Criterion validity of the sedentary behavior question from the global physical activity questionnaire in older adults
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De La Cámara M.A.
Background: To assess the validity of the single question to determine sedentary behavior (SB) by using the Global Physical Activity Questionnaire (GPAQ) in older adults. Methods: The sample included 163 participants (96 women) aged 65-92 years. Self-reported SB was obtained from the GPAQ. Objectively measured SB was assessed using the Intelligent Device for Energy Expenditure and Activity. Participants wore the Intelligent Device for Energy Expenditure and Activity continuously during 2 consecutive days while following their daily routine. The relative validity was assessed using the Spearman rank correlation coefficient (ρ), and the agreementwas examined usingmean bias and 95%limit of agreement with the IntelligentDevice for Energy Expenditure and Activity as reference. Results: The results showed small correlations (ρ = .291, P < .001) between the SB from the GPAQand the objectivemeasures, and ranged fromρ = .217 to ρ = .491 depending on the potentialmoderator. Similarly, the GPAQ underestimates the SB for approximately 2 hours per day in older adults (limit of agreement = -7.3 to 3.4 h/d). Conclusion: The GPAQ may not be the most suitable questionnaire for measuring SB in this population and should be used with caution because those studies that use this questionnaire in older adults may have an inaccurate measurement of SB levels. © 2020 Human Kinetics, Inc.
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