Agreement between pedometer and accelerometer in measuring physical activity in overweight and obese pregnant women

BMC Public Health

Research Article

Stephen C Robson¹  Ruth Bell²  Peter WG Tennant²  Tarja I Kinnunen³  Lucilla Poston⁴  Catherine McParlin⁵ 

[1] Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, UK;Institute of Health and Society, Newcastle University, Newcastle upon Tyne, UK;Institute of Health and Society, Newcastle University, Newcastle upon Tyne, UK;Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, UK;School of Health Sciences, University of Tampere, Tampere, Finland;Maternal and Fetal Research Unit, King's College, London, UK;Newcastle upon Tyne Hospitals NHS Trust, Newcastle upon Tyne, UK;

关键词: Physical Activity;    Sedentary Time;    Step Count;    Accelerometer Data;    Accelerometer Measure;   

DOI  :  10.1186/1471-2458-11-501

 received in 2010-10-04, accepted in 2011-06-27,  发布年份 2011

来源: Springer

【 摘 要 】

BackgroundInexpensive, reliable objective methods are needed to measure physical activity (PA) in large scale trials. This study compared the number of pedometer step counts with accelerometer data in pregnant women in free-living conditions to assess agreement between these measures.MethodsPregnant women (n = 58) with body mass index ≥25 kg/m2 at median 13 weeks' gestation wore a GT1M Actigraph accelerometer and a Yamax Digi-Walker CW-701 pedometer for four consecutive days. The Spearman rank correlation coefficients were determined between pedometer step counts and various accelerometer measures of PA. Total agreement between accelerometer and pedometer step counts was evaluated by determining the 95% limits of agreement estimated using a regression-based method. Agreement between the monitors in categorising participants as active or inactive was assessed by determining Kappa.ResultsPedometer step counts correlated moderately (r = 0.36 to 0.54) with most accelerometer measures of PA. Overall step counts recorded by the pedometer and the accelerometer were not significantly different (medians 5961 vs. 5687 steps/day, p = 0.37). However, the 95% limits of agreement ranged from -2690 to 2656 steps/day for the mean step count value (6026 steps/day) and changed substantially over the range of values. Agreement between the monitors in categorising participants to active and inactive varied from moderate to good depending on the criteria adopted.ConclusionsDespite statistically significant correlations and similar median step counts, the overall agreement between pedometer and accelerometer step counts was poor and varied with activity level. Pedometer and accelerometer steps cannot be used interchangeably in overweight and obese pregnant women.

【 授权许可】

Unknown   
© Kinnunen et al; licensee BioMed Central Ltd. 2011. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.