Abstract
The effect of an increased body temperature (T r) elicited by prolonged heavy exercise at normal ambient temperature in absence of any heat stress, on the maximal aerobic power (\(\dot V_{O_2 \max } \)) and on heart rate (HR) has been studied. The prolonged exercise consisted in running for 1 hr on a motor driven treadmill, this leading to an average increase of T r of 1.2° C. Oxygen consumption (\(\dot V_{O_2 } \)), ventilation (V I ), HR and T r were measured at rest and every 10 min during the prolonged exercise. Before and after this exercise indirect measurement of \(\dot V_{O_2 \max } \) were made.
After the exercise, HR in submaximal exercise was increased, the increase being less pronounced the heavier the exercise. The HR increment was 17.5 beats/min per 1° C rise in T r in the exercise involving an oxygen comsumption of 22 ml/kg·min and it dropped to 7.5 b/min · °C when the O2 consumption increased to 32.4 ml/kg · · min.
\(\dot V_{O_2 \max } \) as calculated indirectly from HR values in submaximal exercise remained essentially the same before and after the treadmill run.
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This study was conducted during Richard A. Mostardi's tenure as a Post Doctoral Fellow of the National Institute of Health, Heart and Lung Division, No. 1F03 HE 51569-01. Present address: Department of Biology, University of Akron, Akron, Ohio 44304.
This work has been supported in part by a grant from the Italian National Research Council (CNR).
On leave from Department of Physiology, Higher School of Physical Education, Cracow, Poland.
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Mostardi, R., Kubica, R., Veicsteinas, A. et al. The effect of increased body temperature due to exercise on the heart rate and on the maximal aerobic power. Europ. J. Appl. Physiol. 33, 237–245 (1974). https://doi.org/10.1007/BF00421151
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DOI: https://doi.org/10.1007/BF00421151