Gouveia Élvio R, Gouveia Bruna R, Marques Adilson, Lopes Helder, Rodrigues Ana, Quintal Tomás, Pestana Marcelo, Peralta Miguel, Kliegel Matthias, Ihle Andreas
Department of Physical Education and Sport, University of Madeira, 9020-105 Funchal, Portugal.
LARSYS, Interactive Technologies Institute, 9020-105 Funchal, Portugal.
Children (Basel). 2021 Jan 21;8(2):67. doi: 10.3390/children8020067.
This study aimed to test an observational momentary time sampling tool to estimate in-class moderate-to-vigorous physical activity (MVPA), in terms of validity, reliability and agreement between observational momentary time sampling and accelerometry, and to develop a regression equation to estimate MVPA from observational momentary time sampling. The sample comprised 78 pupils (38 girls), mean age 14.0 ± 1.1 years. Measurements were taken in three similar Physical Education classes, on three different days. To monitor MVPA, we applied the observational momentary time sampling method. Students wore an ActiGraph GT3X+ accelerometer. Reliabilities were determined by the intraclass correlations, the agreement between methods was analyzed using the Bland-Altman method, and a multiple regression analysis was performed to estimate the equation. The observational momentary time sampling showed good reliability across time (0.59 < < 0.72, < 0.001). It was significantly correlated with accelerometry ( = 0.51, < 0.001). The MVPA assessed via accelerometer could be predicted from the following equation: Y = 44.3 + 0.47⋅(MVPA observational momentary time sampling method) + 8.0⋅(sex; with 0 = girls and 1 = boys). This observational momentary time sampling method is a stable and reliable tool to estimate MVPA. A regression equation using the score of observational momentary time sampling and sex can be used to better estimate the real MVPA.
本研究旨在测试一种观察性瞬时时间抽样工具，以评估课堂中度至剧烈身体活动（MVPA），涉及该工具的有效性、可靠性以及观察性瞬时时间抽样与加速度计测量结果之间的一致性，并开发一个回归方程，以便根据观察性瞬时时间抽样来估计MVPA。样本包括78名学生（38名女生），平均年龄14.0±1.1岁。在三个不同日期的三节类似体育课上进行测量。为监测MVPA，我们采用了观察性瞬时时间抽样方法。学生佩戴ActiGraph GT3X+加速度计。通过组内相关性确定可靠性，使用Bland-Altman方法分析两种方法之间的一致性，并进行多元回归分析以估计方程。观察性瞬时时间抽样在不同时间显示出良好的可靠性（0.59＜ICC＜0.72，P＜0.001）。它与加速度计测量结果显著相关（r = 0.51，P＜0.001）。通过加速度计评估的MVPA可由以下方程预测：Y = 44.3 + 0.47·（MVPA观察性瞬时时间抽样方法）+ 8.0·（性别；0 = 女生，1 = 男生）。这种观察性瞬时时间抽样方法是一种稳定可靠的工具，可用于估计MVPA。使用观察性瞬时时间抽样得分和性别的回归方程可用于更好地估计实际的MVPA。
