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- W2046395087 abstract "In a fatigued muscle fibre, the concentrations of ADP, Pi and H+ are all increased and relaxation is slowed. We have used the technique of laser flash photolysis of the caged calcium-chelator, diazo-2, to investigate the direct effect of changes in pH (pH 6.5, 7.0, 7.5) upon tension during relaxation of single chemically skinned fibres, when the effects of the sarcoplasmic reticulum are absent. The relaxation transients were closely fitted with 2 exponentials, a fast (42.3 ± 1.4; pH 7.0) and a slow process (12.0 ± 0.7; pH 7.0). The fast phase of relaxation was pH sensitive; lowering pH leading to a slowing of the rate of force decline and raising pH leading to an increase of the rate. The rate of the slow phase was unaltered by changing pH over the range investigated. Thus the slowing of relaxation in fatigued muscle may be due, in part, to the direct action of protons on the myofilaments independent of any effects upon the sarcoplasmic reticulum." @default.
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- W2046395087 date "1991-12-01" @default.
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- W2046395087 title "Skeletal muscle relaxation with diazo-2: The effect of altered pH" @default.
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- W2046395087 doi "https://doi.org/10.1016/0006-291x(91)92085-x" @default.
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