【摘要】 目的探索运动、昼夜节律和呼吸对心率变异性的影响。方法2000-01/2000-02从第三军医大学西南医院门诊收集34名自愿受试者,于清晨5h和下午5h、运动前后分别记录心动周期信号,并测量和分析。用相继各心动周期的标准差(SDNN)作为心率变异性的一个指标。结果10名受试者清晨5h和下午5h心率变异性指标SDNN的均值分别为30ms和29ms,而清晨5h和下午5h两组心动周期数据汇成一组时的SDNN增大至262ms;34名受试者运动前SDNN的均值为18ms,运动后的SDNN的均值为10ms,受试者运动前后心率变异性的差异非常显著(t=6.049,P<0.01);呼吸周期I内的心动周期最大差值与呼吸周期J内的心动周期最大差值之间的差异不显著(t=0.024,P>0.05)。结论长时程(24h)心率变异性指标SDNN的正常值(141±39)ms的基础之一是心动周期的昼夜差;运动是影响心率变异性的重要因素;呼吸对心率变异性有一定的影响,但其大小次于心动周期的昼夜差对心率变异性的影响。更多还原

【Abstract】 Aim To explore the influence of exercise , day night rhythm, and respiration on heart rate variability (HRV).Methods Thirty four voluntary subjects from a community in Chongqing City in 2000, were included in this self controlled study. HRV signals at 5 am and 5 pm, at rest and after exercise , were recorded, measured, and analyzed , respectively. The standard deviation of consecutive cardiac cycles￡¨SDNN￡(c)was used as an indicator of HRV. Results The 10 subjects’ mean SDNNs at 5 am and 5 pm were 30 ms and 29 ms,respectively, whereas when the two sets of cardiac cycle data at 5 am and 5 pm were merged as one dataset, the SDNN increased to 262 ms; for 34 subjects, mean SDNN before exercise was 18 ms, and mean SDNN after exercise was 10 ms, in comparison of SDNN before exercise with that after exercise, the difference was significant (t=6.049, P< 0.01); the difference between the mean value of the maximal cardiac cycle difference in respiratory cycle I and that in cycle J was not significant (t=0.024, P >0.05). Conclusion One of the bases of the normal value (141±39)ms of SDNN from 24 hours HRV recording is day night variations of cardiac cycle?SDNN after exercise is decreased, exercise is an important factor influencing HRV?respiration has a certain influence on HRV but this influence is less than that of day night variations of cardiac cycle. The method used in this study can simultaneously collect and record cardiac contractility and cardiac cycle signals, which might be a tool for analyzing HRV.更多还原