Abstract
Twenty-four male rats were implanted with radio-transmitters. After recovery, core temperature was monitored with radio-telemetry. Circadian and circaseptan rhythms were analyzed during recovery in rats pretreated with caffeine and in control animals. Data were analyzed using cosinor analysis and comparisons between groups were made with binomial frequency distribution. Fewer rats that received caffeine developed circaseptan rhythms than did control rats suggesting that caffeine reduces circaseptan rhythms following surgery.