Information on population-based and community-dwelling physical activity (PA) has predominantly been collected through the administration of self-report questionnaires. Conclusions: These findings suggest that the YFS PA questionnaire showed acceptable convergent validity in assessing, in particular, exercise-type PA in an adult population. Of the individual items in the questionnaire, questions that described the frequency of PA and the duration of vigorous PA correlated the most strongly with the pedometer values obtained for total and aerobic steps ( r = 0.28 - 0.44, p ≤ 0.010). An association was not observed between pedometer data and habitual PA. Results: There was a low to moderate association between the self-reported questionnaire and pedometer measurements regarding both total steps and aerobic steps taken during leisure time and commuting PA. The participants wore a pedometer for seven consecutive days and used it to record their total daily and aerobic steps. PA was expressed as leisure-time physical activity index (PAI) and metabolic equivalent hours/week (METh/wk). The participants completed a self-reported questionnaire that included items on leisure time, commuting and habitual PA. Methods: Data from the Cardiovascular Risk in Young Finns Study (YFS) were collected from 1853 participants aged 30 - 45 years. Objective: The study objective was to determine the convergent validity of a PA questionnaire against objectively measured PA in adults obtained with the use of a pedometer. An objective measurement, such as the use of a pedometer, can be used to validate the findings of a PA questionnaire in a large population. Tammelin 4ġ Faculty of Sport and Health Sciences, University of Jyvaskyla, Jyvaskyla, Finland.Ģ Research Centre of Applied and Preventive Cardiovascular Medicine and Departments of Clinical Physiology and Internal Medicine, University of Turku and Turku University Central Hospital, Turku, Finland.ģ Menzies Research Institute Tasmania, University of Tasmania, Hobart, Australia.Ĥ LIKES Research Centre for Physical Activity and Health, Jyvaskyla, Finland.ĥ Turku PET Centre, Turku University Hospital, University of Turku, Turku, Finland.Ħ Department of Clinical Physiology and Nuclear Medicine, University of Turku, Turku, Finland.ħ Division of Experimental Cardiology, Thoraxcenter, Erasmus MC, University Medical Center Rotterdam, Rotterdam, the Netherlands.Ĩ Department of Pediatrics, University of Tampere and Tampere University Hospital, Tampere, Finland.īackground: Traditionally, a self-reported questionnaire has been a cost-effective method of gathering information about physical activity (PA). Magnussen 2,3, Xiaolin Yang 4, Risto Telama 1, Ilkka Heinonen 5,6,7, Nina Hutri-Kähönen 8, Kasper Salin 1, Jorma Viikari 2, Olli T.
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