Cross-Generational Comparability of Raw and Count-Based Metrics from ActiGraph GT9X and wGT3X-BT Accelerometers during Free-Living in Youth

被引:21
作者
Clevenger, Kimberly A. [1 ]
Pfeiffer, Karin A. [1 ]
Montoye, Alexander H. K. [2 ]
机构
[1] Michigan State Univ, Dept Kinesiol, E Lansing, MI 48824 USA
[2] Alma Coll, Dept Integrat Physiol & Hlth Sci, Alma, MI USA
关键词
Monitor; ENMO; activity; measurement; MAD; PHYSICAL-ACTIVITY; ACTIVITY MONITORS; CALIBRATION; CHILDREN; WRIST; GT1M; HIP; VALIDATION; WORN; GT3X;
D O I
10.1080/1091367X.2020.1773827
中图分类号
G40 [教育学];
学科分类号
040101 ; 120403 ;
摘要
Free-living comparability of wGT3X-BT and GT9X ActiGraphs has not been verified. Participants (n = 34, 35% females, 7-17 y) wore hip-worn monitors for one week. Vector magnitude (VM; 15-s epoch), Mean Amplitude Deviation (MAD) and Euclidean Norm Minus One (ENMO) (5-s epoch), and percent of time spent in each activity intensity (using cut-points) were calculated. At the epoch-level, correlations were strong (r = 0.822-0.963), mean absolute percent difference (MAPD) was 41.5 +/- 62.2% (VM), 40.8 +/- 52.7% (MAD), and 110.9 +/- 74.0%, with moderate (ENMO kappa = 0.664-0.789) to strong (VM kappa = 0.915) agreement for activity intensity. When collapsed to the individual level, MAPD was 4.2 +/- 3.4% (VM), 6.8 +/- 3.7% (MAD), and 35.9 +/- 26.1% (ENMO), correlations were moderate (ENMOr= 0.618) to high (MAD and VMr= 0.996), but ENMO, MAD, and time spent in activity intensities using ENMO cut-points were not statistically equivalent (using 2 one-sided tests) between monitors. While time spent in activity intensities was often comparable between models, caution is warranted for epoch-level comparisons.
引用
收藏
页码:194 / 204
页数:11
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