Circadian oscillations of three parameters at defined light intensities and color.

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Abstract
The presence in the chicken (Gallus domesticus) of circadian oscillations in deep-body temperature, heart rate, and locomotor activity in white light and in red light (7,000 A and greater) was established by periodogram and correlogram analysis. Changes in amplitude and phase angle were associated with increasing intensity of red light. A relatively rapid (less than 36 hr.) rephasing of deep-body temperature was observed in the red-light environment, following a reversal of the light-dark cycle. In continuous red light the circadian frequency of the 3 variables was not maintained; however, the deep-body temperature oscillations damped out more slowly in this environment than did those of heart rate and locomotor activity.

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