Feasibility and validity of the ActiGraph GT3X accelerometer in measuring physical activity of Malawian toddlers
Feasibility and validity of the ActiGraph GT3X accelerometer in measuring physical activity of Malawian toddlers
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DOI：
10.1111/apa.12412
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发表时间：
2013-12-01
期刊：
影响因子：
3.8
通讯作者：
Ashom, P.
中科院分区：
文献类型：
--
作者：
Pulakka, A.;Cheung, Y. B.;Ashom, P.
目的验证ActiGraph GT 3X加速度计测量马拉维农村幼儿身体活动的可行性和有效性。我们分析了佩戴时间至少为600分钟的日子，不包括夜间和连续20分钟记录为零的时间段。第一天和最后一天被排除在外，因为它们不完整。将加速度计计数与编码的自由播放视频记录进行比较，以定义久坐、轻度、中度和剧烈活动的加速度计计数中位数。计数临界点被定义为中度到剧烈的体力活动，预测有效性评估使用第二组video recording.Results中位磨损时间为797分钟/天，与79%的参与者完成至少四个合格的天。观察到的中度至剧烈体力活动的加速度计计数显著高于轻度活动，矢量幅度的临界点为208计数/15秒，垂直轴为35计数/15秒，灵敏度为94.2%和84.1%，特异性为90.9%和84.6%，结论加速度计是评估马拉维幼儿身体活动的可行且有效的方法。
Aim To test the feasibility and validity of the ActiGraph GT3X accelerometer in measuring physical activity of rural Malawian toddlers.Methods Fifty-six children aged 16.0-18.5months wore the accelerometer on their right hip for 7days. We analysed days with a minimum of 600min of wear time, excluding night time and periods when the unit registered zero for 20 consecutive minutes. The first and last days were excluded as they were incomplete. Accelerometer counts were compared with coded free play video recordings to define median accelerometer counts for sedentary, light, moderate and vigorous activity. Count cut points were defined for moderate to vigorous physical activity, with predictive validity assessed using a second set of video recordings.Results Median wear time was 797min/day, with 79% of participants completing at least four eligible days. Accelerometer counts were significantly higher for observed moderate to vigorous physical activity, than lighter activity, with cut points of 208 counts/15sec for vector magnitude and 35 counts/15sec for vertical axis, showing sensitivity of 94.2% and 84.1% and specificity of 90.9% and 84.6%, respectively.Conclusion The accelerometer proved a feasible and valid method of assessing physical activity among Malawian toddlers.