Abstract
The normal rate of O2 consumption of 10 mature male guinea pigs was compared with that produced during the first several days in the novel situation and by sexual satiation and frustration. A higher than normal rate of O2 consumption recorded on the first day was followed by a lower than normal rate on the second and third days. Neither sexual satiation derived from ejaculation nor frustration produced by interrupting the copulatory pattern after the first intromission was found to modify significantly the normal rate of metabolism. In an attempt to explain these results, several hypotheses were suggested based on either the tendency of the guinea pig to crouch when frightened or the nature of the stimuli in the chamber of the metabolism apparatus.
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