Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland.
Institute of Biomedicine, School of Medicine, University of Eastern Finland, Kuopio, Finland.
J Sports Sci. 2021 Jun;39(12):1428-1435. doi: 10.1080/02640414.2021.1876328. Epub 2021 Jan 20.
We investigated the associations of age, sex, body size, body composition, and maturity with measures of physical activity (PA) intensity in children. PA intensity was assessed using VOas % of VO or VOat ventilatory threshold (VT), muscle activity measured by textile electromyography, mean amplitude deviation (MAD) measured by accelerometry, and metabolic equivalent of task (MET) during laboratory activities.Age, stature, and muscle mass were inversely associated with VO2 as % of VO and % of VT, during walking or running on a treadmill for 4, 6, and 8 km/h (Spearman r = -0.645 to -0.358). Age was inversely associated with MAD during walking on treadmill for 4 km/h (r = -0.541) and positively associated with MAD during running on a treadmill for 8 km/h, playing hopscotch, and during self-paced running (r = 0.368 to 0.478). Fat mass was positively associated with VO2 as % of VO and VO2 as % of VO2 at VT and waist circumference was positively associated with VO2 as a % of VO and muscle activity during stair climbing (r = 0.416 to 0.519).Fixed accelerometry cut-offs used to define PA intensities should be adjusted for age, sex, body size, and body composition.
我们研究了年龄、性别、体型、身体成分和成熟度与儿童身体活动（PA）强度测量值之间的关联。PA 强度通过 VOas%VO 或 VOat 通气阈值（VT）、通过纺织品肌电图测量的肌肉活动、通过加速度计测量的平均幅度偏差（MAD）以及在实验室活动中的代谢当量（MET）来评估。年龄、身高和肌肉量与在跑步机上以 4、6 和 8km/h 行走或跑步时的 VO2 呈负相关（Spearman r=-0.645 至-0.358）。年龄与在跑步机上以 4km/h 行走时的 MAD 呈负相关（r=-0.541），与在跑步机上以 8km/h、玩跳房子游戏和自我调节跑步时的 MAD 呈正相关（r=0.368 至 0.478）。脂肪量与 VO2 作为 VO 的百分比呈正相关，与 VT 时的 VO2 作为 VO2 的百分比呈正相关，腰围与 VO2 作为 VO 的百分比和爬楼梯时的肌肉活动呈正相关（r=0.416 至 0.519）。用于定义 PA 强度的固定加速度计截止值应根据年龄、性别、体型和身体成分进行调整。
