Abstract
Summary
Macaca monkeys attached to an animal board by means of the wrists and ankles with arms and legs extended, in an environment of 38°C and 45% relative humidity, were unable to maintain their temperature equilibrium. The rectal temperature increased steadily to over 43°C in a period of from 3 to 5 hours. When restrained on a wire mesh platform by means of a neck yoke and attachment of the arms along the side of the body, the monkeys held a steady rectal temperature of about 40°C for 5 hours. At a room temperature of 29°C equilibrium of rectal temperature was maintained with both types of restraint with average heart rates over a period of 4.5 hours of 254 for one type and 255 for the other. It is concluded that the manner in which a monkey is restrained can modify its physiological responses during exposure to heat stress.
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