Causal Mediation Analysis of Factors Influencing Physical Activity and Community Access Among People With Mild-to-Moderate Parkinson Disease.
Serene S Paul, Franchino Porciuncula, James T Cavanaugh and 6 others
PMID 39505247WHAT IT FOUND
Baseline walking self-efficacy predicted increased physical activity, and walking capacity predicted broader community access.
However, non-motor symptoms like back pain and cognitive flexibility did not mediate these relationships, suggesting direct behavioral and physical capacities drive outcomes more than indirect symptom pathways.
Key findings
01Baseline self-efficacy for walking duration was the only self-efficacy measure that predicted three-month moderate intensity physical activity minutes.
02Aerobic walking capacity predicted total community access, but neither walking capacity nor balance predicted near community access.
03Low back pain disability and cognitive flexibility did not significantly mediate the effects of self-efficacy on physical activity or walking capacity on community access.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The sample had relatively low severity of non-motor impairments, which may have masked mediation effects; patients with more severe pain or cognitive issues might show different patterns. All participants received a walking intervention, which may have obscured natural relationships between baseline capacities and community access. Near community access scores did not change over time, limiting the ability to detect predictors of change in this outcome. The study excluded several potential mediators such as exercise preferences and social factors because they were not collected in the parent trial.
The easy way to misread this
Do not conclude that non-motor symptoms like pain and cognitive flexibility are irrelevant to Parkinson’s disease management. The absence of mediation effects here likely reflects the mild severity of these symptoms in the study sample and the universal walking intervention, not that these factors lack clinical importance.