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Science 8 January 1965:
Vol. 147. no. 3654, pp. 162 - 163
DOI: 10.1126/science.147.3654.162
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Articles

Activation Heat in Muscle: Method for Determination

C. L. Gibbs 1 and N. V. Ricchiuti 1

1 Department of Medicine, Los Angeles County Heart Association Cardiovascular Research Laboratory, University of California, Los Angeles

By varying the interval between two stimuli it is possible to measure the activation heat in a skeletal muscle twitch. The method depends upon finding a range of stimulus intervals where complete mechanical fusion exists and where there is a plateau in the heat production. At 0°C, and when muscles are at normal body length, activation heat represents about 40 percent of the heat in an isometric twitch.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)