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July 18, 1959

MUSCLE WORK AND BODY TEMPERATURE

JAMA. 1959;170(12):1457-1458. doi:10.1001/jama.1959.03010120093022

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Abstract

To the Editor:—  A few years ago an article, by Karpovich, on the subject of warming-up exercises appeared in The Journal (Nov. 17, 1956, pp. 1117-1119). The author recently referred to it in an international publication. The subject is of immense interest to athletes throughout the world and to all those engaged in research in this sphere. Since Karpovich's writings, as well as reports in the Research Quarterly, indicate that certain facts connected with the problem may not be generally known, knowledge of procedures in previous research is of value in further study in this field.About 50 years ago Prof. J. Lindhard, founder of the Copenhagen University Gymnastic Theoretical Laboratory, found that an athlete had a rectal temperature of 40.5 C (104.9 F) immediately after completing a run (Gymnastikteori2:135, 3:288, 1918). Since the "normal" body temperature is 37 C (98.6 F), what was the cause of

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