Biomechanics of increased spin velocity of flying discs during forehand throws by skilled and unskilled throwers |
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| Authors: | Kei Sasakawa Koji Umegaki Shinji Sakurai |
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| Institution: | 1. Department of Health and Physical Education, Sophia University, Tokyo, Japan;2. Natural Science Studies, Maizuru Natural College of Technology, Maizuru City, Japan;3. School of Health and Sport Sciences, Chukyo University, Toyota City, Japan |
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| Abstract: | We aimed to assess the relationship between throwing distance and kinematic release parameters of the flying disc in unskilled throwers, and to assess the relationship between kinetic variables acting on flying discs and the change in spin velocity during long forehand throws by skilled and unskilled throwers. Ten skilled and eleven unskilled throwers performed throws at maximum effort. Reflective marker positions on the disc and body were recorded with a 3D motion capture system during the throws to derive kinematic variables of a disc and kinetic variables acting on the disc. The analysis interval was from maximum external shoulder rotation to disc release. Significant correlations were observed between the throwing distance and spin velocity in skilled (r = 0.722, P < 0.05) and unskilled throwers (r = 0.794, P < 0.01), between the change in spin velocity and the angular impulse of moments of force, in unskilled throwers (r = 0.703, P < 0.05), and between the change in spin velocity and the angular impulse of torque among skilled throwers (r = 0.680, P < 0.01). Therefore, a strategy for increasing spin velocity in unskilled throwers could be used to generate a larger torque, similar to that observed in skilled throwers. |
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| Keywords: | Flying disc kinetics long throw spin torque |
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