Circadian variations in psychophysiological responses to heat exposure and exercise |
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Authors: | Barbara Zahorska-Markiewicz Maciej D?bowski Franciszek M Spioch Jan Zejda Antoni Sikora Andrzej Markiewicz |
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Institution: | (1) Department of Physiology, Institute of Occupational Medicine, ul. Bieruta 12, PL-41-200 Sosnowiec, Poland;(2) Department of Physiology, Silesian School of Medicine, 3 District Railway Hospital, Katowice, Poland |
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Abstract: | Summary Ten healthy men were tested at 0600, 1200, 1800 and 2400 hours on different days at rest in a laboratory at room temperature
followed by 1 h of heat exposure in a climatic chamber at 42° C, 60% rh (50 min rest and 10 min exercise on a cycle ergometer
at 50%
). Heart rate, blood pressure, rectal temperatureT
re, metabolic rate, number connection test, visual and auditory reaction time, flicker test and catecholamine excretion were
measured. Heat exposure and exercise caused lower heart rate acceleration at 2400 hours than at 0600 and 1200 hours, the smallest
increase ofT
re at 1800 hours, and an increase in metabolic rate greater at 1200 than at 1800 hours. In the afternoon, when, according to
the circadian rhythm, the body temperature is highest, the additional heat load produced the smallest physiological effects.
Performance efficiency, after heat exposure combined with physical exercise, improved slightly, but diurnal variations did
not show significant circadian rhythm.
The work was supported from Poland's Central Programme of Basic Research 06-02.III.2.2 |
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Keywords: | Circadian variations Heat exposure Metabolic rate Performance tests |
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