Melanson E L
Department of Exercise Science, University of Massachusetts, Amherst, USA.
Med Sci Sports Exerc. 2000 Nov;32(11):1894-901. doi: 10.1097/00005768-200011000-00012.
The aims of this study were 1) to assess day-to-day stability of resting heart rate variability (HRV) in healthy adults; 2) to determine whether the reliability of these measures is influenced by self-reported habitual physical activity level; and 3) determine whether the magnitude of HRV is related to self-reported habitual physical activity level.
A resting electrocardiogram was obtained on five consecutive mornings in 37 men (age = 33+/-6 yr) grouped according to their self-reported level of weekly physical activity (LOW, N = 15; MOD, N = 10; HIGH, N = 12). All measurements were obtained while subjects breathed at 10 breaths x min(-1) (0.167 Hz).
HRV was assessed using time and frequency domain measures. Most measures were highly reproducible (R > 0.90) regardless of activity level. After adjusting for differences in age and body mass index, weekly physical activity level was not a significant predictor of any measure of HRV. However, all time and frequency domain measures of HRV tended to be higher in active (MOD and HIGH) compared with inactive (LOW) subjects. No measure of HRV differed between the two most active groups.
Heart rate and HRV are highly reproducible, regardless of physical activity level. Additionally, although time and frequency domain measures of HRV may be greater in active than sedentary individuals, HRV does not appear to be increased in a dose-dependent manner with increasing levels of physical activity.
本研究的目的是：1）评估健康成年人静息心率变异性（HRV）的日常稳定性；2）确定这些测量的可靠性是否受自我报告的习惯性身体活动水平影响；3）确定HRV的大小是否与自我报告的习惯性身体活动水平相关。
对37名男性（年龄 = 33±6岁）连续五个早晨进行静息心电图检查，这些男性根据自我报告的每周身体活动水平分组（低水平组，N = 15；中等水平组，N = 10；高水平组，N = 12）。所有测量均在受试者以每分钟10次呼吸（0.167Hz）呼吸时进行。
使用时域和频域测量方法评估HRV。无论活动水平如何，大多数测量结果都具有高度可重复性（R > 0.90）。在调整年龄和体重指数差异后，每周身体活动水平不是HRV任何测量指标的显著预测因素。然而，与不活动（低水平组）的受试者相比，活动（中等水平组和高水平组）的受试者的所有HRV时域和频域测量值往往更高。两个最活跃组之间的HRV测量指标没有差异。
无论身体活动水平如何，心率和HRV都具有高度可重复性。此外，虽然活动个体的HRV时域和频域测量值可能高于久坐个体，但HRV似乎不会随着身体活动水平的增加而呈剂量依赖性增加。
