Comparison of the Maximum Angular Velocity of Lower Limb Joints in Different Methods of Zenkutsu-dachi in Karate

• Main Authors: Ali Amiri Khorasani, Mohammad Taghi Amiri Khorasani, Fariborz Mohammadipour
• Format: Article
• Language: fas
• Published: Islamic Azad University, Hamedan Branch 2020-06-01
• Series: Biyumikānīk-i varzishī
• Subjects: karate; angular velocity; zenkutsu-dachi; hip joint; kinematics
• Online Access: http://biomechanics.iauh.ac.ir/article-1-205-en.html
• ISSN: 2476-4906; 2476-5937

Objective: Proper performance of Dachi in karate as a basic technique has a direct impact on the performance of other techniques. The aim of the present is to compare the maximum angular velocities of the hip, knee and ankle joints under different Zenkutsu-dachi movement patterns in karate athletes. Methods: Participants were 12 male karate athletes height= 175±5.5 cm; weight=75±5.5 kg, age=25±5.5 years, history=8±2.5 years). A three-dimensional motion analyzer with six synchronized infrared cameras at a video recording speed of 200 frames per second was used, and recordings were analyzed in Cortex 2.5.0 software. Zenkutsu-dachi forward movement was performed in six different patterns. The normality of the data distribution was confirmed by Shapiro-Wilk test. To test the study hypotheses, repeated measures ANOVA and Bonferroni post hoc test were used in SPSS V. 25 considering the significant level of P<0.05. Results: There was a significant difference between movement patterns 3 and 4 and between patterns 5 and 6 in the hip joint (P<0.05), while no significant difference in the knee and ankle joints was reported. Each of the Zenkutsu-dachi movement patterns could change the position and range of motion of the hip joint and iliopsoas muscles. Conclusion: By bringing the front leg more forward and bending the back leg slightly, the involved limbs and muscles can be in optimal state and creates greater angular velocity in the hip joint.