An examination of lower limb asymmetry in ankle isometric force control |
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| Institution: | 1. Department of Physical Therapy, Movement and Rehabilitation Sciences, Bouvé College of Health Sciences, Northeastern University, USA;2. Department of Mechanical and Industrial Engineering, College of Engineering, Northeastern University, USA;3. Department of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA;1. Department of Medical Imaging Center, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China;2. School of Biomedical Engineering, Southern Medical University, Guangzhou, China;3. Department of Medical Imaging Center, The Third Affiliated Hospital, Southern Medical University, Guangzhou, 510630, Guangdong, China;4. Philips Healthcare, Guangzhou, China;1. Division of Ophthalmology, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania;2. Scheie Eye Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania;1. HandiBio EA 4322, Université de Toulon, Toulon, France;2. Department of Neurology, University Hospital Schleswig-Holstein, Christian-Albrechts-University, Kiel, Germany;3. Aix-Marseille Univ, PSYCLE, Aix en Provence, France;1. Research Center for Sectional and Imaging Anatomy, Shandong University School of Medicine, Jinan 250012, Shandong, PR China;2. Shandong Medical Imaging Research Institute, Shandong University, Jinan 250021, Shandong, PR China;3. Xu Zhou Medical College, School of Medical Imaging, Department of Imaging Engineer, Xuzhou 221004, Jiangsu, PR China;4. Shandong Provincial Hospital affiliated to Shandong University, Jinan 250021, Shandong, PR China;5. School of Computer Science and Technology, Tianjin University, Tianjin 300072, PR China |
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| Abstract: | While asymmetries have been observed between the dominant and non-dominant legs, it is unclear whether they have different abilities in isometric force control (IFC). The purpose of this study was to compare ankle IFC between the legs. IFC is important for stabilization rather than object manipulation, and people typically use their non-dominant leg for stabilization tasks. Additionally, studies suggested that a limb can better acquire a motor task when the control mechanism of the task is related to what the limb is specialized for. We hypothesized that the non-dominant leg would better (1) control ankle IFC with speed and accuracy, and (2) acquire an ankle IFC skill through direct learning and transfer of learning. Two participant groups practiced an IFC task using either their dominant or non-dominant ankle. In a virtual environment, subjects moved a cursor to hit 24 targets in a maze by adjusting the direction and magnitude of ankle isometric force with speed (measured by the time required to hit all targets or movement time) and accuracy (number of collisions to a maze wall). Both groups demonstrated similar movement time and accuracy between the dominant and non-dominant limbs before practicing the task. After practice, both groups showed improvement in both variables on both the practiced and non-practiced sides (p < .01), but no between-group difference was detected in the degree of improvement on each side. The ability to control and acquire the IFC skill was similar between the legs, which did not support the brain is lateralized for ankle IFC. |
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| Keywords: | Laterality Functional asymmetry Ankle Isometric force control Inter limb transfer |
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