Individuals with Higher Levels of Physical Activity after Stroke Show Comparable Patterns of Myelin to Healthy Older Adults.
Brian Greeley, Cristina Rubino, Ronan Denyer and 4 others
PMID 35533214WHAT IT FOUND
Stroke survivors who were more physically active showed brain myelin patterns comparable to healthy older adults, unlike those with low activity levels.
This suggests physical activity may protect against myelin asymmetry after stroke, independent of motor impairment or arm use differences.
Key findings
01Individuals with stroke in the high physical activity group had myelin asymmetry ratios comparable to older adults, whereas those in the low physical activity group showed significantly greater asymmetry.
02The difference in myelin asymmetry between high and low physical activity stroke groups was not explained by differences in motor impairment, age, lesion volume, or time since stroke.
03Higher myelin asymmetry was positively correlated with greater asymmetry in wrist steps across three brain regions, suggesting a link between arm use patterns and brain structure.
STILL TO COME
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What it does not show
Cross-sectional design prevents determining whether physical activity causes changes in myelin or if myelin status influences activity levels. Small sample size, particularly in the high physical activity stroke group (n=8). Physical activity measured over only 72 hours, which may not capture long-term activity patterns. Excluded participants with registration issues or incomplete data, reducing the initial sample size.
Declared interests
The authors declared no potential conflicts of interest. The study was funded by the Canadian Institutes of Health Research.
The easy way to misread this
Do not conclude that physical activity directly causes improved myelin symmetry or motor recovery. The cross-sectional design shows an association, but does not prove that increasing physical activity will change myelin structure or improve function in individual patients.