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Muscle water and electrolytes following varied levels of dehydration in man

Muscle water and electrolytes following varied levels of dehydration in man Printed in U.S.A. D. L. COSTILL, R. COT& AND W. FINK Human Performance Laboratory, Ball State University, Muncie, Indiana COSTILL, D. L., R. COT& AND W. FINK. Muscle water and varied levels of in man. J. Appl. Physiol. 40(l): 6-11. 1976.-In an effort to assess the effects of on the content of water and (Na+, K+, Cl-, and Mg2+) in plasma and muscle tissue, eight men exercised in the heat (39.5”C, 25%). Blood urine, and muscle biopsy samples were obtained before exercise and after the subjects had reduced their body weight by 2.2, 4.1, and 5.8%. On the average, plasma and muscle water (H,O,) contents were found to decline 2.4 and 1.2% for each percent decrease in body weight. Muscle sodium (Na+,> and chloride (Clm> content remained unchanged with , while muscle magnesium (Mg2+, ) declined 12% as a result of the 5.8% . In terms of intracellular concentrations, K+i increased 7.2 and 10.6% at the 2.2 and 4.1% levels, respectively. Calculations of the resting membrane potential suggest that the water and electrolyte losses observed in these studies do not significantly alter the excitability of the muscle cell membrane. exercise, sweat ; urine ume; extracellular fluid; intracellular ; http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

Muscle water and electrolytes following varied levels of dehydration in man

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Publisher
The American Physiological Society
Copyright
Copyright © 1976 the American Physiological Society
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8750-7587
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1522-1601
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Abstract

Printed in U.S.A. D. L. COSTILL, R. COT& AND W. FINK Human Performance Laboratory, Ball State University, Muncie, Indiana COSTILL, D. L., R. COT& AND W. FINK. Muscle water and varied levels of in man. J. Appl. Physiol. 40(l): 6-11. 1976.-In an effort to assess the effects of on the content of water and (Na+, K+, Cl-, and Mg2+) in plasma and muscle tissue, eight men exercised in the heat (39.5”C, 25%). Blood urine, and muscle biopsy samples were obtained before exercise and after the subjects had reduced their body weight by 2.2, 4.1, and 5.8%. On the average, plasma and muscle water (H,O,) contents were found to decline 2.4 and 1.2% for each percent decrease in body weight. Muscle sodium (Na+,> and chloride (Clm> content remained unchanged with , while muscle magnesium (Mg2+, ) declined 12% as a result of the 5.8% . In terms of intracellular concentrations, K+i increased 7.2 and 10.6% at the 2.2 and 4.1% levels, respectively. Calculations of the resting membrane potential suggest that the water and electrolyte losses observed in these studies do not significantly alter the excitability of the muscle cell membrane. exercise, sweat ; urine ume; extracellular fluid; intracellular ;

Journal

Journal of Applied Physiology – The American Physiological Society

Published: Jan 1, 1976

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