Abstract:
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.
journal_name
Public Health Nutrjournal_title
Public health nutritionauthors
De Meester F,De Bourdeaudhuij I,Deforche B,Ottevaere C,Cardon Gdoi
10.1017/S1368980011001868subject
Has Abstractpub_date
2011-12-01 00:00:00pages
2124-33issue
12eissn
1368-9800issn
1475-2727pii
S1368980011001868journal_volume
14pub_type
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