Comparison of changes in skeletal muscle mass after stroke categorized by the severity of motor dysfunction: a retrospective study.
Rei Odagiri
PMID 39902305WHAT IT FOUND
Seventeen stroke patients showed no significant difference in muscle loss between those with mild and moderate motor dysfunction over eight weeks.
Both groups maintained or slightly gained muscle mass, suggesting severe paralysis alone did not predict faster atrophy in this small sample.
Key findings
01Analysis of variance showed no significant differences in skeletal muscle mass index or lower limb muscle mass between the mild and moderate motor dysfunction groups over time.
02The moderate dysfunction group lost muscle mass (SMI change of -0.31 kg/m2 at 8 weeks), while the mild dysfunction group gained muscle mass (SMI change of 0.14 kg/m2 at 8 weeks), but this difference was not statistically significant.
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 (17 participants), which limits the ability to detect true differences between groups. The rehabilitation program was not standardized; it varied by patient, which may have influenced muscle mass outcomes independently of stroke severity. Participants were excluded if they had severe paralysis (Brunnstrom stage II or lower), so results do not apply to the most severely affected patients. Bioelectrical impedance analysis may be affected by fluid shifts or bowel contents, which were not controlled for in this retrospective design.
Declared interests
The authors have no conflicts of interest to report.
The easy way to misread this
Do not conclude that stroke severity does not affect muscle loss. The study was underpowered with only 17 participants, and the numerical trend showed greater loss in the moderate group, even if it did not reach statistical significance.