White matter integrity in physically fit older adults

Area of Science:

• Neuroscience
• Gerontology
• Sports Medicine

Background:

• White matter (WM) integrity naturally declines with aging.
• Physical activity may mitigate age-related WM changes and enhance cognition.
• This study investigates WM integrity in Masters athletes with lifelong aerobic training.

Purpose of the Study:

• To test if lifelong aerobic training is associated with improved brain WM integrity in older adults.
• To examine the effects of sustained physical activity on age-related white matter changes.
• To compare WM integrity between lifelong athletes and sedentary older adults.

Main Methods:

• MRI (FLAIR, DTI) was used to assess white matter hyperintensities (WMH) volume and microstructural integrity (FA, MD).
• Ten Masters athletes (endurance training >15 years) and 10 sedentary older adults were compared.
• Diffusion tensor imaging (DTI) metrics like fractional anisotropy (FA) and mean diffusivity (MD) were analyzed.

Main Results:

• Masters athletes had an 83% reduction in deep WMH volume compared to sedentary controls.
• Higher aerobic fitness (VO2max) correlated inversely with deep WMH volume (r=-0.78, p<0.001).
• Masters athletes exhibited higher FA and lower MD in specific white matter tracts associated with motor control and coordination.

Conclusions:

• Lifelong exercise is associated with reduced white matter hyperintensities in older adults.
• Sustained aerobic training may preserve white matter microstructural integrity.
• These findings highlight the neuroprotective benefits of long-term physical activity for aging brains.