Influence of eccentric strength of knee extensor muscles on biomechanical factors of a vertical drop jump |
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| Institution: | 1. Department of Physical Education, College of Educational Sciences, Yonsei University, Seoul, South Korea;2. Department of Neurosurgery, Center for Neuroregeneration, Houston Methodist Research Institute, Houston, TX, United States;3. Frontier Research Institute of Convergence Sports Science, Yonsei University, Seoul, South Korea;1. Second Department of Neurology, “Attikon” Hospital, School of Medicine, National and Kapodistrian University of Athens, Chaidari 12462, Athens, Greece;2. First Department of Neurology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece;1. Exercise Physiology and Physical Assessment Laboratory, Serra Gaúcha University Center, Caxias do Sul, RS, Brazil;2. Department of Physical Therapy, Integrated Colleges of Taquara, Taquara, RS, Brazil;3. Exercise Research Laboratory, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil;4. Physique Physiotherapy Center, Porto Alegre, RS, Brazil;1. Pediatric Neurology Department, Timone Children’s Hospital, Marseille, France;2. Gait Laboratory, Pediatric Orthopaedic Surgery Department, Timone Children’s Hospital, Marseille, France;3. Aix-Marseille University, CNRS, ISM UMR 7287, Marseille, France;4. University Children’s Hospital, Basel, Switzerland;5. Gait&Motion Analysis Laboratory, Sol et Salus Hospital, Torre Pedrera di Rimini, Italy;6. AP-HP, Service de Rééducation Neurolocomotrice, Unité de Neurorééducation, Hôpitaux Universitaires Henri Mondor, Créteil F-94010 France;7. UR 7377 BIOTN, Laboratoire Analyse et Restauration du Mouvement, Université Paris Est Créteil (UPEC), France;1. Department of Information Engineering, University of Padua, Padua, Italy;2. Department of Statistical Sciences, University of Padua, Padua, Italy;3. Fresco Parkinson Center, Villa Margherita, S. Stefano, Vicenza, Italy;4. Department of Medicine, University of Padua, Padua, Italy;1. Department of Orthopedic Surgery, Akita Hospital, 2–6-12 Takara, Chiryu City, Aichi 472–0056, Japan;2. Department of Rehabilitation, Akita Hospital, Chiryu, Japan;3. Department of Rehabilitation and Care, Seijoh University, 2–172 Fukinodai, Tokai City, Aichi 476–8588, Japan |
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| Abstract: | During a vertical drop jump (VDJ), the human neuromuscular system absorbs and reuses external loads applied to the lower extremity by coordinating the musculoskeletal system. This study aims to investigate the influence of the eccentric strength of the knee extensor muscles on the biomechanical factors of a VDJ. Participants were divided into two groups based on the eccentric strength of their knee extension muscles: low eccentric (LECC) and high eccentric (HECC) strength groups. The VDJ joint kinematics and kinetics of the lower extremity, the fascicle behavior of the vastus lateralis, and the muscle activation of the knee extensor muscles were simultaneously recorded during maximum-effort VDJ. Compared with the LECC group, the HECC group showed a higher jump, greater knee and ankle joint stiffness, and smaller fascicle length change. These findings suggest that the eccentric strength capacity of the knee extensor muscles accounts for the different biomechanical strategies (bouncing-type for HECC and absorbing-type for LECC) observed between the groups. Consequently, the eccentric strength of the knee extensor muscle may be an essential factor in determining the biomechanical strategy for VDJ and should be considered in the jumping performance enhancement training paradigm. |
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| Keywords: | Vertical drop jump Eccentric muscle strength Neuromuscular control Joint stiffness Fascicle B-mode ultrasound |
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