Departamento de Didáctica de las Lenguas, las Artes y el Deporte, Facultad de Ciencias de la Educación, Universidad de Málaga, Málaga, Spain.
Department of Physical Education and Sport, University of Granada, Granada, Spain.
Front Public Health. 2023 Jul 24;11:1211237. doi: 10.3389/fpubh.2023.1211237. eCollection 2023.
The use of activity wristbands to monitor and promote schoolchildren's physical activity (PA) is increasingly widespread. However, their validity has not been sufficiently studied, especially among primary schoolchildren. Consequently, the main purpose was to examine the validity of the daily steps and moderate-to-vigorous PA (MVPA) scores estimated by the activity wristbands Fitbit Ace 2, Garmin Vivofit Jr 2, and the Xiaomi Mi Band 5 in primary schoolchildren under free-living conditions.
An initial sample of 67 schoolchildren (final sample = 62; 50% females), aged 9-12 years old (mean = 10.4 ± 1.0 years), participated in the present study. Each participant wore three activity wristbands (Fitbit Ace 2, Garmin Vivofit Jr 2, and Xiaomi Mi Band 5) on his/her non-dominant wrist and a research-grade accelerometer (ActiGraph wGT3X-BT) on his/her hip as the reference standard (number of steps and time in MVPA) during the waking time of one day.
Results showed that the validity of the daily step scores estimated by the Garmin Vivofit Jr 2 and Xiaomi Mi Band 5 were good and acceptable (e.g., MAPE = 9.6/11.3%, and lower 95% IC of ICC = 0.87/0.73), respectively, as well as correctly classified schoolchildren as meeting or not meeting the daily 10,000/12,000-step-based recommendations, obtaining excellent/good and good/acceptable results (e.g., Garmin Vivofit Jr 2 = 0.75/0.62; Xiaomi Mi Band 5, = 0.73/0.53), respectively. However, the Fitbit Ace 2 did not show an acceptable validity (e.g., daily steps: MAPE = 21.1%, and lower 95% IC of ICC = 0.00; step-based recommendations: = 0.48/0.36). None of the three activity wristbands showed an adequate validity for estimating daily MVPA (e.g., MAPE = 36.6-90.3%, and lower 95% IC of ICC = 0.00-0.41) and the validity for the MVPA-based recommendation tended to be considerably lower (e.g., = -0.03-0.54).
The activity wristband Garmin Vivofit Jr 2 obtained the best validity for monitoring primary schoolchildren's daily steps, offering a feasible alternative to the research-grade accelerometers. Furthermore, this activity wristband could be used during PA promotion programs to provide accurate feedback to primary schoolchildren to ensure their accomplishment with the PA recommendations.
使用活动腕带监测和促进学童的身体活动（PA）越来越普遍。然而，其有效性尚未得到充分研究，尤其是在小学生中。因此，主要目的是在自由生活条件下检查活动腕带 Fitbit Ace 2、Garmin Vivofit Jr 2 和小米 Mi Band 5 估计的日常步数和中等到剧烈 PA（MVPA）得分的有效性。
最初有 67 名学童（最终样本= 62；50%为女性），年龄为 9-12 岁（平均= 10.4±1.0 岁）参加了本研究。每个参与者在一只非优势手腕上佩戴三个活动腕带（Fitbit Ace 2、Garmin Vivofit Jr 2 和小米 Mi Band 5），并在一天的清醒时间内将研究级加速度计（ActiGraph wGT3X-BT）佩戴在臀部作为参考标准（步数和 MVPA 时间）。
结果表明，Garmin Vivofit Jr 2 和小米 Mi Band 5 估计的日常步数得分具有良好和可接受的有效性（例如，平均绝对百分比误差= 9.6/11.3%，较低的 95%置信区间 ICC= 0.87/0.73），并且正确地将学童分类为满足或不满足基于每日 10,000/12,000 步的推荐，获得优秀/良好和良好/可接受的结果（例如，Garmin Vivofit Jr 2 = 0.75/0.62；小米 Mi Band 5，= 0.73/0.53）。然而，Fitbit Ace 2 显示出不可接受的有效性（例如，每日步数：平均绝对百分比误差= 21.1%，较低的 95%置信区间 ICC= 0.00；基于步数的推荐：= 0.48/0.36）。三个活动腕带中没有一个可以准确估计日常 MVPA（例如，平均绝对百分比误差= 36.6-90.3%，较低的 95%置信区间 ICC= 0.00-0.41），MVPA 推荐的有效性往往要低得多（例如，= -0.03-0.54）。
活动腕带 Garmin Vivofit Jr 2 对监测小学生的日常步数具有最佳的有效性，为研究级加速度计提供了可行的替代方案。此外，该活动腕带可用于促进 PA 计划期间，为小学生提供准确的反馈，确保他们完成 PA 推荐。
