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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
Accuracy and validity of a combined heart rate and motion sensor for the measurement of free-living physical activity energy expenditure in adults in Cameroon
International Journal of Epidemiology, Volume 40, No. 1, Article dyq098, Year 2011
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Description
Background: The increasing burden of non-communicable diseases in sub-Saharan Africa (SSA) warrants rigorous studies of contributing lifestyle factors. Combined heart rate (HR) and movement monitoring make it possible to objectively measure physical activity in free-living individuals. We examined the validity of a combined HR and motion sensor in estimating physical activity energy expenditure (PAEE) in free-living adults in rural and urban Cameroon compared with doubly-labelled water (DLW) as criterion. Methods: PAEE was measured in 33 free-living rural and urban dwellers by DLW over 7 consecutive days. Simultaneously, the combined sensor recorded HR and uni-axial acceleration. Individual HR vs PAEE calibration was done by a step test. Branched equation modelling was used to estimate PAEE from HR and acceleration. Validity and accuracy of prediction were expressed as mean bias and root mean square error (RMSE). Agreement was analysed using Bland and Altman limits of agreement (LOA). Results: There was no significant mean bias between PAEE estimated from the combined sensor or measured by DLW [mean bias (standard error): -5.4 (5.1) kJ/kg/day; P = 0.3; RMSE = 29.3 kJ/kg/day]. The bias doubled for group compared with individual calibration of HR [-9.1 (5.0) kJ/kg/day, P = 0.08]. PAEE prediction was more accurate in urban compared with rural volunteers. The 95% LOAs between predicted and measured PAEE were ~50-60 kJ/kg/day above or below perfect agreement. Conclusions: Combined HR and movement sensing is a valid method for estimating free-living PAEE on group level in adults in SSA. © The Author 2010. Published by Oxford University Press on behalf of the International Epidemiological Association. All rights reserved.
Authors & Co-Authors
Assah, Felix Kembe
United Kingdom, Cambridge
Addenbrooke's Hospital
Ekelund, Ulf G.
United Kingdom, Cambridge
Addenbrooke's Hospital
Brage, Sören
United Kingdom, Cambridge
Addenbrooke's Hospital
Wright, Antony
United Kingdom, London
Medical Research Council
Mbanya, J. C.
Cameroon, Yaounde
Université de Yaoundé I
Wareham, Nicholas J.
United Kingdom, Cambridge
Addenbrooke's Hospital
Statistics
Citations: 139
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1093/ije/dyq098
ISSN:
03005771
e-ISSN:
14643685
Research Areas
Environmental
Noncommunicable Diseases
Study Locations
Cameroon