A new study published in Neurology offers some of the strongest long-term evidence yet that physical activity can slow both cognitive and motor decline in people with Parkinson's disease (PD). Researchers from the University of Cincinnati tracked 294 patients with mild-to-moderate PD over up to 7 years and found that those who exercised more — particularly more than 4 hours per week — fared significantly better on both motor and cognitive assessments.

Importantly, the study found that total activity duration was the key driver of benefit, not intensity. Vigorous exercise alone didn't show additional advantages beyond what total activity time already explained — a nuance that could reshape how clinicians counsel patients about exercise habits.

By the Numbers:

• Least active patients (< 4 hrs/week): MoCA cognitive scores declined 0.478 points over 5 years; motor scores worsened by 0.143 points/year
• Most active patients (> 8 hrs/week): MoCA declined just 0.007 points; motor scores actually improved by 0.783 points/year
• Each additional hour of weekly activity was linked to 0.035 fewer points of annual cognitive decline and 0.082 fewer points of annual motor worsening

Why it matters: No drug has yet been proven to modify PD's course, making lifestyle interventions like exercise especially valuable. These findings suggest physical activity could be a meaningful, accessible tool for slowing disease progression — and the ongoing SPARX3 trial may soon provide the randomized evidence needed to confirm it.