Effects of activity on the rate of barpressing by rats

Abstract

Rat, ,.kpri\'t.~d of 10' and 2OC; of their body weights and allowed to run in activity wheels immediately preceding a lI:,t ,~"ion in a small rodent tcst "hamber pressed a bar less frequently than comparably deprived rats not allowed to run in th~ whccls. Thc rcsults support the hypothesis that running is an attempt by food-deprived rats to regulate an impalan,'c in a homeostati.: mechanism(s) resulting from the deprivation of food .