Summary
9 young normal subjects were studied during two types of prolonged intermittent exercise requiring periods of heavy work (12 min at 80%\(\dot V_{O_2 }\) max.) alternating with intervening rest periods (for 18 min) in first type and light work (18 min about 40%\(\dot V_{O_2 }\) max.) in second type. In a third experiment, heavy exercise was repeated after 1 hr of rest and followed by light exercise. Hemodynamic variables and body temperature (oesophageal) were measured sequentially.
Prolonged intermittent work was characterized by progressive increase in heart rate, fall in stroke volume and mean brachial pressure while cardiac output remained constant. These variations occurred more rapidly when rest periods were replaced by light work. They were attended by a progressive rise in body temperature. Heart rate closely correlated with oesophageal temperature during prolonged intermittent exercise (r from 0.90 to 0.96). When resting period was extended to 1 hr, subsequent heavy exercise initiates the same hemodynamic and temperature responses. After heavy exercise, light exercise was performed with higher heart rate and oesophageal temperature and lower stroke volume.
Drift in body temperature with prolonged intermittent exercise could be partly responsible for hemodynamic changes by means of redistribution of blood volume and flow to the skin.
Relationship between exercise body temperature and percentage of\(\dot V_{O_2 }\) max. is modified by repeating exercise after a short recovery period.
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This investigation was supported by a grant from the European Community for Coal and Steel (6242-22-55/56).
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Detry, JM.R., Gerin, M.G., Charlier, A.A. et al. Hemodynamic and thermal aspects of prolonged intermittent exercise. Int. Z. Angew. Physiol. Einschl. Arbeitsphysiol. 30, 171–185 (1972). https://doi.org/10.1007/BF00699118
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DOI: https://doi.org/10.1007/BF00699118