Electromyographic mapping of the erector spinae muscle with varying load and during sustained contraction |
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| Authors: | K Tucker D Falla T Graven-Nielsen D Farina |
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| Institution: | 1. Human Neuroscience Unit, Division of Physiotherapy, School of Health and Rehabilitation Sciences, University of Queensland, Australia;2. Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Bajers Vej 7D-3, DK-9220 Aalborg, Denmark;1. Department of Rehabilitation Science, Graduate School, INJE University, Gimhae, South Korea;2. Department of Rehabilitation Medicine, PUSAN National University Hospital, Pusan, South Korea;3. Department of Physical Therapy, College of Biomedical Science and Engineering, INJE University, Gimhae, South Korea;1. Center for Health Science Research, Laboratory of Functional Evaluation and Human Motor Performance (LAFUP), Universidade Norte do Paraná (UNOPAR), 675 Paris Av, Londrina, PR, Brazil;2. Doctoral and Masters Program in Rehabilitation Sciences UEL/UNOPAR, 675 Paris Av, Londrina, PR, Brazil;3. Florida International University (FIU), Physical Therapy & Neuroscience Departments, Wertheims’ Colleges of Nursing and Health Sciences & Medicine, 11200 SW 8th St., AHC3-430, Miami, FL, USA;4. Universidade Estadual de Londrina (UEL), Rod. Celso Garcia Cid, 445 Km 380, Campus Universitário Londrina, PR, Brazil;1. Department of Rehabilitation and Prevention Engineering, Institute of Applied Medical Engineering, RWTH Aachen University, Aachen, Germany;2. Center for Spine and Scoliosis Therapy, Schön Clinic Fürth Nuremberg, Fürth, Germany;3. Department of Clinical Research and Studies, Össur Deutschland GmbH, Frechen, Germany;1. Bu Ali Sina University, Hamedan, Islamic Republic of Iran;2. Montreal University, Montreal, PQ, Canada;3. Medical University of Hamedan, Islamic Republic of Iran |
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| Abstract: | The purpose of the study was to explore changes in the spatial distribution of erector spinae electromyography amplitude during static, sustained contractions and during contractions of increasing load. Surface electromyographic (EMG) signals were detected from nine healthy subjects using a grid of 13 × 5 electrodes placed unilaterally over the lumbar erector spinae musculature. Subjects stood in a 20° forward flexed position and performed: (1) six 20-s long contractions with loads ranging from 2.5 kg to 12.5 kg (2.5 kg increments) and (2) a 6 min sustained contraction with 7.5 kg load. Root mean square (RMS) and mean power spectral frequency (MNF) were computed from the recorded EMG signals. EMG RMS increased (P < 0.0001) and MNF remained constant during contractions of increased load. During the sustained contraction, MNF decreased (P < 0.0001) and RMS did not change over time. The centroid (center of activity) of the RMS map shifted caudally (P < 0.0001) with time during the sustained contraction but did not change with varying load. These results suggest a change in the distribution of erector spinae muscle activity with fatigue and a uniform distribution of muscle activation across loads. |
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