Accelerometry to measure physical activity in toddlers: Determination of wear time requirements for a reliable estimate of physical activity
Accelerometry to measure physical activity in toddlers: Determination of wear time requirements for a reliable estimate of physical activity
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DOI：
10.1080/02640414.2018.1499391
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发表时间：
2019-02-01
影响因子：
3.4
通讯作者：
Marc, Isabelle
中科院分区：
文献类型：
--
作者：
Bisson, Michele;Tremblay, Florence;Marc, Isabelle
加速度计被广泛用于评估幼儿的身体活动，但需要关于佩戴时间的建议，以了解该年龄组的身体活动行为。本研究旨在确定可靠评估幼儿体力活动的最短佩戴时间。要求3D出生队列的儿童（n = 255，49.8%为男孩，2.1 ± 0.2岁）佩戴加速计（GT 3X+，ActiGraph）7天。体力活动以活动时间（分钟/天）和每分钟计数（CPM）表示。计算单日组内相关系数（ICC），以评估不同最小佩戴时间对可靠性估计值的影响。Spearman-Brown公式用于确定达到70%、80%和90%可靠性水平所需的磨损时间。对于活动时间，佩戴加速度计>= 4天>= 6小时的可靠性为72.1%，占样本的85.9%。对于CPM，>= 4天>= 6小时提供了74.7%的可靠性，包括85.9%的儿童。结果略有不同时，女孩和男孩分别进行分析，但限制分析的儿童与周末没有。总之，最少4天，>= 6小时的加速度数据提供了一个可靠的估计身体活动的2岁幼儿。
Accelerometry is widely used to evaluate physical activity in toddlers however recommendations regarding wear time are needed to understand physical activity behaviours in this age group. This study aimed to determine the minimum wear time to reliably evaluate physical activity in toddlers. Children from the 3D Birth Cohort (n = 255, 49.8% boys, 2.1 +/- 0.2 years) were asked to wear an accelerometer (GT3X+, ActiGraph) for 7 days. Physical activity was expressed in active time (min/day) and counts per minute (CPM). Single day intraclass correlation coefficients (ICCs) were calculated to assess the effect of varying minimal wear time on reliability estimates. The Spearman-Brown formula was used to determine wear time required to achieve reliability levels of 70%, 80% and 90%. For active time, a reliability of 72.1% was achieved with wearing the accelerometer for >= 4 days of >= 6 h, which comprised 85.9% of the sample. For CPM, >= 4 days of >= 6 h provided a reliability of 74.7% and comprised 85.9% of the children. Results differed slightly when girls and boys were analysed separately, but restricting analyses to children with a weekend day did not. In summary, a minimum of 4 days with >= 6 h of accelerometry data provides a reliable estimate of physical activity in 2-year toddlers.