Reilly T, Brooks G A
Centre for Sport and Exercise Sciences, Liverpool Polytechnic, U.K.
Chronobiol Int. 1990;7(1):59-67. doi: 10.3109/07420529009056955.
An investigation along the circadian time scale in heart rate (HR), rectal temperature (Tr) and metabolic functions at rest, during submaximal and maximal exercise, and post-exercise was conducted using 15 male subjects. Each individual performed a cycle ergometer test on six separate days, temporally placed over the solar day to incorporate equidistant observation points. The exercise tests involved two consecutive 5-min loads at 82 and 147 W, then a graded increase of work-rate every 2 min to exhaustion. Significant circadian rhythms were evident at rest for HR, Tr, VO2 and VE, the HR acrophase at 13:50 hr leading that of the Tr and metabolic variables significantly (P less than or equal to 0.05). The circadian rhythms in metabolic measures were not evident at any exercise level or post-exercise and muscular efficiency was found to be independent of time of day. The exercise tolerance time and blood lactate post-exercise values failed to show a significant rhythm. In contrast the rhythms in HR and Tr were retained with similar phase and amplitude to those at rest during all work rates and post-exercise, though the amplitude of the HR cycle was attenuated at maximum.
对15名男性受试者在静息、次最大运动、最大运动及运动后沿昼夜时间尺度进行心率（HR）、直肠温度（Tr）和代谢功能的研究。每个个体在六个不同的日子进行了一次自行车测力计测试，在太阳日的时间上设置了等距观察点。运动测试包括在82瓦和147瓦下连续进行两个5分钟的负荷，然后每2分钟工作率逐渐增加直至力竭。静息时，HR、Tr、VO2和VE存在明显的昼夜节律，HR的高峰相位在13:50时，显著领先于Tr和代谢变量的高峰相位（P≤0.05）。在任何运动水平或运动后，代谢指标的昼夜节律均不明显，且肌肉效率与一天中的时间无关。运动耐力时间和运动后血乳酸值未显示出明显的节律。相比之下，在所有工作率和运动后，HR和Tr的节律与静息时保持相似的相位和幅度，尽管HR周期的幅度在最大运动时有所衰减。
