Piccione G, Caola G, Refinetti R
Dipartimento di Morfologia, Biochimica, Fisiologia e Produzioni Animali, Facoltà di Medicina Veterinaria, Università degli Studi di Messina, 98168 Messina, Italy.
Comp Biochem Physiol A Mol Integr Physiol. 2005 Dec;142(4):389-96. doi: 10.1016/j.cbpa.2005.07.019. Epub 2005 Nov 14.
Daily or circadian oscillation has been documented in a variety of physiological and behavioral processes. Although individual variables have been studied in great detail, very few studies have been conducted on the temporal relationships between the rhythms of different variables. It is not known whether the circadian pacemaker generates each and every rhythm individually or whether most rhythms are simply derived from a few clock-controlled rhythms. As a first step in elucidating this issue, 21 physiological variables were recorded simultaneously in horse and sheep. The results indicated that, in both species, different variables exhibit different degrees of daily rhythmicity and reach their daily peaks at different times of the day. The variables exhibiting strongest rhythmicity were locomotor activity, rectal temperature, and plasma concentrations of melatonin and glucose. Comparison of rhythmicity and acrophase in the various rhythms allowed inferences to be made about mechanisms of causation.
每日或昼夜节律已在各种生理和行为过程中得到记录。尽管对各个变量进行了详细研究，但关于不同变量节律之间的时间关系的研究却很少。目前尚不清楚昼夜节律起搏器是单独产生每一种节律，还是大多数节律仅仅源自少数受生物钟控制的节律。作为阐明这一问题的第一步，在马和羊身上同时记录了21个生理变量。结果表明，在这两个物种中，不同变量表现出不同程度的每日节律性，并在一天中的不同时间达到每日峰值。表现出最强节律性的变量是运动活动、直肠温度以及褪黑素和葡萄糖的血浆浓度。通过比较各种节律的节律性和峰值相位，可以对因果机制进行推断。
