Effects of task dynamics on coordination of the hand muscles and their adaptation to targeted muscle assistance |
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| Affiliation: | 1. Center for Applied Biomechanics and Rehabilitation Research, MedStar National Rehabilitation Hospital, Washington, DC 20010, USA;2. Department of Biomedical Engineering, Catholic University of America, Washington, DC 20064, USA;3. Center for Brain Plasticity and Recovery, Georgetown University, Washington, DC 20057, USA;4. Human Motor Control Section, National Institute of Neurological Disorders and Stroke, Bethesda, MD 20814, USA;1. Qiushi Academy for Advanced Studies, Zhejiang University, Hangzhou 310027, China;2. Key Laboratory of Biomedical Engineering of Ministry of Education, Zhejiang University, Hangzhou 310027, China;3. Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, China;4. Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Zhejiang University, Hangzhou 310027, China;5. Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shengzhen 518055, China;1. The Ohio State University Davis Heart and Lung Research Institute, 473 W. 12th Ave, Columbus, OH 43210, USA;2. OSU Department of Physiology and Cell Biology, 473 W. 12th Ave, Columbus, OH 43210, USA;3. Dalio Institute for Cardiovascular Imaging, Weill-Cornell Medical Center, New York, NY 10021, USA;4. University of Maryland School of Public Health, Department of Epidemiology and Biostatistics, College Park, MD 20742, USA;1. Department of Orthopedic Surgery, Bayreuth Hospital, Bayreuth, Bavaria, Germany;2. Department of Neurology, Bayreuth Hospital, Bayreuth, Bavaria, Germany;3. Sport and Exercise Science Research Centre, School of Applied Sciences, London South Bank University, London, United Kingdom;1. Departamento e Instituto de Psiquiatria, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, SP, Brazil;2. National Institute of Developmental Psychiatry for Children and Adolescents, CNPq, São Paulo, Brazil;3. Interdisciplinary Lab for Clinical Neurosciences (LiNC), Universidade Federal De Sao Paulo (UNIFESP), Sao Paulo, Brazil;4. Center of Mathematics, Computing and Cognition, Universidade Federal Do ABC, Santo Andre, Brazil;5. Department of Psychiatry, Federal University of Rio Grande Do Sul, Porto Alegre, Brazil;6. Medical Physics and Radioprotection Service, Hospital de Clínicas de Porto Alegre, Brazil;7. Department of Psychiatry, Bellvitge University Hospital, Bellvitge Biomedical Research Institute (IDIBELL) and CIBERSAM, Carlos III Health Institute, Barcelona, Spain;8. Department of Psychobiology and Methodology of Health Sciences, Universitat Autònoma de Barcelona, Spain;9. Department of Radiology, School of Medicine, University of Sao Paulo, São Paulo, Brazil;10. Child and Adolescent Psychiatry Unit (UPIA) at the Department of Psychiatry, Federal University of São Paulo (UNIFESP), Sao Paulo, Brazil |
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| Abstract: | Dynamic characteristics of a manual task can affect the control of hand muscles due to the difference in biomechanical/physiological characteristics of the muscles and sensory afferents in the hand. We aimed to examine the effects of task dynamics on the coordination of hand muscles, and on the motor adaptation to external assistance. Twenty-four healthy subjects performed one of the two types of a finger extension task, isometric dorsal fingertip force production (static) or isokinetic finger extension (dynamic). Subjects performed the tasks voluntarily without assistance, or with a biomimetic exotendon providing targeted assistance to their extrinsic muscles. In unassisted conditions, significant between-task differences were found in the coordination of the extrinsic and intrinsic hand muscles, while the extrinsic muscle activities were similar between the tasks. Under assistance, while the muscle coordination remained relatively unaffected during the dynamic task, significant changes in the coordination between the extrinsic and intrinsic muscles were observed during the static task. Intermuscular coherence values generally decreased during the static task under assistance, but increased during the dynamic task (all p-values < 0.01). Additionally, a significant change in the task dynamics was induced by assistance only during static task. Our study showed that task type significantly affect coordination between the extrinsic and intrinsic hand muscles. During the static task, a lack of sensory information from musculotendons and joint receptors (more sensitive to changes in length/force) is postulated to have resulted in a neural decoupling between muscles and a consequent isolated modulation of the intrinsic muscle activity. |
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| Keywords: | Hand Muscle coordination Biomimetic assistance Motor adaptation Extrinsic and intrinsic hand muscles |
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