پیوندهای مفید
آمار
| تعداد نشریات | 8 |
| تعداد شمارهها | 439 |
| تعداد مقالات | 5,662 |
| تعداد مشاهده مقاله | 7,760,435 |
| تعداد دریافت فایل اصل مقاله | 6,371,790 |
Biomechanical Investigation of Empirical Optimal Trajectories Introduced for Snatch Weightlifting | ||
| AUT Journal of Modeling and Simulation | ||
| مقاله 6، دوره 41، شماره 1، تیر 2009، صفحه 41-47 اصل مقاله (543.52 K) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/miscj.2009.224 | ||
| نویسندگان | ||
| Shahram Lenjan Nejadian؛ Mostafa Rostami؛ Ahmad Reza Arshi؛ Abolghasem Naghash | ||
| چکیده | ||
| The optimal barbell trajectory for snatch weightlifting has been achieved empirically by several researchers. They have studied the differences between the elite weightlifters’ movement patterns and suggested three optimal barbell trajectories (type A, B, and C). But they didn’t agree for introducing the best trajectory. One of the reasons is this idea that the selected criterion by researchers might not be appropriate. Therefore we build a biomechanical model based on inverse dynamic approach to evaluate each trajectory while considering a specific mechanical criterion. We calculate the optimal motion of each trajectory that minimizes the actuating torques by using dynamic programming approach. We solve an example problem for a specific weightlifter that lifts a 100 (kg) barbell. According to our criterion, we recommend the pattern type C as the best trajectory. The most important result of this simulation is the cost assigned to each trajectory which gives us the ability to evaluate the trajectories clearly. This method is an appropriate tool for coaches to examine each trajectory for any specific weightlifter and make a good decision for selecting the best trajectory. | ||
| کلیدواژهها | ||
| Sport Biomechanics؛ Simulation؛ Dynamic programming؛ optimization | ||
| عنوان مقاله [English] | ||
| Biomechanical Investigation of Empirical Optimal Trajectories Introduced for Snatch Weightlifting | ||
| چکیده [English] | ||
| The optimal barbell trajectory for snatch weightlifting has been achieved empirically by several researchers. They have studied the differences between the elite weightlifters’ movement patterns and suggested three optimal barbell trajectories (type A, B, and C). But they didn’t agree for introducing the best trajectory. One of the reasons is this idea that the selected criterion by researchers might not be appropriate. Therefore we build a biomechanical model based on inverse dynamic approach to evaluate each trajectory while considering a specific mechanical criterion. We calculate the optimal motion of each trajectory that minimizes the actuating torques by using dynamic programming approach. We solve an example problem for a specific weightlifter that lifts a 100 (kg) barbell. According to our criterion, we recommend the pattern type C as the best trajectory. The most important result of this simulation is the cost assigned to each trajectory which gives us the ability to evaluate the trajectories clearly. This method is an appropriate tool for coaches to examine each trajectory for any specific weightlifter and make a good decision for selecting the best trajectory. | ||
| کلیدواژهها [English] | ||
| Sport Biomechanics, Simulation, Dynamic programming, optimization | ||
| مراجع | ||
|
[1] W. Baumann, V. Gross, K. Quade, P. Galbirez, and A. Schwirtz, “The snatch technique of world class weightlifters at the 1985 world championship,” International Journal of Sport Biomechanics, vol. 4, pp. 68-89, 1988. [2] R. Byrd, “Barbell trajectories: three case study,” Strength and Health, vol. 3, pp. 40-42, 2001. [3] J. Garhammer, “Biomechanical profiles of Olympic weightlifters,” International Journal of Sport Biomechanics, vol. 1, pp. 122-130, 1985. [4] J. Garhammer, “Weightlifting performance and techniques of men and women,” in Proc. 1998 First International Conference on Weightlifting and Strength Training, pp. 89-94. [5] J. Garhammer, “Barbell trajectory, velocity, and power changes: six attempts and four world records,” Weightlifting USA, vol. 19 (3), pp. 27-30, 2001. [6] V. Gourgoulis, N. Aggelousis, G. Mavromatis, and A. Garas, “Three-dimensional kinematic analysis of the snatch of elite Greek weightlifters,” Journal of Sports Sciences, vol. 18 (8), pp. 643-652, 2000. [7] G. Hiskia, “Biomechanical analysis of world and Olympic champion weightlifters performance,” in Proc. 1997 IWF Weightlifting Symposium, pp. 137-158. [8] T. Isaka, J. Okada, and K. Funato, “Kinematics analysis of the barbell during the snatch movement of elite Asian weightlifters,” Journal of Applied Biomechanics, vol. 12, pp. 508-516, 1996. [9] B. Schilling, M. Stone, H. S. O'Brayant, A. C. Fry, R. H. Cogllanese, and K. C. Pierce, “Snatch technique of college national level weightlifters,” Journal of Strength and Conditioning Research, vol. 16 (2), pp. 551-555, 2002. [10] A. N. Vorobyev, A Textbook on Weightlifting, Budapest: International Weightlifting Federation, 1978. [11] C. Chang, D. R. Brown, D. S. Bloswick, and S. M. Hsiang, “Biomechanical simulation of manual lifting using spacetime optimization,” Journal of Biomechanics, vol. 34, pp. 527-532, 2001. [12] C. J. Lin, M. M. Ayoub, and T. M. Bernard, “Computer motion simulation for sagittal plane activities,” International Journal of Industrial Ergonomics, vol. 24, pp. 141-155, 1999. [13] W. Park, B. J. Martin, S. Choe, D. B. Chaffin, and M. P. Reed, “Representing and identifying alternative movement technique for goal-directed manual tasks,” Journal of Biomechanics, vol. 38, pp. 519-527, 2005. [14] S. L. Nejadian, M. Rostami, and F. Towhidkhah, “Optimization of barbell trajectory during the snatch lift technique by using optimal control theory,” American Journal of Applied Sciences, vol. 5 (5), pp. 524-531, 2008. [15] M. Rostami, and G. Bessonnet, “Sagittal gait of a biped robot during the single support phase, Part 2: Optimal motion,” Robotica, vol. 19, pp. 241-253, 2001. [16] S. L. Nejadian, and M. Rostami, “Optimization of barbell trajectory during the snatch lift technique by using genetic algorithm,” in Proc. 2007 Fifth IASTED International Conference in Biomechanics, pp. 34-39. [17] D. B. Chaffin, and G. B. Anderson, Occupational Biomechanics, Wiley, 1991. [18] L. L. Menegaldo, A. D. Fleury, and H. I. Weber, “Biomechanical modeling and optimal control of human posture,” Journal of Biomechanics, vol. 36, pp. 1701-1712, 2003. [19] B. P. Derwin, “The snatch: Technical description & periodization program,” National Strength & Conditioning Journal, vol. 12, pp. 80-81, 1990. | ||
|
آمار تعداد مشاهده مقاله: 2,170 تعداد دریافت فایل اصل مقاله: 1,729 |
||