Rosenwasser A M, Boulos Z, Terman M
Physiol Behav. 1983 Mar;30(3):353-9. doi: 10.1016/0031-9384(83)90138-5.
Feeding and drinking rhythms were studied in rats maintained under 24-hr light-dark (LD) cycles with various photoperiods, under two-pulse (2P) and one-pulse (1P) skeleton photoperiods, and under constant dark (DD). Rhythmic waveforms were similar under complete LD cycles and corresponding skeleton photoperiods, indicating that these rhythms mainly reflect the entrainment of underlying circadian pacemakers. Little or no role was found for masking effects of light on circadian feeding and drinking waveforms. Entrainment was found to depend mainly on the timing of the dawn light signal, whether it was a 15-min light pulse or a dark-to-light transition initiating a complete photoperiod. Furthermore, the use of 1P schedules revealed that a dawn signal was sufficient for entrainment. These results closely match those obtained for motor activity measures in other nocturnal rodent species, and generally conform to the predictions of Pittendrigh's nonparametric theory of entrainment. Furthermore, the close correspondence of the two rhythms during entrainment, phase-jumps, and free-running (DD) conditions indicates that they are controlled by common circadian pacemakers.
在具有不同光周期的24小时明暗（LD）循环、双脉冲（2P）和单脉冲（1P）骨架光周期以及持续黑暗（DD）条件下饲养的大鼠中，研究了进食和饮水节律。在完整的LD循环和相应的骨架光周期下，节律波形相似，这表明这些节律主要反映了潜在昼夜节律起搏器的同步化。未发现光对昼夜进食和饮水波形的掩盖效应有显著作用。发现同步化主要取决于黎明光信号的时间，无论它是15分钟的光脉冲还是启动完整光周期的从黑暗到光明的转变。此外，使用1P时间表表明，黎明信号足以实现同步化。这些结果与在其他夜行性啮齿动物物种中获得的运动活动测量结果密切匹配，并且总体上符合皮特恩德里希非参数同步化理论的预测。此外，在同步化、相位跳跃和自由运行（DD）条件下两种节律的紧密对应表明它们由共同的昼夜节律起搏器控制。
