Whole-Brain Metabolic Abnormalities Are Associated With Mobility in Older Adults With Multiple Sclerosis.
Christina Mueller, Jessica F Baird, Robert W Motl
PMID 35164595WHAT IT FOUND
Older adults with MS had widespread brain metabolic changes linked to slower walking and less endurance.
These abnormalities appeared in regions not traditionally tied to movement, suggesting mobility issues may stem from broader brain changes rather than isolated motor cortex damage.
Key findings
01Myo-inositol (MI) levels were significantly higher and N-acetylaspartate (NAA) levels significantly lower in multiple brain regions in older adults with MS compared to healthy controls.
02Higher MI and lower NAA levels in specific brain regions were significantly correlated with worse walking speed and endurance in the MS group.
03Only one metabolic difference (lower NAA in the right thalamus) survived statistical correction for multiple comparisons.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The sample size was very small (15 MS patients and 22 controls analysed), which reduces statistical power and increases the risk of false positives. Only one result survived correction for multiple comparisons, meaning most reported metabolic differences could be due to chance. The study was cross-sectional and correlational, so it cannot prove that metabolic changes cause mobility impairments. Spinal cord pathology, which is known to affect walking in MS, was not assessed. Cognitive functions, which often co-occur with mobility issues in MS, were not measured, so the link between brain metabolism and walking might be mediated by cognitive decline.
Declared interests
The authors declare no conflict of interest.
The easy way to misread this
Do not interpret the widespread metabolic differences as definitive causes of mobility loss. The study was small, and most findings did not survive statistical correction for multiple testing, so these results are preliminary and require replication in larger samples before changing clinical assumptions.