Lower extremity control during turns initiated with and without hip external rotation |
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| Institution: | 1. Department of Biomedical Engineering, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA 90089, USA;2. Department of Aerospace and Mechanical Engineering, University of Southern California, OHE 430E, Los Angeles, CA 90089, USA;3. Department of Psychology, University of Southern California, 3620 South McClintock Ave., SGM501, Los Angeles, CA 90089, USA;4. Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, AHF-252, Los Angeles, CA 90089, USA;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. School of Sport, Exercise, and Health Sciences, Loughborough University, Loughborough LE11 3TU, United Kingdom;2. Institute for Sports Research, Nanyang Technological University, Singapore;3. National Institute of Education, Nanyang Technological University, Singapore;1. Dynamics Laboratory, Faculty of Mechanical Engineering, Technion – Israel Institute of Technology, Haifa 3200003, Israel;2. The Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089, USA;1. University of Sydney, Australia;2. Charles Sturt University, Australia;1. The Australian Ballet, 2 Kavanagh St, Southbank, Victoria, 3006, Australia;2. School of Allied Health, La Trobe University, Bundoora, VIC, 3086, Australia;3. La Trobe Sports and Exercise Medicine Research Centre, La Trobe University, Bundoora, VIC, Australia;4. Faculty of Medicine, Nursing and Health Sciences Monash University, Frankston, VIC, Australia;5. MIA East Melbourne Radiology, East Melbourne, Victoria, Australia |
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| Abstract: | The pirouette turn is often initiated in neutral and externally rotated hip positions by dancers. This provides an opportunity to investigate how dancers satisfy the same mechanical objectives at the whole-body level when using different leg kinematics. The purpose of this study was to compare lower extremity control strategies during the turn initiation phase of pirouettes performed with and without hip external rotation. Skilled dancers (n=5) performed pirouette turns with and without hip external rotation. Joint kinetics during turn initiation were determined for both legs using ground reaction forces (GRFs) and segment kinematics. Hip muscle activations were monitored using electromyography. Using probability-based statistical methods, variables were compared across turn conditions as a group and within-dancer. Despite differences in GRFs and impulse generation between turn conditions, at least 90% of each GRF was aligned with the respective leg plane. A majority of the net joint moments at the ankle, knee, and hip acted about an axis perpendicular to the leg plane. However, differences in shank alignment relative to the leg plane affected the distribution of the knee net joint moment when represented with respect to the shank versus the thigh. During the initiation of both turns, most participants used ankle plantar flexor moments, knee extensor moments, flexor and abductor moments at the push leg?s hip, and extensor and abductor moments at the turn leg?s hip. Representation of joint kinetics using multiple reference systems assisted in understanding control priorities. |
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| Keywords: | Joint kinetics Reference systems Turn Dance Biomechanics |
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