- Design
- Prospective longitudinal cohort
- Population
- 294 people with mild-to-moderate Parkinson disease
- Primary outcome
- Annual change in MoCA and MDS-UPDRS-III
- Effect
- Highest vs lowest activity tertile: MoCA β 0.47 (95% CI 0.20–0.74); UPDRS-III β −0.93 (−1.84 to −0.02)
A Cincinnati cohort followed 294 people with mild-to-moderate Parkinson disease (mean age 66) for up to seven years, measuring physical activity by structured interview and tracking motor scores (MDS-UPDRS part III) and cognition (MoCA).
Those in the most active third declined more slowly than the least active: MoCA fell by about 0.01 points a year versus 0.48, and motor scores improved slightly rather than worsening. The cognitive difference was clear (β 0.47, 95% CI 0.20–0.74); the motor difference was borderline (P = 0.048).
Recent activity mattered independently of activity over the previous decade, and vigorous exercise added nothing once total time was accounted for. That suggests the message to patients is about staying active, regularly and for long enough, rather than about intensity.
The design is observational with self-reported activity, so people who are declining faster may simply be doing less.
- Encourage regular physical activity in Parkinson disease — total time mattered more than intensity
- Ask about current activity at each review; recent activity tracked outcomes
- Refer to physiotherapy or structured exercise when activity is falling
- Be honest that the link is observational and may partly reflect decline reducing activity
Why it matters
It reframes exercise advice from 'push hard' to 'keep going', which more patients can follow.
Don't overread it
This is an observational cohort with self-reported activity; reverse causation is possible.
The statistics, in plain English
A β of 0.47 means the most active group lost about half a MoCA point less per year than the least active. The motor result's confidence interval nearly touches zero, so that effect is less certain.
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