Abstract
Exposure for 1 h to a hypoxic atmosphere containing 11.4% oxygen lowers the gas exchange and the rectal temperature in rats, but the electrical activity of their muscles remains almost unchanged. In an atmosphere containing 7.4% oxygen, besides a decrease in gas exchange to the same level, depression of the thermoregulatory tone of the muscles and a more marked decrease of body temperature are observed. After transfer of the animals from the hypoxic atmosphere to ordinary air, within the course of 1 h in the first case the gas exchange and body temperature rise but do not regain the control level, while in the second case the electrical activity of the muscles returns to normal, the body temperature rises slightly, but the gas exchange remains depressed.
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