Regional neuromuscular regulation within human rectus femoris muscle during gait |
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| Affiliation: | 1. Departments of Family and Community Medicine, Obstetrics, Gynecology and Reproductive Sciences, and Epidemiology and Biostatistics, University of California, San Francisco, 995 Potrero Avenue, San Francisco, CA 94110, USA;2. The Office of Population Affairs, U.S. Department of Health and Human Services, Washington, DC, USA;1. Department of Pathology, the University of Alabama at Birmingham, Birmingham, AL 35249, USA;2. Department of Mathematical Sciences, Michigan Technological University, Houghton, MI 49931, USA;1. Department of Diagnostic Pathology, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan;2. Department of Diagnostic Pathology, Steel Memorial Hirohata Hospital, Himeji 671-1122, Japan;3. Department of Diagnostic Pathology, Faculty of Medicine, University of Tsukuba, Tsukuba 305-8575, Japan;4. Ultrasound Imaging Center, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan;5. Department of Surgical Pathology, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan;6. Department of Diagnostic Pathology, Tokai University Hachioji Hospital, Tokyo 192-0032, Japan;7. Department of Pathology, Osaka City General Hospital, Osaka 534-0021, Japan;8. Department of Pathology, Hyogo Cancer Center, Akashi 673-8558, Japan |
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| Abstract: | The spatial distribution pattern of neuromuscular activation within the human rectus femoris (RF) muscle was investigated during gait by multi-channel surface electromyography (surface EMG). Eleven healthy men walked on a treadmill with three gait speeds (4, 5, and 6 km/h) and gradients (0°, 12.5°, and 25°). The spatial distribution of surface EMG was tested by central locus activation (CLA), which is calculated from 2-D multi-channel surface EMG with 46 surface electrodes. For all conditions, CLA was around the middle regions during the swing-to-stance transition and moved in a proximal direction during the stance phase and stance-to-swing transition (p<0.05). CLA during the stance-to-swing transition and early swing phase significantly moved to proximal site with increasing gait speed (p<0.05). During the early stance and swing phases, with increasing grade, CLA significantly moved distally (p<0.05). These results suggest that the RF muscle is regionally activated during a gait cycle and is non-uniformly regulated longitudinally. |
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| Keywords: | Neuromuscular compartment Bi-articular muscles Multi-channel surface electromyography |
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