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Influence of needle electrode depth on DE-STA motor unit number estimation
Colleen T Ives1, Timothy J Doherty
1Department of Clinical Neurological Sciences, Western University, London, Ontario, Canada.
Introduction:
To assess a potential source of technique-associated error, we evaluated the influence of needle electrode depth on decomposition-enhanced spike-triggered averaging (DE-STA) motor unit number estimation (MUNE) and quantitative motor unit analysis in the upper trapezius (UT).
Methods:
The DE-STA MUNE protocol was performed at superficial, intermediate, and deep needle electrode depths in 18 control subjects.
Results:
Mean surface-detected motor unit potential amplitudes were significantly smaller for intermediate versus superficial (P<0.05), deep versus superficial (P<0.001), and deep versus intermediate (P<0.05). MUNE was significantly larger for deep versus superficial (P<0.001), with statistical trends toward larger MUNE values at greater depths for the remaining comparisons. No significant differences were found among needle electrode depths for quantitative motor unit potential parameters.
Conclusions:
These results demonstrate the important influence of needle electrode depth on DE-STA MUNE in the UT. Suggestions are made for improved standardization of the protocol.
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