Dimkpa U, Ibhazehiebo K
Department of Physiology, Faculty of Basic Medical Sciences, Ebonyi State University, Abakiliki, Ebonyi State, Nigeria.
Clin Physiol Funct Imaging. 2009 Jan;29(1):68-73. doi: 10.1111/j.1475-097X.2008.00836.x. Epub 2008 Nov 7.
This study investigated the influence of age on heart rate (HR) decline after exercise in non-athletic adult males. One hundred and fourteen adult males (66 young, 25 +/- 6.26 years; 48 old, 53 +/- 8.54 years) participated in the study. Subjects performed maximum-effort ergometer exercise in incremental stages. HR was measured at rest and continuously monitored during and after exercise. Maximum oxygen uptake (VO(2max)) was measured during the exercise using respiratory gas analyser. Body mass index (BMI) was computed from weight and height measurements, while rating of perceived exertion (RPE) was obtained immediately after the exercise. Results indicated age differences in the rate of HR decline with the young presenting significantly higher %HR decline (P<0.001) than old adults at both levels of recovery. When linearly correlated with age, the rate of HR decline in 1 and 3 min indicated variances of (52%,56%) in young adults, and (54%,49%) in the old adults. After controlling for VO(2max), resting HR, BMI and RPE, the influence of age on rate of HR decline in the two phases of recovery disappeared in young. In the older adult group, it reduced greatly in the 1-min recovery (r(2) = 25%; P = 0.001) and disappeared in the 3-min recovery. Pattern of HR recovery did not differ between the two age groups while age threshold was observed in HR recovery in 1 min. In summary, the influence that age appeared to have on the rate of HR decline could not hold when factors affecting HR recovery were taken into account.
本研究调查了年龄对非运动员成年男性运动后心率（HR）下降的影响。114名成年男性（66名年轻人，年龄25±6.26岁；48名老年人，年龄53±8.54岁）参与了该研究。受试者在递增阶段进行最大努力的测力计运动。在休息时测量心率，并在运动期间和运动后持续监测。在运动期间使用呼吸气体分析仪测量最大摄氧量（VO₂max）。根据体重和身高测量计算身体质量指数（BMI），而运动后立即获得主观用力程度评分（RPE）。结果表明，在两个恢复水平上，年轻人的心率下降率与老年人存在年龄差异，年轻人的心率下降百分比显著更高（P<0.001）。当与年龄进行线性相关分析时，年轻人在1分钟和3分钟时的心率下降率方差分别为（52%，56%），老年人为（54%，49%）。在控制了VO₂max、静息心率、BMI和RPE后，年龄对年轻人恢复两个阶段心率下降率的影响消失。在老年人群体中，在1分钟恢复时影响大幅降低（r² = 25%；P = 0.001），在3分钟恢复时影响消失。两个年龄组的心率恢复模式没有差异，但在1分钟心率恢复中观察到了年龄阈值。总之，当考虑影响心率恢复的因素时，年龄对心率下降率的影响似乎并不成立。
