The influence of providing feedback on force production and within-participant reproducibility during maximal voluntary exertions for the anterior deltoid,middle deltoid,and infraspinatus |
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| Authors: | Steven L Fischer Alicia L Belbeck Clark R Dickerson |
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| Institution: | 1. Faculty of Kinesiology, Human Performance Laboratory, University of Calgary, Calgary, Alberta, Canada;2. Canadian Centre for Activity and Aging, School of Kinesiology, Faculty of Health Sciences, The University of Western Ontario, Canada;3. Department of Anatomy and Cell Biology, The University of Western Ontario, Canada;1. Department of Kinesiology, University of Waterloo, Waterloo, Canada;2. Department of Clinical and Experimental Sciences, Research Centre for Neuromuscular Function and Adapted Physical Activity “Teresa Camplani”, Università degli Studi di Brescia, Brescia, Italy;3. Department of Systems Design Engineering, University of Waterloo, Waterloo, Canada;1. Physical Activity and Human Performance Research Group, SMI, Department of Health Science and Technology, Aalborg University, Fredrik Bajersvej 7, 9220 Aalborg East, Denmark;2. Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong Special Administrative Region;1. Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada;2. Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada;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 |
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| Abstract: | The normalization of electromyographic signals to a maximum voluntary reference contraction is common practice within the ergonomics research paradigm. However, there is a lack of support for a common protocol for obtaining maximum repeatable exertions. Specifically, there is minimal evidence to support the use of providing force magnitude feedback during the production of voluntary maximum exertions (MVE) in terms of both signal amplitude and repeatability. Therefore, the purpose of this study was to determine (1) if an MVE force magnitude feedback protocol increased both the force exerted and corresponding muscle activity, (2) if force magnitude feedback improved the within-participant reproducibility of the force or activity observed, and (3) if the surface electromyography (sEMG) signal processing method affected the repeatability of determining peak muscle activity.Seventeen participants completed a series of MVEs; first without feedback of the forces they produced, then with feedback of the forces they were producing, and again without feedback to determine if providing force feedback influenced their ability to produce a maximum force. Hand force and sEMG from the anterior deltoid, middle deltoid, and infraspinatus were measured during each exertion. The results showed that the highest forces and muscle activities were achieved when force feedback was provided. Force magnitude feedback resulted in a 7–22% increase in magnitude (for force and activity) and a decrease of 11–46% in the coefficient of variation specifying an improvement in the within-participant reproducibility. Signal processing techniques also affected within-participant reproducibility, however to a much lesser extent. The peak value from a 500-ms moving window average of the linear enveloped or root mean squared sEMG was the most reproducible technique tested. |
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