Skip to content
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
Impact of methodological decisions on accelerometer outcome variables in young children
International Journal of Obesity, Volume 35, Year 2011
Notification
URL copied to clipboard!
Description
Background: The impact of accelerometer-related methodological decisions relating to the assessment of physical activity and sedentary time has not been conclusively determined in young children.Objectives:To determine the effects of epoch and cutoff points on the assessment of physical activity and sedentary time and to determine the accelerometer wear time required to achieve reliable accelerometer data in children. Design: Children were recruited from centres at Ghent, Glasgow, Gothenburg and Zaragoza. Methods: Physical activity was assessed for 1 week in 86 children (41 girls, 45 boys; mean age 7±2 years) by uniaxial accelerometry. The epoch was set at 15 s and reintegrated to 30 and 60 s. Time spent sedentary and in moderate and vigorous physical activity (MVPA) was assessed using a range of cutoff points. Number of days required to achieve 80% reliability was predicted using the Spearman–Brown Prophecy formula.Results:The Reilly cutoff points (< 1100 counts per min (CPM)) indicated less sedentary time per day when comparing 15 vs 30 s and 15 vs 60 s epochs: 570±91 vs 579±93 min and 570±91 vs 579±94 min, respectively; P<0.05. Pate cutoff points (=420 counts per 15 s) reported more MVPA time per day compared with Sirard (890 counts per 15 s) and Puyau cutoff points (=3200 counts per min) using 15 s epoch: 78 (4–197) min (median (range) vs 18 (1–80) min and 24 (1–100) min, respectively; P<0.001. Compliance with guidelines of at least 60 min MVPA was 84, 78 and 73% for Pate cutoff points using 15, 30 and 60 s epochs, respectively, but 0% for Sirard and Puyau cutoff points across epochs. The number of days required to achieve 80% reliability for CPM, sedentary and MVPA time was 7.4–8.5 days.Conclusion:Choice of epoch and cutoff point significantly influenced the classification of sedentary and MVPA time and observed compliance to the MVPA guidelines. © 2010 Macmillan Publishers Limited. All rights reserved.
Authors & Co-Authors
Ojiambo, Robert M.
United Kingdom, Glasgow
University of Glasgow
Kenya, Eldoret
Moi University
Cuthill, R.
United Kingdom, Glasgow
University of Glasgow
Budd, H.
United Kingdom, Glasgow
University of Glasgow
Konstabel, Kenn
Estonia, Tallinn
Tervise Arengu Instituut
Estonia, Tartu
Tartu Ülikool
Casajus, J. A.
Spain, Zaragoza
Universidad de Zaragoza
González-Agüero, A.
Spain, Zaragoza
Universidad de Zaragoza
Anjila, E.
Kenya, Eldoret
Moi University
Reilly, John J.
United Kingdom, Glasgow
University of Glasgow
Easton, Chris
United Kingdom, Kingston Upon Thames
Kingston University
Pitsiladis, Yannis Paul
United Kingdom, Glasgow
University of Glasgow
Kenya, Eldoret
Moi University
Statistics
Citations: 91
Authors: 10
Affiliations: 6
Identifiers
Doi:
10.1038/ijo.2011.40
ISSN:
03070565
e-ISSN:
14765497
Research Areas
Maternal And Child Health
Participants Gender
Male
Female