Freitas J, Lago P, Puig J, Carvalho M J, Costa O, de Freitas A F
Centro de Medicina Desportiva do Norte, Centro de Estudos da Função Autonómica Corino Andrade, and Departamento de Matematica Aplicada, Oporto University, Portugal.
J Electrocardiol. 1997 Jan;30(1):39-44. doi: 10.1016/s0022-0736(97)80033-7.
The objective of this study was to assess the influence of day-night cycle and sleep-awake period on the circadian pattern of heart rate variability (HRV). Twelve male oil refinery security shift workers, aged 39 +/- 7 years, were studied with 24-hour Holter monitor recordings during morning and night work periods. Hourly HRV parameters in the time and frequency domains were evaluated. For both shifts, all HRV parameters during awake or work periods were found not to be statistically different. In both day and night work shifts, the very low frequency and high-frequency components of HRV and the proportion of differences in successive R-R intervals greater than 50 ms increased during the sleep period, while the low frequency/high frequency ratio decreased. The low-frequency component in absolute units and the SD of the R-R interval did not show any variation in either shifts for the different periods. These results suggest that the circadian pattern of HRV seems to be predominantly related to sleep (supine) and wakefulness (standing) and remains independent of night-day cycle.
本研究的目的是评估昼夜周期和睡眠-清醒期对心率变异性（HRV）昼夜模式的影响。对12名年龄在39±7岁的男性炼油厂保安轮班工人，在早班和夜班工作期间进行24小时动态心电图监测记录研究。评估了时域和频域中的每小时HRV参数。对于两个班次，发现清醒或工作期间的所有HRV参数在统计学上无差异。在白班和夜班工作中，HRV的极低频和高频成分以及连续R-R间期差异大于50 ms的比例在睡眠期间增加，而低频/高频比值降低。绝对单位的低频成分和R-R间期的标准差在两个班次的不同时间段均未显示任何变化。这些结果表明，HRV的昼夜模式似乎主要与睡眠（仰卧）和清醒（站立）有关，并且与昼夜周期无关。
