论文部分内容阅读
目的阐明下体负压（ＬＢＮＰ）作用下血压变异性的特征，以及有氧锻炼是否对其有一定影响。方法用常规ＡＲ谱、时变ＡＲ谱、粗粒化谱分析（ＣＧＳＡ）及近似熵（ＡｐＥｎ）四种方法，分析六个月有氧锻炼前、后大学生在两种ＬＢＮＰ作用下的收缩压变异性（ＳＢＰＶ），并与一组中、长跑运动员的结果进行横向比较。结果ＬＢＮＰ作用时，ＳＢＰＶ信号谐波成份的总功率及低频段（ＬＦ）功率增大，分形成份的谱指数（无显著变化，而ＡｐＥｎ则呈持续升高变化。有氧锻炼后，ＬＢＮＰ作用下各种ＳＢＰＶ指标的响应变化较锻炼前并无显著差别。大学生组与运动员组之间亦无显著差别。结论ＳＢＰＶ信号与心率变异性（ＨＲＶ）迥然不同：ＬＢＮＰ作用下，ＳＢＰＶ的ＬＦ成份被进一步激活，信号的复杂度显著升高；但ＳＢＰＶ信号的这种特征性变化并不受有氧锻炼的影响。
Objective To clarify the characteristics of blood pressure variability under lower body negative pressure (LBNP) and whether aerobic exercise has some influence on it. Methods Four kinds of methods including conventional AR, time-varying AR, CGSA and ApEn were used to analyze the change of systolic pressure of undergraduates before and after aerobic exercise for six months (SBPV) and compared horizontally with the results of a group of middle and long distance runners. Results When LBNP was applied, the total power and low frequency (LF) power of harmonic components of SBPV signal increased, and the spectral index of fractal component (no significant change, while ApEn continuously increased and changed.) After aerobic exercise, LBNP There was no significant difference in the response of various SBPV indexes compared with that before exercise.No significant difference was found between the group of college students and the group of athletes.Conclusions The SBVV signal is very different from the heart rate variability (HRV): the LF component of SBPV was Upon further activation, the signal complexity is significantly increased; however, this characteristic change in SBPV signal is not affected by aerobic exercise.