Abstract
Three experiments are reported in which adult male Mongolian gerbils ( Meriones unguiculatus) were subjected to various degrees of partial food deprivation, with or without simultaneous access to a running wheel. Experiment 1 showed that restricted feeding caused drinking to increase and running to decrease, and it offered no support for the idea that running might substitute for drinking. Experiment 2 showed that running declined, and then at least partly recovered, as a function of body weight loss, in gerbils that were not allowed to become hyperdipsic. Experiment 3 showed that drinking remained at a high level during prolonged exposure to restricted feeding, but reverted to baseline level more rapidly than did body weight when free feeding was reinstated. The results do not support the idea that drinking and running are interchangeable members of a set of activities facilitated by food deprivation, and they show that neither drinking nor running is related to degree of body weight loss in a simple manner.
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