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Tension changes after lengthening of an active striated frog muscle at a slow velocity

892 SOCIkTk BELGE DE PHYSIOLOGIE ET DE PHARMACOLOGIE overshoot the normal values followed by a slow return to normal & LEUSEN,1968). The size of the overshoot is a function of the duration of the application of the high external PCO,. It was also seen in isolated atrial strips of the rabbit that extracellular acidosis depresses the conduction velocity (CV) of the electrical activation and that on increasing the external PCO, the CV after an initial rapid depression also shows a slow recuperation. The time course and relative magnitude of the observed effects on the cardiac parameters could be related to intracellular pH changes as predicted by a model in which the activity of the proton pump is a function of the gradient between [H+]i and [H+],. The model was also found to be useful to predict transient and steady state contractility changes when DMO (20 mM) is added to the external solution. (PANNIER REFERENCES BORON, F. & DE WEER, (1976) J. Gen. Physiol. 67, 91-1 12. W. P. PANNIER,. L. & LEUSEN,. (1968) Arrh. inrernat. Physiol. Biorhim. 76, 624-634. J I THOMAS, C . (1976) J . Physiol (London) 255, 715-735. R. M. JOTTARD and L. PLACHKI (introduced http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Physiology and Biochemistry Informa Healthcare

Tension changes after lengthening of an active striated frog muscle at a slow velocity

Abstract

892 SOCIkTk BELGE DE PHYSIOLOGIE ET DE PHARMACOLOGIE overshoot the normal values followed by a slow return to normal & LEUSEN,1968). The size of the overshoot is a function of the duration of the application of the high external PCO,. It was also seen in isolated atrial strips of the rabbit that extracellular acidosis depresses the conduction velocity (CV) of the electrical activation and that on increasing the external PCO, the CV after an initial rapid depression also shows a slow recuperation. The time course and relative magnitude of the observed effects on the cardiac parameters could be related to intracellular pH changes as predicted by a model in which the activity of the proton pump is a function of the gradient between [H+]i and [H+],. The model was also found to be useful to predict transient and steady state contractility changes when DMO (20 mM) is added to the external solution. (PANNIER REFERENCES BORON, F. & DE WEER, (1976) J. Gen. Physiol. 67, 91-1 12. W. P. PANNIER,. L. & LEUSEN,. (1968) Arrh. inrernat. Physiol. Biorhim. 76, 624-634. J I THOMAS, C . (1976) J . Physiol (London) 255, 715-735. R. M. JOTTARD and L. PLACHKI (introduced
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