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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]

This article presents some issues for consideration before scaling from a pilot study to a larger investigation in longitudinal observational studies of traumatic brain injury (TBI) rehabilitation. We present a case to discuss protocol improvements in longitudinal TBI-rehabilitation studies. The case was a pilot study conducted at two university hospitals in Denmark investigating 1-year outcomes related to sleep disturbance and agitation during neurointensive care. We included patients with moderate and severe TBI determined by the Glasgow Coma Scale, sleep disturbance was assessed using actigraphy, and agitation was assessed using the Agitated Behavior Scale. Patients (n = 29) were more severely ill and had poorer six-month outcomes in Eastern vs. Western Denmark. Recovery was similar at one-year follow-up. Protocol improvements were needed in relation to inclusion criteria, intervention delivery, patient assessment, and follow-up outcomes. In TBI-rehabilitation studies, we suggest adding the severity of disease score to the initial GCS score and a delirium detection score to the ABS score. Actigraphy should not be used during deep sedation. Established procedures should be in place along all stages of the study protocol, including preparation and periodic assessment of study nurses to optimize data quality. [ABSTRACT FROM AUTHOR]