Leg and vertical stiffness (a)symmetry between dominant and non-dominant legs in young male runners |
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| Affiliation: | 1. Applied Neuromechanics Research Group, Faculty of Health Sciences, Federal University of Pampa, Uruguaiana, RS, Brazil;2. Graduate Program in Physical Education, Physical Education and Sports Centre, Federal University of Santa Maria, Santa Maria, RS, Brazil;1. Central Campus Recreational Building, 401 Washtenaw Avenue, Ann Arbor, MI 48109, USA;2. Department of Family Medicine, 24 Frank Lloyd Wright Drive, Ann Arbor, MI 48105, USA;1. Michigan Performance Research Laboratory, School of Kinesiology, United States;2. Department of Family Medicine, 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, United States;3. Department of Orthopaedic Surgery, United States;4. Department of Biomedical Engineering, United States;5. Central Campus Recreational Building, 401 Washtenaw Avenue, Ann Arbor, MI, 48109, United States;1. Division of Training and Movement Sciences, Research Focus Cognition Sciences, University of Potsdam, Potsdam, Germany;2. Department of Computer Science, University of Regina, Canada;3. Faculty of Kinesiology and Health Studies, University of Regina, Canada |
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| Abstract: | Biomechanical findings show that running is asymmetric in many kinetic properties. Running stiffness is a vital kinetic property of yet unknown pattern of lateralization. The aim of this study was to examine the degree and variability of lower limb dominance specific asymmetry of running in terms of leg stiffness, vertical stiffness, contact time, flight time, maximal ground reaction force during contact, vertical displacement of the center of mass, and change in leg length. Leg and vertical stiffness was estimated by the sine-wave method in 22 young males during treadmill running at 4.44 m/s. Lower limb dominance was determined by the triple-jump test. Asymmetry was expressed as dominant – non-dominant, and indexed by the absolute asymmetry index. Significant asymmetry was found only in flight time (3.98%) and in maximal ground reaction force (1.75%). The absolute asymmetry index ranged from 1.8% to 6.4%, showed high variation between subjects (0–31.6%), and differentiated among the 7 analyzed variables. Leg and vertical stiffness in treadmill running of moderate pace (4.44 m/s) should be considered symmetric. |
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| Keywords: | Running Leg stiffness Vertical stiffness Dominance Asymmetry |
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