【摘要】 建立了一个同步采样心电和呼吸信号并分析其频谱的系统，可确定Ｒ─Ｒ间期频谱中的呼吸波（高频成分）的位置，对自然呼吸条件下的心率进行变异性分析。对８名受试者在自然呼吸条件下进行了安静、速算、１００Ｗ运动或吸低氧混合气４种状态的Ｒ─Ｒ间期和呼吸频谱分析。速算状态下，中频功率／高频功率（ＭＦ／ＨＦ）、心率、呼吸频率比安静状态下显著增加。说明ＭＦ／ＨＦ对脑力劳动反映敏感；同时还说明了以０．１５～０．５ＨＺ作为高频段分析同一批实验数据没有反映速算状态同安静状态神经活动的差别，同上述结果相比较，说明了正是Ｒ─Ｒ间期中的呼吸波和中频段反映了心血管自主神经系统的活动变化。更多还原

【Abstract】 A system with which ECG and respiratory signals sampled and analyzed syn-chronously was set up.It could recognize the respiratory wave(component of high frequency)in the R-R spectrum,and was used for the analysis of heart rate variability.The spectra of R-R interval and respiratory waves of 8 subjects during quiet sitting,quick calculation,ex-ercise or inspiration of low concentration oxygen with spontanous respiration were analyzed.The power of middle frequency/the power of high frequency(MF/HF),heart rate,and res-piratory frequency increased significantly during quick calculation,as compared with those during quiet sitting.It indicates that MF/HF is sensitive to brain work.It was also demon-strated that when the same experimental data were analyzed with 0.15～0.5 Hz as high fre-quency band of the difference of nervous activities between quick calculation and quiet sitting was not revealed.This suggested that it may be the respiratory wave and the middle frequen-cy band in the R-R interval spectrum that reflect the changes of cardiovascular autonomic nervous activity.更多还原