Levels of physical activity among a nationally representative sample of people in early old age: results of objective an
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RESEARCH
Open Access
Levels of physical activity among a nationally representative sample of people in early old age: results of objective and self-reported assessments Rajna Golubic1*, Kathryn R Martin2,3,4, Ulf Ekelund1,5, Rebecca Hardy2, Diana Kuh2, Nicholas Wareham1, Rachel Cooper2, Soren Brage1 and On behalf of the NSHD scientific and data collection teams
Abstract Background: Detailed assessment of physical activity (PA) in older adults is required to comprehensively describe habitual PA-levels in this growing population segment. Current evidence of population PA-levels is predominantly based on self-report. Methods: We examined PA and sedentary behaviour in a nationally representative sample of British people aged 60–64, using individually-calibrated combined heart-rate and movement sensing and a validated questionnaire (EPAQ2), and the socio-demographic and behavioural factors that may explain between-individual variation in PA. Results: Between 2006–2010, 2224 participants completed EPAQ2 capturing the past year’s activity in four domains (leisure, work, transportation and domestic life) and 1787 participants provided 2–5 days of combined-sensing data. According to objective estimates, median(IQR) physical activity energy expenditure (PAEE) was 33.5 (25.3-42.2) and 35.5 (26.6- 47.3) kJ/kg/day for women and men, respectively. Median (IQR) time spent in moderate-to-vigorous PA (MVPA; >3MET), light-intensity PA (1.5-3 MET) and sedentary (30 min MVPA per day combined with >60 min strength-training per week. Conclusions: The use of both self-report and objective monitoring to assess PA in early old age provides important information on the domains of PA, PAEE and time spent at different intensity levels. Our findings suggest PA levels are generally low and observed patterns of variation indicate specific subgroups who might benefit from targeted interventions to increase PA. Keywords: Physical activity, Sedentary behaviour, Physical activity questionnaire, Combined sensing, Birth cohort, Old age
* Correspondence: [email protected] 1 Medical Research Council Epidemiology Unit, University of Cambridge, Institute of Metabolic Science, Box 285, Addenbrooke’s Hospital, Hills Road, Cambridge CB2 0QQ, United Kingdom Full list of author information is available at the end of the article © 2014 Golubic et al.; licensee 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 credited.
Golubic et al. International Journal of Behavioral Nutrition and Physical Activity 2014, 11:58 http://www.ijbnpa.org/content/11/1/58
Introduction Population ageing poses a major public health challenge owing to its impact on healthcare demands arising from chronic diseases and disabilities [1]. The ratio of workers to retired people in the EU is projected to fall from 3:1 in 2004 to 1:1 in 205
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