A broad systematic review and meta-analysis assessing the effects of physical exercise on cognitive impairment across Alzheimer's disease, Parkinson's disease, and mild cognitive impairment, but with no abstract provided and limited disease-specific mechanistic detail.

Offers clinical-level support for exercise as a non-pharmacological, potentially neuroprotective intervention relevant to PD symptoms and cognitive decline, but it provides limited actionable molecular targets or therapeutic-discovery insights.