Accelerometer data requirements for reliable estimation of habitual physical activity and sedentary time of children during the early years - a worked example following a stepped approach

作者：Bingham Daniel D^*; Costa Silvia; Clemes Stacy A; Routen Ash C; Moore Helen J; Barber Sally E

来源：Journal of Sports Sciences, 2016, 34(20): 2005-2010.

DOI：10.1080/02640414.2016.1149605

• Acclererometry
• measurement
• reliability
• young children
• physical activity
• sedentary time

This study presents a worked example of a stepped process to reliably estimate the habitual physical activity and sedentary time of a sample of young children. A total of 299 children (2.9 +/- 0.6years) were recruited. Outcome variables were daily minutes of total physical activity, sedentary time, moderate to vigorous physical activity and proportional values of each variable. In total, 282 (94%) provided 3h of accelerometer data on 1 day and were included in a 6-step process: Step-1: determine minimum wear-time; Step-2: process 7-day-data; Step-3: determine the inclusion of a weekend day; Step-4: examine day-to-day variability; Step-5: calculate single day intraclass correlation (ICC) (2,1); Step-6: calculate number of days required to reach reliability. Following the process the results were, Step-1: 6h was estimated as minimum wear-time of a standard day. Step-2: 98 (32%) children had 6h wear on 7 days. Step-3: no differences were found between weekdays and weekend days (P0.05). Step-4: no differences were found between day-to-day variability (P0.05). Step-5: single day ICC's (2,1) ranged from 0.48 (total physical activity and sedentary time) to 0.53 (proportion of moderate to vigorous physical activity). Step-6: to reach reliability (ICC=0.7), 3 days were required for all outcomes. In conclusion following a 7day wear protocol, 6h on any 3 days was found to have acceptable reliability. The stepped-process offers researchers a method to derive sample-specific wear-time criterion.

• 出版日期2016-10