- Design
- Longitudinal cohort study
- Population
- 294 people with mild-to-moderate Parkinson's disease
- Primary outcome
- Annual change in MoCA and MDS-UPDRS-III
- Effect
- Highest vs lowest activity tertile: MoCA beta 0.47 (0.20-0.74); UPDRS-III beta -0.93 (-1.84 to -0.02)
A longitudinal cohort study followed 294 people with mild-to-moderate Parkinson's disease in Cincinnati for up to seven years for motor scores and five years for cognition, with physical activity measured by structured interview.
The most active third declined more slowly than the least active third on both cognition (MoCA difference 0.47 points per year, 95% CI 0.20 to 0.74) and motor scores (MDS-UPDRS-III difference -0.93 points per year, -1.84 to -0.02). Recent activity mattered even after accounting for activity over the previous decade. Vigorous activity added nothing once total active time was considered, which suggests that duration counts more than intensity.
The motor finding only just reached significance, and people who stay active may differ in ways the analysis cannot fully remove, including milder disease. The message is consistent with trial evidence for exercise in Parkinson's: encourage sustained, regular activity rather than occasional intense exercise.
- Ask about weekly physical activity at each Parkinson's review.
- Encourage regular, sustained activity; total time mattered more than intensity in this cohort.
- Refer for physiotherapy or a structured exercise programme where activity has fallen.
- Address falls risk and orthostatic symptoms so activity can be safe.
Why it matters
It supports framing exercise as part of treatment, not an optional extra.
Don't overread it
Observational and self-reported; it cannot show that activity slows the disease itself.
The statistics, in plain English
The motor confidence interval runs from -1.84 to -0.02, so it only just excludes no effect, and the result is fragile. The cognitive finding is firmer. Both compare the top and bottom thirds of activity, so they describe a gradient, not the effect of a particular exercise prescription.
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