Most of us have watched someone in the family slow down with age. The hands shake. The steps shorten. Families often ask whether anything beyond medication can hold Parkinson's back.
A new study published October 7, 2026 in Neurology, the medical journal of the American Academy of Neurology, followed 294 people with mild to moderate Parkinson's for up to seven years.
Those active more than 8 hours a week showed slower declines in both thinking and movement than those who moved less than 4 hours.
Eight hours a week works out to just over an hour a day. The activity did not have to be a gym session.
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Brisk walking, doubles tennis, vacuuming and mowing the lawn all counted as moderate activity, meaning everyday chores added to the total. Jogging, singles tennis and heavy carrying counted as vigorous.
The gap between the three activity groups
Researchers at the University of Cincinnati divided participants into three groups by weekly moving time.
The low group logged up to 4 hours a week. The medium group logged 4 to 8 hours. The high group logged more than 8 hours.
Thinking and memory were tracked on a 30-point scale. The low group lost about half a point each year on average. Scores in the medium group barely moved. Scores in the high group were essentially flat over the follow-up.
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Movement symptoms were tracked on a separate 132-point scale, where higher scores mean worse symptoms. The low group worsened slightly each year. The high group actually improved.
The association held after the team accounted for age, sex, education, weight and how severe the disease was at the start.
What the study does and does not show
The study only shows an association, not cause and effect. People with milder disease and sharper memory may simply find it easier to stay active, which could partly explain the gap.
Participants had generally good memory and thinking at the start, so the researchers caution that the results should be read with care. Activity hours were self-reported, which can be inaccurate.
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Ryu added that the differences between activity groups were small but may become more meaningful over time, and that larger studies with longer follow-up are needed.
The study did not test whether starting exercise after diagnosis changes the course. It only looked at people who were already active.
Ryu noted that any benefit may depend on how long patients keep moving over the years. People with Parkinson's who want to add activity should talk to their doctor first about what is safe for them.
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This article is made and published by Ida-Marie Palm Varbæk, who may have used AI in the preparation.