摘要
Circadian rhythms are daily oscillations in physiology, metabolism, or behavior that persist in organisms that have been isolated from periodic fluctuations in the environment. Evidence gained in the past several decades has demonstrated that these rhythms are under the control of innate regulatory systems that are based on endogenous, self-sustaining oscillators (or pacemakers) whose periods approximate those of the naturally occurring 24-hour environmental cycles.
摘要译文
昼夜节律是生理学，新陈代谢或行为中的每日振荡，其持续存在于与环境中的周期性波动隔离的生物体中。在过去几十年中获得的证据表明，这些节律受先天调节系统的控制，这些调节系统基于内生的，自我维持的振荡器（或起搏器），其周期接近于自然发生的24小时环境周期。
Terry L. Page. Circadian Rhythms. States of Brain and Mind[M].DE: Springer, 1988: 17-20