Reliability and interpretation of single leg stance and maximum voluntary isometric contraction methods of electromyography normalization |
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| Authors: | Marc F Norcross J Troy Blackburn Benjamin M Goerger |
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| Institution: | 1. Neuromuscular Research Laboratory, University of North Carolina at Chapel Hill, USA;2. Sports Medicine Research Laboratory, University of North Carolina at Chapel Hill, USA;1. Department of Human Movement Sciences, Old Dominion University, Student Recreation Center, RM 1007A, Norfolk, VA 23529, USA;2. Department of Human Movement Science, College of Education, Old Dominion University, Norfolk, VA, USA;3. School of Physical Therapy and Athletic Training, College of Heath Sciences, Old Dominion University, Norfolk, VA, USA;1. School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia;2. Worcester Polytechnic Institute, Worcester, MA, USA;3. Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam, the Netherlands;4. Faculty of Sport Sciences, Laboratory “Movement, Interactions, Performance” (EA 4334), University of Nantes, Nantes, France;5. Institut Universitaire de France (IUF), Paris, France;6. School of Electrical and Electronic Engineering, University College Dublin, Dublin, Ireland;7. LISiN, Department of Electronics and Telecommunications, Politecnico di Torino, Torino, Italy;8. Department of Clinical Research and Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark;9. Centre for Health, Exercise and Sports Medicine, Department of Physiotherapy, University of Melbourne, Parkville, Australia;10. Auckland Bioengineering Institute and Department of Engineering Science, University of Auckland, Auckland, New Zealand;11. Trinity College Institute of Neuroscience, School of Psychology, Trinity College Dublin, Dublin, Ireland;12. School of Psychology, Queen’s University Belfast, Belfast, UK;13. School of Human Movement and Nutrition Sciences, The University of Queensland, Australia;14. Department of Rehabilitation and Prevention Engineering, Institute of Applied Medical Engineering, RWTH Aachen University, Aachen, Germany;15. Department of Integrative Physiology, University of Colorado Boulder, CO, USA;p. Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, UK;q. Department of Bioengineering, Imperial College London, London, UK;r. Neuroscience Research Australia, University of New South Wales, Sydney, Australia;s. Faculty of Electrical Engineering and Computer Science, University of Maribor, Koro?ka cesta 46, Maribor, Slovenia;t. Brain and Mind Centre, University of Sydney, Sydney, Australia;u. Department of Neurology, Royal Prince Alfred Hospital, Sydney, Australia;v. US Department of Veterans Affairs, USA;w. Northwestern University, Evanston, IL, USA;x. Shirley Ryan AbilityLab, Chicago, IL, USA;y. Sobell Department of Motor Neuroscience and Movement Disorders, UCL Institute of Neurology, London, UK;z. School of Biomedical Sciences, The University of Queensland, Brisbane, Australia;1. Laboratoire d’Analyse du Mouvement Humain, University of Liège, Liège, Belgium;2. Department of Physical Medicine and Rehabilitation, University of Liège, Liège, Belgium;3. Department of Physical Medicine and Sports Traumatology, University Hospital of Liège, Liège, Belgium;4. Department of Aerospace and Mechanical Engineering, University of Liège, Liège, Belgium;5. Department of Architecture, Geology, Environment and Constructions, University of Liège, Liège, Belgium;1. KU Leuven Musculoskeletal Rehabilitation Research Group, Department of Rehabilitation Sciences, Faculty of Kinesiology and Rehabilitation Sciences, Belgium;2. Group T International University College, Leuven, Belgium |
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| Abstract: | Normalization of electromyographic (EMG) amplitudes is necessary in the study of human motion. However, there is a lack of agreement on the most reliable and appropriate normalization method. This study evaluated the reliability of single leg stance (SLS) and maximal voluntary isometric contraction (MVIC) normalization methods and the relationship between these measures for the gluteus maximus (GMax), gluteus medius (GMed), rectus femoris (RF), vastus lateralis (VL), hip adductor group (ADD), and biceps femoris (BF). Surface EMG was recorded in 20 subjects during three 5 s trials of SLS and MVIC. SLS and MVIC methods both demonstrated good-to-excellent reliability in all muscles (ICCs > 0.80). Intrasubject coefficients of variation were lower for the MVIC method (9–36%) than for the SLS method (20–59%). EMG amplitudes during MVIC and SLS were significantly correlated for all muscles (Pearson r’s = 0.604–0.905, p < 0.005) except GMax (r = 0.250, p = 0.288). Use of SLS normalization for the RF, VL, and BF is not recommended due to a lack of measurement precision. However, this method is justified in the GMax, GMed, and ADD and may provide a better representation of coordinated muscle function during a functional task. |
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