Time of day affects heart rate recovery and variability after maximal exercise in pre-hypertensive men
Time of day affects heart rate recovery and variability after maximal exercise in pre-hypertensive men
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DOI：
10.3109/07420528.2015.1096277
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发表时间：
2015-01-01
影响因子：
2.8
通讯作者：
Forjaz, Claudia
中科院分区：
文献类型：
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作者：
Brito, Leandro;Pecanha, Tiago;Forjaz, Claudia
心率(HR)恢复(HRR)和运动后变异性(HRV)是用于评估心脏自主神经调节和心血管预后的无创性工具。在健康个体中，晚间锻炼后自主神经恢复慢于晨练，但这种影响在自主神经功能障碍的受试者中未知，尽管它可能影响预后评估。这项研究比较了高血压前期男性早晚最大运动后的心率变异性和运动后心率变异性。10名志愿者随机在早上(上午8点到10点)进行了两次最大运动测试。和晚上(晚上6点到8点)。测定心率恢复-预后指数60 S时心率减幅(HRR60s)、心率短期时间常数T30-副交感神经再激活标志物(T30)、相邻30个S节段R-R间期差值平方和的均方根(rMSSD(30s)-副交感神经再激活标志物)和HRRtau-(交感神经收缩和副交感神经再激活HRR标志物一次指数拟合时间常数)。采用配对t检验和双因素方差分析。早晚运动后HRR60和HRR-相似(27+/-7vs.29+/-7bpm，P=0.111；79+/-14vs.96+/-29 S，p=0.119)。晚间运动后T30显著增加(405+/-215vs.295+/-119vs.295+/-119vs.S，p=0.002)，rMSSD(30s)在晚间运动后显著降低(主因素分析，p=0.009)。总而言之，在高血压前期男性中，HRR的预后指标HRR60s不受一天中锻炼时间的影响。然而，运动后副交感神经的重新激活，由T30和rMSSD(30s)评估，在晚上运动后变得迟钝。
Heart rate (HR) recovery (HRR) and variability (HRV) after exercise are non-invasive tools used to assess cardiac autonomic regulation and cardiovascular prognosis. Autonomic recovery is slower after evening than morning exercise in healthy individuals, but this influence is unknown in subjects with autonomic dysfunction, although it may affect prognostic evaluation. This study compared post-exercise HRR and HRV after maximal morning and evening exercise in pre-hypertensive men. Ten volunteers randomly underwent two maximal exercise tests conducted in the morning (8-10 a. m.) and evening (6-8 p. m.). HRR60s (HR reduction at 60 s of recovery - prognostic index), T30 (short-term time-constant of HRR - parasympathetic reactivation marker), rMSSD(30s) (square root of the mean of the sum of the squares of differences between adjacent R-R intervals on subsequent 30 s segments -parasympathetic reactivation marker), and HRR tau - (time constant of the first order exponential fitting of HRR - marker of sympathetic withdraw and parasympathetic reactivation) were measured. Paired t-test and two-way ANOVA were used. HRR60s and HRR - were similar after exercise in the morning and evening (27 +/- 7 vs. 29 +/- 7 bpm, p = 0.111, and 79 +/- 14 vs. 96 +/- 29 s, p = 0.119, respectively). T30 was significantly greater after evening exercise (405 +/- 215 vs. 295 +/- 119 s, p = 0.002) and rMSSD(30s) was lower in the evening (main factor session, p = 0.009). In conclusion, in pre-hypertensive men, the prognostic index of HRR, HRR60s, is not affected by the time of day when exercise is conducted. However, post-exercise parasympathetic reactivation, evaluated by T30 and rMSSD(30s), is blunted after evening exercise.