Comparison of Ground Reaction Force, Changes of Center of Mass to Center of Pressure, Time to Stabilization and Shear Force in pair legs landing between Elite Women & Men Alpine Skiers
Paper ID : 1358-12THCONG
1GRADUATED FROM MASTER OF SCIENCE FROM ISLAMIC AZAD UNIVERSITY OF CENTRAL TEHRAN BRANCH.FACULTY OF PHYSICAL EDUCATION AND SPORTS SCIENCE DEPARTMENT OF SPORTS BIOMECHANICS
2Professor,Kharazmi University, Tehran, Iran
Introduction: In all sports, optimal performance and achievement is serious. Physical skill and psychological abilities are among the determinant factors in reaching the athlete's peak attitude. Due to roles of kinetic analysis on sport skill performance the main purpose of the present study was to compare ground reaction force, changes of center of mass to center of pressure, time to stabilization in pair legs landing between elite women & men Alpine skiers. Jumping, falling, shearing stress and maintaining balance are the main skills of Alpine Ski. Materials and methods: In this semi- experimental study, 16 alpine skier consisting of 8 women and 8 men, women (weight 55.78± 5.91 kg, height 161± 5.08 cm, age 34± 4), men (weight 81.85± 5.8 kg, height 177± 3.97 cm, age 36± 4) participated. After completing pair legs landing test from a height of 40 cm on the force plate, the biomechanical variables listed were compared by one-way covariance test at a significant level of p≤0.05. Results: there is no significant difference between the GRF, TTS and only the anterior-posterior components of the COM to COP changes have a significant difference between two groups. 3% were more in women than men. Conclusion: It seems that women undergo more oscillations during landing to achieve stability which increases the risk of knee injuries, especially ACL. Further studies on landing patterns are needed to find the cause of oscillations also pay particular attention to exercises for women on improvement Neuromuscular functions, deep receptors, plyometric neuromuscular exercises and central muscle trunk and the ratio of the strength of the hamstring muscles to the quadriceps is recommended.
Keywords: alpine skiers; pairlegs landing; Ground reaction force; mass center pressure changes; time to stabilization; shear force