Individuals with Chronic Mild-to-Moderate Traumatic Brain Injury Exhibit Decreased Neuromuscular Complexity During Gait.
Samuel A Acuña, Mitchell E Tyler, Darryl G Thelen
PMID 35321610WHAT IT FOUND
Individuals with chronic traumatic brain injury used fewer muscle coordination patterns while walking than healthy controls.
However, these complexity measures did not correlate with walking speed or clinical balance scores, so they cannot currently be used to gauge a patient's functional impairment.
Key findings
01Individuals with chronic TBI required fewer muscle synergies to describe their gait patterns than controls, indicating reduced neuromuscular complexity.
02Measures of motor control complexity showed no significant correlation with walking speed or standard clinical assessments of balance and gait.
03The specific grouping of muscles into synergies was similar between TBI and control groups, suggesting the difference lies in how these patterns are timed rather than which muscles are activated together.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The TBI group was significantly older than the control group (mean age 53.4 vs 25.3 years), and age differences might account for some of the observed variations in muscle synergy. The measures of complexity did not correlate with clinical outcomes, limiting their current utility for assessing individual patient impairment levels. Only six muscles were analyzed, which may have missed additional synergy weightings that would appear with a broader muscle set. The study was cross-sectional and observational, so it cannot determine if reduced complexity causes gait deficits or is a compensatory strategy.
Declared interests
The study was supported by grants from the National Institutes of Health (NIH) and the U.S. Government. No commercial conflicts of interest are declared in the provided text.
The easy way to misread this
Do not assume that reduced neuromuscular complexity directly predicts a patient's level of functional disability or fall risk. The study found no significant correlation between these complexity measures and walking speed, balance scores, or gait impairment indices.