Laboratoire RELACS, Université du Littoral Côte d'Opale, Dunkerque.
J Sports Sci. 2010 Feb;28(4):375-9. doi: 10.1080/02640410903502790.
The aim of this study was to assess the reliability of the RT3 accelerometer under conditions of normal physical activity. Sixty healthy individuals (30 boys, 30 girls) aged 10-16 years wore two accelerometers while performing different structured physical activities. The accelerometers were synchronized and data were recorded every minute during nine 15-min sessions of physical activity that varied in intensity from sedentary (watching television, playing video games) to vigorous (running on a treadmill at different speeds). Intra-instrument coefficients of variation (CV) were assessed using the formula CV = standard deviation of the measure x 100/mean of the measure. The intra-instrument coefficient of variation was higher for sedentary (17%) and light activity (16.2%) than moderate (9.3%) and vigorous activity (6.6%). These results confirmed the poor reliability of the RT3 for activity of low magnitude and frequency that was demonstrated in studies using a shaker.
本研究旨在评估 RT3 加速度计在正常体力活动条件下的可靠性。60 名健康个体（30 名男孩，30 名女孩）佩戴两个加速度计，同时进行不同的结构化体力活动。加速度计同步，在 9 个 15 分钟的体力活动期间，每 1 分钟记录一次数据，活动强度从静坐（看电视、玩电子游戏）到剧烈（在不同速度的跑步机上跑步）不等。使用公式 CV = 测量的标准差 x 100/测量的平均值来评估仪器内的变异系数 (CV)。仪器内的 CV 对于静坐（17%）和低强度活动（16.2%）高于中等强度（9.3%）和剧烈活动（6.6%）。这些结果证实了 RT3 在使用振动器进行的研究中表现出的低幅度和低频率活动的可靠性较差。
