Journal of Applied Physiology
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J Appl Physiol 45: 234-237, 1978;
8750-7587/78 $5.00
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Journal of Applied Physiology, Vol 45, Issue 2 234-237, Copyright © 1978 by American Physiological Society

ARTICLES

Relation between oxygen uptake and developed tension in dog skeletal muscle

B. A. Wilson and W. N. Stainsby

Isometric developed tension of in situ gastro-cnemius-plantaris and semitendinosus muscles of the dog was increased 30% with twitch contraction frequency over the range of 0.5--2.0 tw/sc. Developed tension was decreased 75% after 30--40 min of 11--14 tw/s contractions, fatigue. Recovery from fatigue was slow. Intravenously injected K+ after fatigue increased developed tension 50%. Infusions of epinephrine, norepinephrine, and ouabain did not change developed tension. When the oxygen uptake of gastrocnemius-plantaris muscle was measured during twitch contractions at 0.5, 1.0, and 2.0 tw/s before and after fatigue and after injection of K+, the oxygen uptake was found to be directly related to the developed tension.


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