The reliability of surface electromyography to assess quadriceps fatigue during multi joint tasks in healthy and painful knees |
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| Authors: | Michael J. Callaghan Christopher J. McCarthy Jacqueline A. Oldham |
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| Affiliation: | 1. University of São Paulo State, School of Science and Technology, Physical Therapy Department, Presidente Prudente, Brazil;2. University of São Paulo, Post-Graduation Program Interunits Bioengineering EESC/FMRP/IQSC-USP, São Carlos, Brazil;3. State University of West Parana, Physical Therapy Department, Cascavel, Parana, Brazil;1. Department of Physical Therapy, Angelo State University, San Angelo, TX, USA;2. Department of Rehabilitaion Sciences and Center for Rehabilitation Research, Texas Tech University Health Sciences Center, Lubbock, TX, USA;3. Kinesiology and Sport Management Division, University of South Dakota, Vermillion, SD, USA;4. Division of Biokinesiology & Physical Therapy, University of Southern California, Los Angeles, CA, USA;1. Physical Therapy Department, School of Science and Technology, University of São Paulo State, Presidente Prudente, Brazil;2. Lower Extremity Gait Studies, La Trobe University, Australia;3. Centre for Sports and Exercise Medicine, Queen Mary University of London, London, UK |
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| Abstract: | This study’s aim was to determine the between days reliability of surface EMG recordings from the superficial quadriceps during a multi joint sub-maximal fatiguing protocol. Three subject groups (healthy n = 29; patellofemoral pain syndrome n = 74; knee osteoarthritis n = 55) performed the task at 60 maximum voluntary isometric contraction on three separate days. Spectral and amplitude EMG parameters were recorded from vastus medialis oblique, vastus lateralis and rectus femoris and were analysed for between days reliability using intraclass correlation coefficient (ICC(2,1)), the standard errors of measure and smallest detectable differences. For frequency results, initial and final frequency values had ‘good’ or ‘excellent’ reliability in all groups for all muscles. ICCs for median frequency slopes for vastus medialis oblique, vastus lateralis, and rectus femoris respectively, in the osteoarthritis group were 0.04, 0.55, and 0.72; in the patellofemoral pain group were 0.41, 0.17, and 0.33; in the healthy group were 0.68, 0.64, and 0.31. The standard errors of measurement and smallest detectable differences for all groups and for all muscles were unacceptably high. For amplitude results, ICC root mean squared initial and final values were ‘good’ to ‘excellent’ for all groups and all muscles, albeit with high measurement error. The ICCs for root mean squared slopes in all tests were ‘poor’ with extremely high measurement error. The poor between days reliability and high measurement error suggests that surface EMG should not be adopted to assess fatigue during multi joint sub-maximal isometric quadriceps testing. |
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