Spectral analysis of heart rate variability during exercise in trained subjects

被引:83
作者
Pichon, AP
De Bisschop, C
Roulaud, M
Denjean, A
Papelier, Y
机构
[1] Sch Sports Sci, Lab Exercise Induced Physiol Adaptat, F-86000 Poitiers, France
[2] Univ Poitiers Hosp, Resp & Exercise Physiol Dept, Poitiers, France
[3] Hop Antoine Beclere, Kremlin Bicetre Med Sch, Physiol & Sleep Dept, Clamart, France
关键词
autonomic nervous system; dynamic exercise; Fourier transform; breathing frequency;
D O I
10.1249/01.MSS.0000142403.93205.35
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
Purpose: To investigate the effects of strenuous exercise on heart rate variability (HRV). Methods: We evaluated the effects of exercise intensity and duration on HRV indices in 14 healthy trained subjects. Each subject exercised for 3, 6, and 9 min at 60 and 70% of the power achieved at maximal oxygen consumption (P(V) over dot O-2max) and for 3 and 6 min (or 3 min twice) at 80% of P(V) over dot O-2max. The electrocardiogram RR intervals were recorded then processed by fast (FFT) and short-time (STFT) Fourier transform for determination of low-frequency (LF, 0.045-0.15 Hz) and high-frequency (HF, 0.15-1.0 Hz) components. Results: The LF and HF components expressed as absolute power (ms(2)) decreased significantly at the onset of exercise (P < 0.05). However, with increasing exercise intensity, the HF component expressed as normalized units (n.u.) (reflecting parasympathetic modulation) increased significantly, whereas the LF component (n.u.) and LF/HF ratio (both reflecting sympathetic modulation) decreased significantly (P < 0.05). STFT showed that increasing exercise intensity was associated with a shift in HF peak frequency related to an increase in respiratory rate and a marked decrease in LF power (ms(2)). Moreover, HFn.u. rose (r = 0.918, P < 0.01) and LFms(2) fell as minute ventilation increased (r = 0.906, P < 0.01). Conclusions: Parasympathetic respiratory control and nonautonomic mechanisms may influence the HF-peak shift during strenuous exercise. HRV and the usual indexes of sympathetic activity do not accurately reflect changes in autonomic modulation during exhaustive exercise.
引用
收藏
页码:1702 / 1708
页数:7
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