Table 1_Association between physical activity and incident dementia among individuals with hypertension.docx

Compared with the lowest quartile, the highest quartile of MPA (HR 0.41, 95% CI 0.31–0.54), VPA (HR 0.34, 95% CI 0.25–0.46), MVPA (HR 0.43, 95% CI 0.32–0.57), and TPA (HR 0.63, 95% CI 0.49–0.82) had lower risks of incident dementia. In the questionnaire-based cohort, 5,647 (2.5%) cases occurred over a median of 13.7 years. Higher PA levels, particularly leisure-time and housework-related PA, were consistently tied to a lower risk estimate.

MPA showed a more pronounced risk reduction for early-onset than late-onset dementia (ratio of HR 0.69, 95% CI 0.50–0.96).</p>Conclusion<p>Higher levels of MPA, MVPA, VPA, and TPA are associated with a lower risk profile for dementia among individuals with hypertension, with variations observed across activity domains and age of onset. However, the reliance on hospital and death records for dementia ascertainment may underestimate the true burden by missing milder cases.

These findings demonstrate associations rather than causal effects and require confirmation in intervention studies.</p>