Paving the way for a better understanding of the pathophysiology of gait impairment in myotonic dystrophy: a pilot study focusing on muscle networks.
Antonino Naro, Simona Portaro, Demetrio Milardi and 5 others
PMID 31533780WHAT IT FOUND
People with myotonic dystrophy type 1 walked slower and showed different muscle coordination patterns than controls, and weakness did not track with these changes.
Key findings
01Patients walked more slowly than controls (0.6 ± 0.04 vs. 1.2 ± 0.01 m/s) and scored lower on an overall gait quality index (81 ± 5 vs. 98 ± 2%).
02Quiet standing was less stable in patients: center-of-pressure path length was 556 ± 40 mm versus 370 ± 57 mm in controls.
03Patients required five to six muscle activation patterns to reconstruct walking, versus two in controls, and weakness was not related to these network or activation-pattern findings.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study was a small pilot, so it cannot show how common these findings are or how they vary across disease severity. Patients differed in age, disease duration, comorbidities, and CTG expansion range, and the authors did not stratify network results by age or duration. The work was observational and did not test any rehabilitation intervention, so it cannot show that coordination training improves gait. The authors also note that spinal networks may contribute to coherence and activation patterns and were not separated.
The easy way to misread this
Do not conclude that a muscle-network or coordination-based rehabilitation programme improves gait. This was a small observational pilot, not a treatment trial, and the network findings were associations rather than proof of cause.