Tenan Matthew S, Brothers R Matthew, Tweedell Andrew J, Hackney Anthony C, Griffin Lisa
Department of Kinesiology and Health Education, University of Texas at Austin, Austin, Texas, USA; United States Army Research Laboratory-Human Research and Engineering Directorate, Aberdeen Proving Ground, Maryland, USA.
Psychophysiology. 2014 Oct;51(10):996-1004. doi: 10.1111/psyp.12250. Epub 2014 Jun 18.
Heart rate variability (HRV) is a noninvasive indicator of autonomic control. This study examines HRV changes across a normal menstrual cycle and proposes a novel piecewise function controlling for the effects of breathing on HRV spectral parameters. A resting ECG was collected from 13 women at five points in their menstrual cycle. Both heart rate and breathing rate increased across the cycle (p < .01) while time-domain variability decreased (p = .04). Use of the piecewise function for breathing rate in HRV spectral analysis was confirmed by a substantial increase in model goodness-of-fit. HRV spectral parameters, controlled for breathing with the piecewise function, confirm that the decrease in variability is likely due to a parasympathetic withdrawal, since high frequency HRV decreases (p = .02).
心率变异性（HRV）是自主神经控制的一种非侵入性指标。本研究考察了正常月经周期中的HRV变化，并提出了一种新颖的分段函数，用于控制呼吸对HRV频谱参数的影响。在月经周期的五个时间点采集了13名女性的静息心电图。整个周期中心率和呼吸频率均增加（p < 0.01），而时域变异性降低（p = 0.04）。HRV频谱分析中使用分段函数处理呼吸频率，模型拟合优度大幅提高，证实了该函数的有效性。采用分段函数控制呼吸后，HRV频谱参数表明变异性降低可能是由于副交感神经活动减弱，因为高频HRV降低（p = 0.02）。
