Dynamical network-based evaluation for neuromuscular dysfunction in stroke-induced hemiplegia during standing.
Jinping Li, Na Zhang, Ying Xu and 5 others
PMID 39449006WHAT IT FOUND
Stroke patients show rigid, overly coupled muscle coordination during standing, especially without vision.
This stiffness correlates with poor balance. The unaffected side compensates heavily, while the affected side's muscles contribute less, suggesting targeted training for the weak side may be needed.
Key findings
01Post-stroke patients exhibited significantly higher clustering and lower path length in muscle networks than healthy controls, but only when standing with eyes closed.
02Muscle network rigidity was significantly correlated with larger center of pressure area, indicating that tighter intermuscular coupling is associated with poorer standing balance.
03On the affected side, gluteus maximus, gluteus medius, tibialis anterior, and gastrocnemius had significantly lower contribution rankings than on the unaffected side, indicating reduced role in postural control.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
Small sample size (10 patients, 10 controls). All participants were male, limiting generalizability to women. Cognitive status was not controlled, though all completed tasks. Matched sides in controls were assigned based on patient anatomy, not limb dominance. Study design is cross-sectional; it cannot show how these patterns change with recovery or treatment.
Declared interests
Funded by Science and Technology Program of Suzhou, National Natural Science Foundation of China, Key Research & Development Programs of Guangdong Province, National Key Research and Development Program of China, Key Technologies Research and Development Program, and Key Disciplines Construction Project of Suzhou. No commercial conflicts declared.
The easy way to misread this
Do not interpret the higher muscle coupling as a sign of better control. The study shows this rigidity is associated with worse balance (larger center of pressure area). It is a maladaptive pattern, not a strength.