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- W2060134577 abstract "Abstract We studied the effect of different constant light intensities (0.25 lux of dim red light and 4 lux, 40 lux and 500 lux of white light) on the motor activity rhythm of rats. From the day of weaning, rats were kept in individual cages and motor activity was recorded every 15 minutes for 50 days, by a system with two crossed infrared beams. Data were analyzed by means of the periodogram of Sokolove and Bushell and by Fourier analysis. The mean waveform of the rhythm of the adult animals was also calculated and quantified by defining 3 mathematical indices that describe several aspects of the waveform, as noise, stability and abruptness. Under dim red light, the animals show from the beginning of the record a circadian component. In the groups kept under white light, a large number of ultradian components appear during the first days after weaning, and a well defined circadian component appears at about day 10. The waveform that the animals acquire in adulthood depends on the light intensity. The effect of light is manifested by a smoothing of the waveform of the circadian rhythm and by a change from bimodal to unimodal. This effect is gradual, the higher the intensity the stronger the effect. These results are consistent with the hypothesis of a multioscillatory circadian system, in which the coupling between the different oscillators would depend on the light intensity." @default.
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- W2060134577 date "1995-08-01" @default.
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- W2060134577 title "Effects of light intensity on the activity rhythm of young rats" @default.
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- W2060134577 doi "https://doi.org/10.1080/09291019509360344" @default.
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