Epstein L H, Paluch R A, Kalakanis L E, Goldfield G S, Cerny F J, Roemmich J N
Departments of Pediatrics, State University of New York at Buffalo, Buffalo, New York, USA.
Pediatrics. 2001 Sep;108(3):E44. doi: 10.1542/peds.108.3.e44.
Recommendations for adult physical activity have shifted from 20 to 60 minutes of continuous vigorous activity 3 to 5 times a week to accumulation of 30 minutes of moderate to vigorous physical activity most days of the week. Variations of these guidelines also have been suggested for children, based on the idea of accumulating moderate to vigorous physical activity throughout the day, rather than attaining vigorous physical activity in continuous blocks. The goal of this study was to assess accumulated amounts of physical activity at different intensities in children.
We reviewed 26 studies (n = 1883) in youth aged 3 to 17 years that used heart-rate recording to measure physical activity in children to determine accumulated daily activity. Included were studies that provided time being active for at least 2 heart rate intensities at or above 120 beats/minute. Descriptive characteristics of the study groups were determined, and the influence of age, gender, and hours and days of observation on the slope of activity time as a function of percentage of heart rate reserve (HRR) was determined using hierarchical linear regression.
Youth attained 128.0 +/- 45.6, 47.1 +/- 14.9, 29.3 +/- 13.7, and 14.7 +/- 6.0 minutes/day between 20% to 40%, 40% to 50%, 50% to 60%, and greater than 60% HRR, respectively. Age was a significant predictor of the intercept and slope of the physical activity and %HRR relationship.
Youth of all ages attain >60 minutes/day of low-intensity physical activity and approximately 30 minutes/day of activity at traditional cardiovascular fitness training levels of 50% or more of HRR. Recommendations for youth activity are discussed.
针对成年人的体育活动建议已从每周3至5次、每次持续20至60分钟的剧烈活动，转变为每周多数日子累积进行30分钟的中等至剧烈体育活动。基于全天累积中等至剧烈体育活动而非连续进行剧烈体育活动的理念，也有人针对儿童提出了这些指南的不同版本。本研究的目的是评估儿童在不同强度下的体育活动累积量。
我们回顾了26项针对3至17岁青少年的研究（n = 1883），这些研究使用心率记录来测量儿童的体育活动，以确定每日累积活动量。纳入的研究需提供至少两种心率强度在或高于120次/分钟时的活动时间。确定了研究组的描述性特征，并使用分层线性回归确定年龄、性别以及观察时间和天数对活动时间斜率（作为心率储备百分比（HRR）的函数）的影响。
青少年在HRR的20%至40%、40%至50%、50%至60%以及大于60%时，每天分别达到128.0±45.6、47.1±14.9、29.3±13.7和14.7±6.0分钟。年龄是体育活动与%HRR关系的截距和斜率的显著预测因素。
各年龄段的青少年每天进行低强度体育活动的时间超过60分钟，在传统心血管健康训练水平（HRR的50%或更高）下每天约有30分钟的活动时间。讨论了针对青少年活动的建议。
