Actigraph-defined moderate-to-vigorous physical activity cut-off points among children: statistical and biobehavioural relevance

Acta Paediatrica
Comlavi B GuinhouyaHervé Hubert

Abstract

To compare Actigraph-defined moderate-to-vigorous physical activity (MVPA) cutpoints among children, combining statistical and biobehavioural analyses. One hundred and thirteen children aged 10.0 +/- 0.8 years wore accelerometer for three days. The time they spent in MVPA was estimated using 10 thresholds ranged from 3000 to 3900 cpm. A statistical construct including 45 Bland and Altman pairwise analyses was used to compare the 10 estimates of MVPA. A regression was performed to develop an equation relating mean differences to the between-cutpoint gaps. Mean differences in the MVPA estimates ranged from 1.6 to 12.8 min as a function of increment. Raw estimates of MVPA decreased according to an arithmetic sequence with a common difference of 200 cpm. This difference translates into a drop of 12% in MVPA and a misclassification of up to 5% of children. Mean differences (Y) could be predicted from increments (X) using: Y= 0.02 X (R(2)= 0.99, SEE = 0.72, p < 0.0001). When a lack of agreement should be assumed as the between-cutpoint gap exceeds 200 cpm, statistical differences may occur earlier at 90 cpm. Yet, the current equation makes it possible to compare and adjust results from studies/interventions using diverse cutpoints fo...Continue Reading

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Apr 18, 2008·Medicine and Science in Sports and Exercise·Comlavi B Guinhouya, Hervé Hubert

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Citations

Jun 8, 2012·BMC Public Health·Stuart J FaircloughNicola D Ridgers
Dec 22, 2011·The International Journal of Behavioral Nutrition and Physical Activity·Kristjan Thor MagnussonErlingur Johannsson
Mar 29, 2011·The International Journal of Behavioral Nutrition and Physical Activity·Charles S LayneRebecca E Lee
May 17, 2012·PloS One·Kelly A MackintoshNicola D Ridgers
Apr 29, 2011·Journal of Science and Medicine in Sport·Daniel B BornsteinRussell Pate
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Aug 20, 2011·International Journal of Pediatric Obesity : IJPO : an Official Journal of the International Association for the Study of Obesity·Benjamin C GuinhouyaHervé Hubert
Mar 10, 2017·Medicine and Science in Sports and Exercise·Justin B MooreLuis B Sardinha

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