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Measuring the accuracies of motor unit firing times and action potential waveforms derived from surface electromyographic decomposition |
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| Affiliation: | 1. Neuromechanics Laboratory, Department of Health, Sport and Exercise Sciences, University of Kansas, Lawrence, USA;2. Neuromuscular Research Laboratory, Department of Sports Medicine and Nutrition, University of Pittsburg, Pittsburgh, PA, USA;1. Department of Movement, Human and Health Sciences, University of Rome ‘Foro Italico’, Rome, Italy;2. Department of Bioengineering, Imperial College London, SW7 2AZ London, UK;1. Brock University, St. Catharines, ON, Canada;2. Worcester Polytechnic Institute, Worcester, MA, USA;3. Wilfrid Laurier University, Waterloo, ON, Canada;1. Laboratory of Neuromuscular Biomechanics, School of Health and Sport Science, Chukyo University, 101 Tokodachi, Kaizu-cho, Toyota-shi, Aichi 470-0393, Japan;2. Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška cesta 46, 2000 Maribor, Slovenia;3. Toyota Motor Corporation, 1 Toyotacho, Toyota-shi, Aichi 471-8571, Japan |
| Abstract: | This study included spike trigger averaging (STA) procedures to examine the acceptability of the Precision Decomposition (PD) III derived motor unit action potential (MUAP) trains that met the >90% accuracy criteria from the reconstruct-and-test. MUs met the >90% accuracy criteria from the reconstruct-and-test with STA procedures then applied. Y-intercepts and slopes were calculated for the firing rate- and MUAP amplitude-recruitment threshold relationships. Gaussian noise (1% of the SD of the mean interspike interval) was added to the firing times with the changes in MUAPs quantified. A total of 455 MUs were decomposed with 155 MUs removed as a result of the reconstruct-and-test. Five additional MUs were excluded via the STA criteria. The MUAP waveforms deteriorated with the inclusion of Gaussian noise. There were differences in the derived action potentials amplitudes of higher-threshold MUs between the PD III algorithm and the STA procedure. There was excellent agreement among the slopes and y-intercepts between the relationships that included or excluded MUs that did not meet the STA criteria. There was good agreement between the MUAP amplitude-recruitment threshold relationships derived from the PD III and STA procedure. The addition of the STA procedures did not alter the MU-derived relationships. |
| Keywords: | Motor unit Decomposition Spike trigger average Action potential Agreement |
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