Vilaplana J, Madrid J A, Sánchez-Vázquez J, Campuzano A, Cambras T, Díez-Noguera A
Laboratorio Fisiologia, Facultad Farmácia, Universidad Barcelona.
Physiol Behav. 1995 Jul;58(1):9-13. doi: 10.1016/0031-9384(95)00021-a.
The purpose of this work is to test whether physiological factors, such as body weight or food intake, are related to the period of environmental cycles under which animals are kept. We studied body weight increase, daily food intake and efficiency (i.e. relationship between body weight increase and food intake) of 7 groups each containing 20-24 male rats. Measurements were recorded every 4 days from the day of weaning (25 days old) during 64 days. Each group of rats was kept under a symmetrical LD cycle. The period of the cycles studied were: 22, 23, 24, 25, 26, 27 and 28 hours (T22, T23 ... T28). Results show differences in the three variables studied for groups T25 and T26. These animals show an inferior body weight, less food intake and less efficiency. It would seem that the difference between the period of the external LD cycle and the endogenous period of the animals rhythm induces changes in the energetic needs of the organism.
这项工作的目的是测试生理因素，如体重或食物摄入量，是否与动物所处环境周期的时长相关。我们研究了7组雄性大鼠，每组20 - 24只，记录了它们的体重增加、每日食物摄入量和效率（即体重增加与食物摄入量之间的关系）。从断奶日（25日龄）起，每4天进行一次测量，持续64天。每组大鼠均饲养在对称的明暗周期下。所研究的周期时长为：22、23、24、25、26、27和28小时（T22、T23……T28）。结果显示，T25组和T26组在研究的三个变量上存在差异。这些动物体重较低，食物摄入量较少，效率也较低。似乎外部明暗周期的时长与动物节律的内源性周期之间的差异会引起机体能量需求的变化。
