Biorhythm A periodic physiological or behavioral change that is controlled by a biological clock. Circadian rhythms are 生物节律：由生物钟控制的周期性的生理上的或行为上的变化。昼夜节律就是一个很好的例子。
Multiple Frequency Biorhythm in Blood Pressure: Its Characteristic and Response to Endogenous and Exogenous Factors血压的多频率生物节律特性及其受内外因素作用变化的机制探讨