Validity and Calibration of the Youth Activity Profile.
Validity and Calibration of the Youth Activity Profile.
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DOI：
10.1371/journal.pone.0143949
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Welk GJ
中科院分区：
文献类型：
--
作者：
Saint-Maurice PF;Welk GJ
这项研究的目的是校准和交叉验证青年活动概况(YAP)，这是一种自我报告工具，旨在捕获青年的体力活动(PA)和久坐行为(SB)。美国中西部的八所学校参与其中，共有291名4-12年级的参与者同意佩戴加速度计(SWA臂章)，并在两周内(相隔5-7天)完成YAP。单独的YAP项目捕捉一周中特定时段的PA行为，这些项目与SWA对中度到剧烈PA(MVPA)和久坐时间的时间匹配估计相结合，以实现校准。分位数回归程序产生了YAP预测算法，估计了学校的MVPA，校外的MVPA，周末的MVPA，以及在SB度过的时间。YAP对在MVPA和SB花费的时间的估计使用皮尔逊乘积相关性和一致性限度进行交叉验证，作为个体错误的指示，以及等价性检验技术作为小组级别错误的指示。校正后，MVPA的YAP和SWA估计值之间的相关性为低至中等(Rrange=0.19至0.58)，个体水平的MVPA YAP估计值在SWA MVPA值的-134.9%至+110.0%之间。在小组层面，YAP和SWA MVPA的总和MVPA之间的差异从MVPA的-3.4到21.7分钟不等，预测的YAP MVPA估计值分别在学校、校外和周末时段的SWA值的15%、20%和30%以内。对在SB花费的时间的估计彼此高度相关(r=0.75)。SB的个体估计值在SWA久坐时间的-54.0%到+44.0%之间，群体水平的综合估计值相差49.7分钟(在SWA综合估计值的10%以内)。这项研究提供了初步证据，表明校准程序使YAP能够提供与客观监测的MVPA和SB近似值的估计值。YAP提供了一种简单、低成本和教育合理的方法，在群体层面上准确地估计儿童的MVPA和SB。
The purpose of this study was to calibrate and cross-validate the Youth Activity Profile (YAP), a self-report tool designed to capture physical activity (PA) and sedentary behaviors (SB) in youth. Eight schools in the Midwest part of the U.S. were involved and a total of 291 participants from grades 4–12 agreed to wear an accelerometer (SWA Armband) and complete the YAP in two separate weeks (5–7 days apart). Individual YAP items capture PA behavior during specific segments of the week and these items were combined with temporally matched estimates of moderate-to-vigorous PA (MVPA) and sedentary time from the SWA to enable calibration. Quantile regression procedures yielded YAP prediction algorithms that estimated MVPA at School, MVPA at Out-of-School, MVPA on Weekend, as well as time spent in SB. The YAP estimates of time spent in MVPA and SB were cross-validated using Pearson product correlations and limits of agreement, as indicative of individual error and, equivalence testing techniques as indicative of group-level error. Following calibration, the correlations between YAP and SWA estimates of MVPA were low to moderate (rrange = .19 to .58) and individual-level YAP estimates of MVPA ranged from -134.9% to +110.0% of SWA MVPA values. Differences between aggregated YAP and SWA MVPA ranged from -3.4 to 21.7 minutes of MVPA at the group-level and predicted YAP MVPA estimates were within 15%, 20%, and 30%, of values from the SWA for the School, Out-of-School, and Weekend time periods, respectively. Estimates of time spent in SB were highly correlated with each other (r = .75). The individual estimates of SB ranged from -54.0% to +44.0% of SWA sedentary time, and the aggregated group-level estimates differed by 49.7 minutes (within 10% of the SWA aggregated estimates). This study provides preliminary evidence that the calibration procedures enabled the YAP to provide estimates of MVPA and SB that approximated values from an objective monitor. The YAP provides a simple, low-cost and educationally sound method to accurately estimate children’s MVPA and SB at the group level.