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Introduction: Regular 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. Methods: Data 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. Results: Substituting 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. Conclusion: Replacing 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. [ABSTRACT FROM AUTHOR]

With a growing ageing population and the advent of interactive TV (iTV), understanding how older people use iTV services is a timely and important task. Working towards this end, this paper reports on in situ conversations of, and observations with, almost 400 older people, with different levels of educational attainment and experience with ICTs, while talking about and using online video portals and similar interactive systems in Spain, Brazil and Denmark. The results show more similarities than differences in their reasons for adopting online video portals and patterns of use. All our participants used these portals for keeping or remaining in touch with people they trusted. The results also show that privacy online was a common concern to all the participants. Differences in the acceptance of e-government services and the type of content that drove most of their interactions were also found. Implications for designing more accessible and meaningful iTV services are discussed. [ABSTRACT FROM AUTHOR]