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dc.contributor.authorHoshizaki, Thomas Blaine
dc.date.accessioned2018-09-18T19:23:13Z
dc.date.available2018-09-18T19:23:13Z
dc.identifier.urihttp://hdl.handle.net/10464/13671
dc.description.abstractThis study evaluated the long-term reliability of motor unit discharge rates (MUDRs) during isometric contractions at 60% maximum voluntary contraction (MVC), obtained by decomposition of the surface electromyographic (sEMG) signal from the flexor carpi radialis (FCR) and tibialis anterior (TA). There were four test sessions: one week between sessions 1 and 2; six weeks between sessions 2, 3, and 4. Participants performed 3 maximal isometric contractions of the wrist flexors and 3-isometric ramp contractions to 60% MVC. A load cell and 5-pin electrode (dEMG System, Delsys, Inc., Boston, MA) were used to monitor force and sEMG, respectively. The MUDRs were obtained using the Precision Decomposition Algorithm III in the dEMG Analysis software, and calculated as the inverse of the smoothed firing intervals. The mean discharge rate was calculated during a one-second window centered at the plateau portion of the 60% MVC ramp contraction. Maximal isometric strength during wrist flexion and dorsiflexion was also monitored. Across the four test sessions, maximal isometric strength of the wrist flexors and dorsiflexors increased 10 and 11.85%, respectively (p’s<0.01). The slight lack of stability in means was compensated for a high degree of consistency of strength values within each subject as assess by the intraclass correlation coefficient (R’s >0.94). The MUDRs for the FCR (5.2%) and TA (7.8%) also exhibited slight fluctuations across the four test sessions (p’s<0.01). The consistency of MUDR values within each subject was still considered good, as the intraclass correlation coefficient for both measures was R=0.79. It was concluded that the overall long-term reliability of MUDRs in both the FCR and TA was good.en_US
dc.language.isoengen_US
dc.publisherBrock Universityen_US
dc.subjectElectromyographyen_US
dc.subjectMotor Uniten_US
dc.subjectReliabilityen_US
dc.subjectNeuromuscularen_US
dc.subjectDecompositionen_US
dc.titleEvaluation of the Long-term Reliability of Motor Uni Discharge Rates obtained by Decomposition of the Surface Electromyographic Signalen_US
dc.typeElectronic Thesis or Dissertationen_US
dc.degree.nameM.Sc. Applied Health Sciencesen_US
dc.degree.levelMastersen_US
dc.contributor.departmentApplied Health Sciences Programen_US
dc.degree.disciplineFaculty of Applied Health Sciencesen_US
refterms.dateFOA2021-08-12T01:30:29Z


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