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      Circadian drinking rhythms in SHR and WKY rats: Effects of increasing light intensity

      Physiology & Behavior
      Elsevier BV

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          Abstract

          This study sought to define the generality of a previous finding that the spontaneously hypertensive (SHR) and normotensive Wistar-Kyoto (WKY) rat strains differ in free-running circadian period when maintained in running-wheel cages under constant light. Circadian drinking rhythms were monitored in SHRs and WKYs housed without access to running wheels under an increasing series of light intensities beginning with constant darkness. Strain differences in circadian period were seen only at relatively high light intensities, indicating that SHRs and WKYs differ in circadian light sensitivity. Since SHRs and WKYs differ in circadian period with or without access to running wheels, this strain difference is not likely to depend on differential locomotor activity levels. SHRs and WKYs also differed in spectral profile and circadian waveform, but only under low light intensities. At higher intensities, dissociation of rhythmicity was seen in both strains.

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          Author and article information

          Journal
          Physiology & Behavior
          Physiology & Behavior
          Elsevier BV
          00319384
          June 1993
          June 1993
          : 53
          : 6
          : 1035-1041
          Article
          10.1016/0031-9384(93)90356-K
          8346285
          b526f6ee-a752-4748-9780-9df214b9b4ac
          © 1993

          https://www.elsevier.com/tdm/userlicense/1.0/

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