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Self-reported Activity and Accelerometry in 2 Behavior-maintenance Trials

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Objectives: To compare between accelerometry (MVPA-A) and self-reported activity (MVPA-SR) in activity-maintenance (Keep Active Minnesota; KAM) and weight loss-maintenance (Keep It Off; KIO) trials. Methods: Linear regression estimated moderation of study, treatment, or time on MVPA-A and MVPA-SR associations. Results: MVPA-A was similar between studies (KAM 119 minutes, KIO 112 minutes, p = .555), whereas MVPA-SR differed significantly (KAM 350 minutes, KIO 87 minutes, p < .0001). Only study moderated correla-tion between MVPA-A and MVPA-SR. MVPA-SR better predicted MVPA-A in KIO relative to KAM (p = .023). Conclusions: Results suggest that self-presentation bias may influence validity of self-report in intervention studies with activity as a primary outcome. Researchers should select self-report to assess activity dimensions that objective measures capture poorly.
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Keywords: BEHAVIORAL INTERVENTION; BIAS; OBJECTIVE MONITORING

Document Type: Research Article

Affiliations: 1: HealthPartners Institute for Education and Research, Minneapolis, MN, USA [email protected] 2: HealthPartners Institute for Education and Research, Minneapolis, MN, USA

Publication date: 2014-03-01

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  • The American Journal of Health Behavior seeks to improve the quality of life through multidisciplinary health efforts in fostering a better understanding of the multidimensional nature of both individuals and social systems as they relate to health behaviors.

    The Journal aims to provide a comprehensive understanding of the impact of personal attributes, personality characteristics, behavior patterns, social structure, and processes on health maintenance, health restoration, and health improvement; to disseminate knowledge of holistic, multidisciplinary approaches to designing and implementing effective health programs; and to showcase health behavior analysis skills that have been proven to affect health improvement and recovery.

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