Exploring the effect of repeated-day familiarization on the ability to generate reliable maximum voluntary muscle activation |
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| Authors: | Lydia R Frost Michael E Gerling Jessica L Markic Stephen HM Brown |
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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 Sport, Exercise and Health, University of Basel, Birsstrasse 320B, 4052, Basel, Switzerland;2. Clinic for Trauma, Hand and Reconstructive Surgery, Division of Motor Research, Pathophysiology and Biomechanics, Jena University Hospital, Bachstrasse 18, 07743, Jena, Germany;1. Department of Physiology, Yamanashi Institute of Environmental Sciences, 5597-1 Kenmarubi, Kamiyoshida, Fujiyoshida-shi, Yamanashi 403-0005, Japan;2. Northern Region Lifelong Sports Research Center, Hokusho University, 23 Bunkyodai, Ebetsu-shi, Hokkaido 069-8511, Japan;3. Department of Human Science, Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan;4. School of Psychological Science, Health Sciences University of Hokkaido, 2-5 Ainosato, Kita-ku, Sapporo 022-8072, Japan;5. Department of Clinical Psychology, Faculty of International Studies of Culture, Kyushu Sangyo University, 2-3-1 Matsukadai, Higashi-ku, Fukuoka 813-8503, Japan;6. Biodynamics Laboratory, Center for Health and Sports Science, Kyushu Sangyo University, 2-3-1 Matsukadai, Higashi-ku, Fukuoka 813-8503, Japan;1. MOVE Research Institute Amsterdam, Faculty of Human Movement Sciences, VU University Amsterdam, De Boelelaan 1105, 1081 HV Amsterdam, The Netherlands;2. Department of Anesthesiology, VU University Medical Center Amsterdam, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands;3. EMGO+ Institute for Health and Care Research, VU University Medical Center Amsterdam, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands |
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| Abstract: | Maximum voluntary isometric contractions (MVCs) are commonly used to normalize electromyography (EMG) data and must be reliable even if the individual has no prior experience performing MVCs. This study explored the effect of familiarization over three testing sessions on MVC performance and reliability by comparing muscle activation during standardized maximal and sub-maximal muscle contractions. Participants were recruited into two groups: (1) individuals who regularly engaged in upper body resistance training; (2) individuals with little or no prior experience in upper body resistance training. EMG was collected from two pairs of muscles; biceps brachii and triceps brachii from the arm, and erector spinae and external oblique from the trunk. The trunk muscles were chosen as muscles that are less frequently activated in isolation in day-to-day life. It was found that there were no significant improvements in MVC performance or within-day reliability over the three testing sessions for both resistance trained and non-resistance trained groups. Resistance-trained individuals showed a trend to be more reliable within-day than non-resistance trained participants. Day-to-day MVC reliability, particularly of the erector spinae muscle, was limited in some participants. This suggests that further efforts are needed to improve our capability of reliably eliciting muscle activation MVCs for EMG normalization, especially for muscles that are less frequently activated in isolation. |
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