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* Corresponding author 1 Department of Epidemiology and Public Health 2 MoveLab— Physical Activity and Exercise Research 3 MRC Centre of Epidemiology for Child Health, Institute of Child Health 4 CESP - Centre de recherche en épidémiologie et santé des populations 5 Centre de Gérontologie

Abstract : The correlation between objective and self-reported measures of physical activity varies between studies. We examined this association and whether it differed by demographic factors or socioeconomic status SES. Data were from 3,975 Whitehall II United Kingdom, 2012-2013 participants aged 60-83 years, who completed a physical activity questionnaire and wore an accelerometer on their wrist for 9 days. There was a moderate correlation between questionnaire- and accelerometer-assessed physical activity Spearman-s r = 0.33, 95% confidence interval: 0.30, 0.36. The correlations were higher in high-SES groups than in low-SES groups P -s = 0.02, as defined by education r = 0.38 vs. r = 0.30 or occupational position r = 0.37 vs. r = 0.29, but did not differ by age, sex, or marital status. Of the self-reported physical activity, 68.3% came from mild activities, 25% from moderate activities, and only 6.7% from vigorous activities, but their correlations with accelerometer-assessed total physical activity were comparable range of r -s, 0.21-0.25. Self-reported physical activity from more energetic activities was more strongly associated with accelerometer data for sports, r = 0.22; for gardening, r = 0.16; for housework, r = 0.09. High-SES persons reported more energetic activities, producing stronger accelerometer associations in these groups. Future studies should identify the aspects of physical activity that are most critical for health; this involves better understanding of the instruments being used.

Keywords : elderly epidemiologic methods physical activity accelerometry cohort studies questionnaires





Autor: Séverine Sabia - Vincent Van Hees - Martin Shipley - Michael Trenell - Gareth Hagger-Johnson - Alexis Elbaz - Mika Kivimaki - Ar

Fuente: https://hal.archives-ouvertes.fr/



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