Heart rate variability after isocaloric exercise bouts of different intensities
Heart rate variability after isocaloric exercise bouts of different intensities
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DOI：
10.1249/01.mss.0000159139.29220.9a
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发表时间：
2005-04-01
期刊：
影响因子：
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通讯作者：
Lee, CM
中科院分区：
文献类型：
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作者：
Parekh, A;Lee, CM
目的：通过心率变异性(HRV)检测50%(LO)和80%(HI)VO2储备(VO2R)的运动后心脏自主神经调节。方法：13名男性志愿者，年龄：25.7+/-3岁，分别在跑步机上以LO或HI(随机分配)的方式进行运动，每次运动耗费300千卡。在每次访问期间，分别在运动前仰卧位5min和运动后仰卧位恢复30min期间记录心电图。将运动后最后25分钟分为5个5分钟段，仔细观察运动后心率变异性。分析心电图节段的RR间期标准差(SDNN)，频谱分析得到总功率(INTP)、低频功率(INLF)和高频功率(INHF)。低频和高频进一步正常化(LFNU和HFNU)，以更好地量化自主神经平衡。结果。SDNN主要受时间和强度的影响，在伤后15min低于伤前，缺氧后低于伤前。INTP、INLF、INHF、LFNU、HFNU和InLF/INHF存在显著的X-时间交互作用。后分析显示，在HI后20min，INTP和InLF均低于Pre。HL组和LO组INHF分别在25分钟和10分钟内低于治疗前。LFNU和INLF/INHF较高，而HFNU较低，仅在缺氧缺血后15分钟和20-25分钟。结论：50%VO2R运动对心脏自主神经平衡的影响较小，迷走神经调节功能恢复较快。
Purpose: To examine cardiac autonomic modulation, via heart rate variability (HRV), after exercise bouts at 50% (LO) and 80% (HI) of VO2 reserve (VO2R). Methods: Thirteen male volunteers (age: 25.7 +/- 3 yr) exercised on a treadmill at either LO or HI (randomly assigned) on separate days, expending 300 kcal during each bout. During each visit, electrocardiogram (ECG) recordings were obtained during a supine 5-min period before exercise (PRE) and during 30 min of postexercise supine recovery (POST). The last 25 min of POST was divided into five 5-min segments to closely examine postexercise HRV. ECG segments were analyzed for the standard deviation of RR intervals (SDNN), whereas total- (InTP), low- (InLF), and high-frequency (InHF) power were obtained via spectral analysis. LF and HF were further normalized (LFNU and HFNU) to better quantify autonomic balance. Results. There were main effects of time and intensity on SDNN such that it was lower than PRE until 15 min POST, and lower after HI. There were significant intensity X time interactions on InTP, InLF, InHF, LFNU, HFNU, and InLF/InHF. Post hoc analysis revealed that InTP and InLF were lower than PRE up to 20 min POST after HI. InHF was lower than PRE for 25 min POST for HL and for 10 min POST for LO. LFNU and InLF/InHF were greater, whereas HFNU was lower, compared with PRE up to 15 min POST, and from 20-25 min POST for HI only. Conclusion: Exercise at 50% VO2R caused less of a shift in the cardiac autonomic balance, with a quicker restoration of vagal modulation than exercise at 80% VO2R.