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为研究心肺压力感受器卸荷对人心血管自主神经调节的影响，采用心率变异性（ＨＲＶ）和血压变异性（ＳＢＰＶ和ＤＢＰＶ）谱分析方法考察了在－２ｋＰａ下体负压（ＬＢＮＰ）条件下，心血管自主神经活动水平的变化。结果表明：ＬＢＮＰ作用１～７ｍｉｎ时基础胸阻抗（Ｚｏ）明显升高，心脏每搏量（ＳＶ）明显减少，致使前臂血管阻力（ＦＶＲ）明显增加、血流下降（ＦＢＦ），而心率（ＨＲ）及ＨＲＶ谱参数未发生显著变化，进一步证实了心肺压力感受器对外周血管交感神经和心脏自主神经活动的调节存在机能分化现象；ＬＢＮＰ作用时尽管有外周血管交感神经兴奋现象，但血压变异性谱参数均未发生显著改变，表明这两者在心肺压力感受器卸荷时的变化趋向存在差异。
In order to study the effects of cardiorespiratory baroreflex unloading on cardiovascular autonomic nervous system regulation in human cardiovascular system, heart rate variability (HRV) and blood pressure variability (SBPV and DBPV) Cardiovascular autonomic nervous system activity changes. The results showed that the basal chest impedance (Zo) was significantly increased at 1 ~ 7 min after LBNP treatment, and the stroke volume (SV) decreased significantly, leading to significant increase of forearm vascular resistance (FVR), decrease of blood flow (FBF) ) And HRV spectral parameters did not change significantly, further confirmed that cardiopulmonary baroreceptor peripheral vascular sympathetic nerve and cardiac autonomic nervous system activity regulation exists functional differentiation; LBNP despite the role of peripheral vascular sympathetic excitement, but the blood pressure variability spectrum No significant changes in the parameters, indicating that the two changes in the cardiorespiratory baroreceptors tend to change when there is a difference.