Journal of Applied Physiology AJP: Cell Physiology
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J Appl Physiol 42: 492-500, 1977;
8750-7587/77 $5.00
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Journal of Applied Physiology, Vol 42, Issue 4 492-500, Copyright © 1977 by American Physiological Society

ARTICLES

Effects of body temperature on ventilatory response to hypoxia and breathing pattern in man

E. S. Petersen and H. Vejby-Christensen

The ventilatory response to hypoxia (PAO2 55 and 45 Torr) at each of four levels of PACO2 was studied in five healthy subjects before and after a rise in rectal temperature of 1.4 degrees C had been induced by means of a heated flying suit. At a given level of chemical drive both ventilation and mean inspiratory flow increased after heating, frequency relatively more than tidal volume. In isoventilation comparisons mean inspiratory flow was identical in normo- and hyperthermia, whereas the durations of inspiration (TI) and expiration (TE) were proportionately shortened. It is suggested that a rise in temperature shortens TI by affecting a central "clock" and that TE changes are secondary to changes in end-inspiratory volume. The euoxic CO2 response in hyperthermia was suggestive of multiplication between CO2 and temperature. Hypoxic sensitivity was significantly increased, indicating a temperature effect on the arterial chemoreceptors. The breathing pattern was in either temperature condition identical in euoxia and in hypoxia.


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