Aerobic exercise for Alzheimer's disease: A randomized controlled pilot trial

Area of Science:

• Neurology
• Gerontology
• Exercise Science

Background:

• Alzheimer's disease (AD) poses a growing challenge, increasing interest in non-pharmacological interventions like physical exercise.
• Early intervention is crucial for managing AD progression and maintaining cognitive and functional abilities.

Purpose of the Study:

• To evaluate the impact of a 26-week supervised aerobic exercise program on memory, executive function, functional ability, and depression in individuals with early Alzheimer's disease (AD).

Main Methods:

• A 26-week randomized controlled trial involving 76 participants with early AD, comparing aerobic exercise (150 min/week) against a stretching and toning control group.
• Assessments included neuropsychological tests, functional ability surveys (Disability Assessment for Dementia), and depressive symptom scales (Cornell Scale for Depression in Dementia) at baseline, 13, and 26 weeks.
• Cardiorespiratory fitness and brain MRI were conducted at baseline and 26 weeks.

Main Results:

• Aerobic exercise demonstrated a modest but significant improvement in functional ability compared to the control group (p=0.02).
• No significant effects were observed on primary outcomes for memory, executive function, or depressive symptoms.
• Secondary analysis revealed a positive correlation between improved cardiorespiratory fitness and enhanced memory performance and hippocampal volume.

Conclusions:

• Supervised aerobic exercise offers benefits for functional ability in early Alzheimer's disease (AD).
• Improvements in cardiorespiratory fitness appear to be a key mechanism driving cognitive and brain structural benefits, including memory enhancement and reduced hippocampal atrophy.