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Kinematics and dynamics analysis of Taekwondo kicks

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Afonsa Janaína da Silva
Total Authors: 1
Document type: Doctoral Thesis
Press: Campinas, SP.
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Educação Física
Defense date:
Examining board members:
Ricardo Machado Leite de Barros; Antonio Carlos Gomes; Luciano Allegretti Mercadante; Sonia Cavalcanti Correa; Karine Jacon Sarro
Advisor: Ricardo Machado Leite de Barros

The general aim of this thesis was to analyze the kinematics and kinetics of Taekwondo kicks considering the factors: reliability of variables to be analyzed, effect of affiliation to different federations and correlation between the belt system and kick biomechanical variables, analysis comparative of selected kick moments and power, and individualized analysis of Taekwondo kick techniques performed by an olympic athlete. The subjects were selected from a screening at academies located near of research center and affiliated to the sport international institutions. In total 37 Taekwondo practitioners were evaluated: 28 men (age 23.6 years ± 6.7, 0.09 ± 1.76m height, mass 75.1 ± 13.6 kg, 19 black belts and 9color belts, 8 affiliated to ITF and 20 to WTF) and 9 women (age 23.2 years ± 7.0, ± 0.32 1.70 m height, mass 19.0 ± 71.9 kg, 4 black belts and 5 color belts, all WTF affiliated) . The DVideo kinematic analysis system was used to acquire three-dimensional coordinate of retro-reflective markers placed on subject lower limbs. The movements were recorded by five cameras (Basler, 100Hz) arranged around the subject. Two force platforms (Kistler, 500Hz - Bioware) fixed in the floor were used for the acquisition of both lower limbs ground reaction forces. A body representation model compatible that represents joints angles with three degrees of freedom was used for lower limbs representation. The Visual 3D software was used to obtain variables. The following variables of both lower limbs were analyzed: a) linear velocity of the kicking leg malleolus, b) execution time, c) target height, d) distance to the target, e) pelvis, hip and knee angles and angular velocities, f) ground reaction forces, g) hip and knee joint moment and h) hip and knee joint power. Data were analyzed in relation to the following factors: 1) competitive style, 2) skill level (graduate), 3) kick initial position (static or hopping) and 4) kick techniques. Non-parametric statistical tests were used to compare the data according to the studied factors. The main results were: competitive style influences the kinematics of the pelvis and the hip kicking leg, the Taekwondo belt system showed moderate correlation with kick variables - ground reaction force, kick linear velocity and execution time, the hopping initial position affects the ground reaction forces of both legs, and the power generated joint mechanism is affected by the kick techniques. In general the results presented in this thesis provide specific information relevant to new research in combat sports biomechanics, as well as, teaching and strength training in Taekwondo (AU)

FAPESP's process: 12/07757-7 - Effects of age, gender, practice and training in kinematics and dynamics of Taekwondo kicks techniques
Grantee:Afonsa Janaína da Silva
Support type: Scholarships in Brazil - Doctorate