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Effect of Spontaneous Activity on Response to Intermittent Feeding¹

Department of Physiology, University of Rochester School of Medicine and Dentistry, Rochester, New York

In earlier studies, weanling rats fed intermittently were found to ingest less food and accumulate more body fat but less nitrogen than control animals fed ad libitum. In adult animals, only food intake differences developed. The response of animals housed in cages with attached running wheels to these feeding schedules was examined and compared with that of conventionally housed animals. When activity was allowed, intermittently fed weanling, but not adult, rats were significantly more active than control animals. The food intake and body compositional differences characteristic of conventionally housed weanling rats, did not develop. In adult animals housed in activity cages, also unlike findings with conventional housing, food intake was not modified by the feeding schedule. Intermittently fed animals housed in activity cages increased food intake significantly more during periods of unrestricted feeding than did those housed conventionally. When food intake equaled that of control animals body compositional differences did not develop in the weanling animals.

² Current address: National Institutes of Nutrition, Baghdad, Iraq.

Manuscript received 13 January 1969.