The effects of wheel deprivation on running were explored. Eight male rats,
well habituated to wheels, were each deprived of wheels for periods of 0,
1, 3, and 10 h during the night (Experiment 1) and 0, 1, 3, and 10 days (Ex
periment 2). In Experiment 1, as wheel deprivation lengthened, wheel runnin
g in the first 24 h of access increased. After 10 days of wheel deprivation
subsequent daily running decreased (by 70%), and feeding was suppressed, f
or several days. This temporary decline may be due to detraining and the ra
ts physical inability to run more. Experiment 3 with 12 rats found that the
running increase after 3-h wheel deprivation was proportional to the amoun
t of running normally occurring during the deprivation period. Over the sho
rt term, running appears to be regulated like other appetitive behaviors. (
C) 1999 Elsevier Science Inc.