Richard Pulsford|Mario Cortina?Borja|Carly Rich|Florence?Emilie Kinnafick|Carol Dezateux|Lucy Griffiths
Actigraph Accelerometer-Defined Boundaries for Sedentary Behaviour and Physical Activity Intensities in 7 Year Old Children
University of Exeter|Medical Research Council|University College London|Medical Research Council|University College London|University of Birmingham|Medical Research Council|University College London|Medical Research Council|University College London
accurate objective assessment sedentary physical activity behaviours childhood integral understanding relation later health outcomes well documenting frequency distribution physical activity within populationto calibrate actigraph gt1m accelerometer using energy expenditure ee criterion measure define thresholds sedentary behaviour physical activity categories suitable use large scale epidemiological study young childrenaccelerometerbased assessments physical activity counts per minute calibrated ee measures kcal x kg1 x hr1 obtained range exercise intensities using cosmed k4b2 portable metabolic unit 53 sevenyearold children children performed seven activities lying viewing television sitting upright playing computer game slow walking brisk walking jogging hopscotch basketball threshold count values established identify sedentary behaviour light moderate vigorous physical activity using linear discriminant analysis lda evaluated using receiver operating characteristic roc curve analysisee significantly associated counts nonsedentary activities exception jogging threshold values accelerometer counts counts x minute1 100 sedentary behaviour 2240 3840 3841 light moderate vigorous physical activity respectively area roc curves discrimination sedentary behaviour vigorous activity 098 boundaries light moderate physical activity less well defined 061 060 respectively sensitivity specificity higher sedentary 99 97 vigorous 95 91 light 60 83 moderate 61 76 thresholdsthe accelerometer cut points established study used classify sedentary behaviour distinguish light moderate vigorous physical activity children age