producing tension. Studies of skinned muscle fibers can explain some but not all of these effects, and, in particular, they are less economical in conditions that simulate fatigue. We investigated three factors that may contribute to the different behavior of skinned fibers. 1) Skinned fibers have increased myofilament lattice spacing, which is reversible by osmotic compression. 2) A myosin subunit becomes phosphorylated during fatigue. 3) Inosine 5′-monophosphate (IMP) accumulates during fatigue. We tested the response of phosphorylated and unphosphorylated single skinned fibers (isometric tension, contraction velocity, and adenosinetriphosphatase activity) to changes in lattice spacing (0–5% dextran) and IMP (0–5 mM) in the presence of altered concentrations of P i (3–25 mM), H + (pH 7–6.2), and ADP (0–5 mM). The response of maximally activated skinned fibers to the direct metabolites of ATP hydrolysis is not altered by osmotic compression, phosphorylating myosin subunits, or increasing IMP concentration. These factors, therefore, do not explain the discrepancy between intact and skinned fibers during fatigue." @default.
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- W2180043884 date "1997-04-01" @default.
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- W2180043884 title "Response of compressed skinned skeletal muscle fibers to conditions that simulate fatigue" @default.
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- W2180043884 doi "https://doi.org/10.1152/jappl.1997.82.4.1297" @default.
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