• Mark A Tully, Ilona McMullan, Nicole E Blackburn, Jason J Wilson, Brendan Bunting, Lee Smith, Frank Kee, Manuela Deidda, Maria Giné-Garriga, Laura Coll-Planas, Dhayana Dallmeier, Michael Denkinger, Dietrich Rothenbacher, and Paolo Caserotti.
• School of Health Sciences, Institute of Mental Health Sciences, Ulster University, Newtownabbey, UK.
• Scand J Med Sci Sports. 2020 Oct 1; 30 (10): 1957-1965.

IntroductionRegular moderate-to-vigorous physical activity (MVPA) is associated with improved mental health, but the evidence for the effect of reducing sedentary behavior (SB) or increasing light PA (LPA) in older adults is lacking. Using isotemporal substitution (IS) models, the aim of this paper was to investigate the effect of substituting SB with LPA or MVPA on associations with mental health in older adults.MethodsData from 1360 older adults (mean age 75.18 years) in four countries were utilized. PA and SB was measured using ActiGraph wGT3X-BT + accelerometers worn for 7 days. Self-rated mental health was measured using the Hospital and Anxiety Depression Scale (HADS). IS models estimated cross-sectional associations when 30 minutes of one behavior was substituted with another. Models were adjusted for age, sex, marital status, and educational attainment.ResultsSubstituting 30 minutes of SB with LPA (β -.37; 95% CI -0.42, -0.32) or MVPA (β -.14; 95% CI -0.21, -0.07) and substituting LPA with MVPA (β -.11; 95% CI -0.18, -0.04) were associated with improvements in anxiety. However, substituting 30 minutes of SB with LPA (β .55; 95% CI 0.49, 0.62) was associated with increased depression.ConclusionReplacing 30 minutes of SB with LPA or MVPA was associated with improved anxiety symptoms in older adults. Greater benefits were observed when shifting SB and LPA to MVPA.© 2020 The Authors. Scandinavian Journal of Medicine & Science In Sports published by John Wiley & Sons Ltd.

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