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Cross‐validation of Actigraph derived accelerometer cut‐points for assessment of sedentary behaviour and physical activity in children aged 8‐11 years
Author(s) -
Duncan Michael J.,
Eyre Emma L. J.,
Cox Val,
Roscoe Clare M. P.,
Faghy Mark A.,
Tallis Jason,
Dobell Alexandra
Publication year - 2020
Publication title -
acta paediatrica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 115
eISSN - 1651-2227
pISSN - 0803-5253
DOI - 10.1111/apa.15189
Subject(s) - medicine , accelerometer , physical activity , receiver operating characteristic , cut point , cut off , limits of agreement , metabolic equivalent , physical therapy , statistics , mathematics , nuclear medicine , computer science , operating system , power (physics) , physics , quantum mechanics
Aim To cross‐validate previously calibrated Actigraph cut‐points in children. Methods Twenty‐eight children (50% boys) aged between 8 and 11 years of age (9.4 ± 1.4 years) performed a series of 5 minute bouts of activity reflective of different levels of PA from sedentary behaviour (SB) to moderate to vigorous physical activity (MVPA); V ˙ O 2 was assessed using breath‐by‐breath indirect calorimetry, and activity was assessed using Actigraph accelerometers worn on the hip and non‐dominant wrist. The V ˙ O 2 values were then converted into age‐specific METs (measured METs) and coded as SB, light PA and MVPA. Accelerometer data were analysed using previously calibrated cut‐points at different epochs, that is 5, 15, 30 and 60 seconds. Results Receiver operating characteristic (ROC) curve analysis indicated that there was excellent discrimination of SB using the Evenson et al (15 seconds), Romanzini (15 seconds), Treuth et al (30 seconds), Freedson et al (60 seconds), Treuth et al (60 seconds) and Troiano et al (60 seconds) cut‐points. ROC analysis indicated poor discrimination for LPA irrespective of the cut‐points used. Good discrimination of MVPA was evident for all existing cut‐points using a 60‐second epoch. Conclusion There is considerable variation in the performance of existing cut‐points for assessment of SB, LPA and MPA in children.