![]() ![]() Nevertheless, these research-grade accelerometers are usually very expensive instruments, in addition, they are unattractive and not interactive with the users (only the new models present a limited programmable display showing step count and kcals), which make them not very useful to promote adolescents’ PA practice (ActiGraph Corporation, 2021 Šimůnek et al., 2019). These research-grade accelerometers provide information about the intensity, frequency, and volume of PA (Dhurandhar et al., 2015). Among the large number of methods for the assessment of adolescents’ PA levels, research-grade accelerometers (e.g., ActiGraph accelerometers) have been highlighted as the most common and valid method for objectively assessing adolescents’ PA levels during free-living conditions (Romanzini et al., 2014 Van Hecke et al., 2016). However, in order to check the effectiveness of these global policies and monitor their progress, it is necessary to objectively measure adolescents’ PA levels across time (Brooke et al., 2014 Metcalf et al., 2012). Therefore, the promotion of adequate PA levels has been considered a scientific research priority, and a global action plan on PA has been developed to reverse these current trends (WHO, 2018). This is worrying due to physical inactivity being considered a global pandemic, and a leading risk factor for global mortality (WHO, 2020). However, four out of five adolescents aged 11 to 17 do not meet these PA recommendations (Guthold et al., 2020). ( 2021) translated these PA guidelines to a simple and easier-to-understand recommendation for adolescents of 10,000 steps per day. For these reasons, the WHO ( 2020) recommends for adolescents to achieve, on average, at least 60 minutes daily of MVPA throughout the week. Furthermore, daily total physical activity (PA) levels (i.e., sum of minutes at all intensities or step count per day) is also associated with relevant health indicators and quality of life in adolescents (Poitras et al., 2016). ![]() The regular practice of moderate-to-vigorous physical activity (MVPA) is a protective behavior that provides numerous health benefits for adolescents, such as cardiometabolic health, cognitive outcomes or healthy weight (World Health Organization, WHO, 2020). Different models of Xiaomi Mi Band wristbands were comparable and presented good validity for measuring adolescents’ step count, and they accurately classified adolescents as meeting or not meeting the PA recommendations under free-living conditions. Furthermore, comparability between the four Xiaomi Mi Band generations were poor to excellent (ICC, 95% CI = 0.22-0.99, 0.00-1.00) for the daily PA levels outputs, although it was excellent (ICC, 95% CI = 0.99-1.00, 0.96-1.00 MAPE = 0.0-0.1%) for daily step count. Furthermore, the Xiaomi Mi Band wristbands have a good to excellent validity for correctly classifying adolescents as meeting or not meeting the recommended 10,000 steps per day ( P = 0.89-0.95, k = 0.71-0.87) and the recommended 60 minutes of moderate-to-vigorous PA per day ( P = 0.89-0.94, k = 0.69-0.83). However, agreement between daily step count measured by the accelerometer and the Xiaomi Mi Band wristbands were between acceptable (MAPE = 12.2-13.6%) to excellent (ICC, 95% CI = 0.94-0.95, 0.90-0.97). Results showed that the agreement between daily PA levels (i.e., slow, brisk, and slow-brisk pace walking, total PA and moderate-to-vigorous PA) measured by Xiaomi Mi Band wristbands and the accelerometer were poor (ICC, 95% CI = 0.06-0.78, 0.00-0.92 MAPE = 50.1-150.6%). The final sample consisted of 62 high-school students (34 females), aged 12-18 years old (M age = 14.1 ± 1.6 years), who wore an ActiGraph accelerometer on their hip (PA and step count reference measures) and four activity wristbands (Xiaomi Mi Band 2, 3, 4, and 5) on their non-dominant wrist during the waking time of one day. One hundred adolescents were invited to participate in the present study. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.The purpose was to assess the validity of four generations of Xiaomi Mi Band wristbands for the assessment of step count and physical activity (PA) levels among adolescents aged 12-18 years under free-living conditions. ![]() If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. ![]()
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