Coordinate activity of the quadratus lumborum posterior layer,lumbar multifidus,erector spinae,and gluteus medius during single-leg forward landing |
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| Affiliation: | 1. Faculty of Sport Sciences, Waseda University, Tokyo, Japan;2. Waseda Institute for Sport Sciences, Waseda University, Tokyo, Japan;3. Faculty of Health & Medical Care, Saitama Medical University, Saitama, Japan;1. Institut de recherche Robert-Sauvé en santé et en sécurité du travail (IRSST), 505 Boul. de Maisonneuve W., Montreal, Quebec H3A 3C2, Canada;2. Center for Interdisciplinary Research in Rehabilitation of Greater Montreal (CRIR), Montreal Rehabilitation Institute, Montreal, Quebec, Canada;3. School of Rehabilitation, Faculty of Medicine, Université de Montréal, 2900 Boul. Edouard-Montpetit, Montreal, Quebec H3T 1J4, Canada;1. School of Allied Health Sciences, Griffith University, Nathan Campus, 170 Kessels Road, Brisbane, QLD, 4111, Australia;2. Menzies Health Institute Queensland, Griffith University, Nathan, Australia;3. Brisbane Lions Australian Football Club, 812 Stanley Street, Woolloongabba, QLD, 4012, Australia;4. School of Dentistry, The University of Queensland, Herston, QLD, 4006, Australia;1. Department of Physical Therapy, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran;2. Neuromuscular Rehabilitation Research Center, Semnan University of Medical Sciences, Semnan, Iran;3. Department of Physiotherapy, School of Primary Health Care, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Australia;1. Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, Kagoshima, Japan;2. Graduate School of Health Sciences, Kagoshima University, Kagoshima, Japan |
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| Abstract: | This study aimed to clarify the differences in electromyographic activity between the quadratus lumborum anterior (QL-a) and posterior layers (QL-p), and the relationship among trunk muscles and gluteus medius (GMed) activities during forward landing. Thirteen healthy men performed double-leg and single-leg (ipsilateral or contralateral sides as the electromyography measurement of trunk muscles) forward landings from a 30 cm-height-box. The onset of electromyographic activity in pre-landing and the electromyographic amplitude of the unilateral QL-a, QL-p, abdominal muscles, lumbar multifidus (LMF), erector spinae (LES), and bilateral GMed were recorded. Two-way ANOVA was used to compare the onset of electromyographic activity (3 landing leg conditions × 10 muscles) and electromyographic amplitude among (3 landing leg conditions × 2 phases). The onset of QL-p was significantly earlier in contralateral-leg landing than in the double-leg and ipsilateral-leg landings. The onset of LMF and LES was significantly earlier than that of the abdominal muscles in contralateral-leg landing. QL-p activity and GMed activity on the contralateral leg side in the pre-landing were significantly higher in contralateral-leg landing than in the other leg landings. To prepare for pelvic and trunk movements after ground contact, LMF, LES, QL-p on non-support leg side, and GMed on support leg side showed early or high feedforward activation before ground contact during single-leg forward landing. |
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| Keywords: | Trunk muscles Electromyography Feedforward activation Landing |
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