Power Spectral Analysis of Heart Rate Variability of Driver Fatigue

This investigation was to evaluate the driving fatigue based on power spectral analysis of heart rate variability (HRV) under vertical vibration. Forty healthy male subjects (29.7±3.5 years) were randomly divided into two groups, Group A (28.8±4.3 years) and Group B (30.6±2.7 years). Group A (experiment group) was required to perform the simulated driving and Group B (control group) kept calm for 90 min. The frequency domain indices of HRV such as low frequency (0.04 0.15 Hz, LF), high frequency (0.150.4 Hz, HF), LF/HF together with the indices of hemodynamics such as blood pressure (BP) and heart rate (HR) of the subjects between both groups were calculated and analyzed after the simulated driving. There were significances of the former indices between both groups (P<0.05). All the data collected after experiment of Group A was observed the remarkable linear correlation (P<0.05) and parameters and errors of their linear regression equation were stated (α=0.05, P<0.001) in this paper, respectively. The present study investigated that sympathetic activity of the subjects enhanced after the simulated driving while parasympathetic activities decreased. The sympathovagal balance was also improved. As autonomic function indictors of HRV reflected fatigue level, quantitative evaluation of driving mental fatigue from physiological reaction could be possible.

优秀女子赛艇运动员高原训练监控

为探讨高原训练对赛艇运动员有氧运动肘力的影响,以女子公开级赛艇运动员为测试对象,测试2 000 m高原训练过程中运动员身体成分、血尿素、血清睾酮、功率、心率、乳酸、乳酸阈功率变化。结果:1)高原训练期间,血红蛋白浓度呈现波浪性变化并呈整体态势逐渐升高。下高原后与上高原前相比,运动员血红蛋白浓度明显升高(p<0.01)。2)高原训练中,体重虽明显下降,但平均体脂%和平均去脂体重变化甚微。3)高原训练初期平均功率-心率曲线对比上高原前出现略微左移,而高原训练后进入平原地带的测试结果对比高原训练初期出现一个较大幅度的右移。4)相对于上山前运动员的乳酸-功率曲线明显右移,显示运动员有氧运动能力提高。结论:高原训练后,Hb含量明显升高,多级测试表明运动员有氧代谢能力得以提高,说明前者可能是后者提高的生理基础;高原缺氧期间体内蛋白质分解加速,故训练期间应采取相应的措施避免由此引起的运动能力降低。