Measuring physical activity using accelerometry in 13-15-year-old adolescents: the importance of including non-wear activities.


OBJECTIVE:The present study aimed to examine the impact of non-wear activities registered in diaries when using accelerometers to assess physical activity (PA) in young adolescents. DESIGN:Data arise from a large-scale cross-sectional study on PA. PA was objectively assessed using Actigraph™ accelerometers (Actigraph MTI, Manufacturing Technology Inc., Pensacola, FL, USA) during seven consecutive days. Non-wear time activity diaries were provided to register the activities for which the accelerometer was removed. After correction to deal with over-reporting, the registered minutes of PA were used to replace periods of non-wear time measured by the accelerometer. SETTING:Between October 2008 and May 2009 adolescents were recruited by home visits in Ghent (Belgium). SUBJECTS:Young adolescents (n 513; 48·6% boys) aged 13 to 15 years. RESULTS:Of the total sample, 49·9% registered at least one activity of moderate to vigorous intensity in the non-wear time activity diary. More adolescents registered an activity performed on a weekday than on a weekend day and the registered mean number of minutes of moderate to vigorous PA were higher on weekend days. Repeated-measures (M)ANOVA tests revealed a significant difference between the mean minutes with and without non-wear activities for all PA intensities, regardless of adolescents' socio-economic status or gender. More adolescents achieved the PA recommendations after inclusion of the non-wear activities irrespective of accelerometer thresholds used. CONCLUSIONS:The collection of information regarding non-wear time by non-wear time activity diaries when using accelerometers in 13-15-year-old adolescents can lead to different PA outcomes at the individual level and therefore can improve the ability to accurately measure PA.


Public Health Nutr


Public health nutrition


De Meester F,De Bourdeaudhuij I,Deforche B,Ottevaere C,Cardon G




Has Abstract


2011-12-01 00:00:00














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