Effects of exercise load and breathing frequency on heart rate and blood pressure variability during dynamic exercise
Effects of exercise load and breathing frequency on heart rate and blood pressure variability during dynamic exercise
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DOI：
10.1055/s-2007-971123
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发表时间：
1999-05-01
影响因子：
2.5
通讯作者：
Escourrou, P
中科院分区：
文献类型：
--
作者：
Cottin, F;Papelier, Y;Escourrou, P
心率变异性随着运动负荷的增加而降低，但关于运动负荷对血压变异性的影响的研究很少，呼吸模式的影响也没有被研究。因此，我们通过频谱分析（FFT）研究了9名健康受试者在不同呼吸频率（0.15，0.2，0.3，0.4，0.5，0.6 Hz）下，在休息和3种运动负荷（25，50和75%（V）超过点O（2）max）时的HR和收缩压（SBP）信号。使用非侵入性装置（Finapres）测量血压并连续记录。在低频（LF：0.04-0.128 Hz）和高频（HF：0.128-0.65 Hz），R-R期功率谱随运动负荷的增加而显著降低，但呼吸频率仅在高频部分。SEP的低频和高频功率谱随运动负荷的增加而增大，高频功率谱随呼吸频率的增加而减小。R-R和SEP HF峰值集中在呼吸频率峰值上。因此，HR和SEP的频谱分析证实了运动时迷走神经控制的撤销，而呼吸对SEP的机械作用仍然存在。LF/HF R-R频谱成分的比例随着负荷的增加而降低，而心血管交感神经活动是已知的上升，这表明该比例不是运动期间心血管自主调节的良好指标。
It is known that heart rate (HR) variability decreases with dynamic exercise, but there are only few studies on blood pressure (BP) variability with exercise loads and the effect of breathing pattern has never been investigated. Thus, we studied HR and systolic blood pressure (SBP) signals by spectral analysis (FFT), in 9 healthy subjects, at different breathing frequencies (0.15, 0.2, 0.3, 0.4, 0.5, 0.6 Hz), at rest and during 3 exercise loads (25, 50 and 75 % (V) over dot O(2)max). BP was measured with a non-invasive device (Finapres) and continuously recorded. The power spectrum of R-R period significantly decreased with exercise loads in the low frequency band (LF: 0.04-0.128 Hz) and in the high frequency band (HF: 0.128-0.65 Hz), but with breathing frequency only in the HF part of the spectrum. The power spectrum of SEP significantly increased with exercise loads in LF and HF bands, and decreased in HF band with increasing breathing frequency. R-R and SEP HF peaks were centered on breathing frequency peaks. Therefore, spectral analysis of HR and SEP confirm the withdrawal of vagal control during exercise, while mechanical effect of respiration on SEP persists. LF/HF ratio of R-R spectral components decreased with increasing load, whereas cardiovascular sympathetic activity is known to rise, suggesting that this ratio is not a good indicator of cardiovascular autonomic modulation during exercise.