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Abstract Details

Abstract Title

GROUND REACTION FORCES, JOINT MOMENT AND POWER MECHANISM IN TAEKWONDO KICKS

Abstract Theme

Technology in sports

Type Presentation

Poster

Abstract Authors

Afonsa Janaína da Silva - University of Campinas (College of Physical Education) - BR
Presenter Jerusa P.R. Lara - University of Campinas (College of Physical Education) - BR
Heber Teixeira-Pinto - University of Campinas (College of Physical Education) - BR
Ricardo M. L. Barros - University of Campinas (College of Physical Education) - BR

Presentation Details

Poster Exhibition Site (Local): Gold - 2        Date: 1 September        Time: 8am to 7pm        Presenter: Afonsa da Silva

Abstract Resume

Taekwondo (TKD) is an Olympic combat sport characterized by a diverse array of kick techniques, which provides 48 opportunities to dispute medals. Only black belt holders could take part in world and
Olympic championship and for win the competition, it is necessary precisely kick the opponent. The knowledge of movement patterns and mechanical variables could help to improve the competitive
practice and training in order to hold the black belt and win a medal. Thus the purpose of this study was to analyze the kinematics variables of TKD kicks considering the factors: correlation of TKD
belt system and ground reaction forces, effect of kick technique on selected joint moments and power. 23 athletes (age 22.3 ±4.5 years, stature 1.70 ±0.11 m, body mass 65.5 ±15.2 kg, fourteen male and
nine female), all affiliated to the World Taekwondo Federation, volunteered to participate in the study. DVideo kinematic analysis system was used to acquire three-dimensional coordinates of 21
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) fixed in the floor
were used for the acquisition of lower limbs ground reaction forces (GRF). A body representation model compatible with the representation of segments in a chain was used for lower limbs
representation. The Visual 3D software was used to developed the biomechanical model and obtain variables. The following variables were analyzed: a) kicking leg malleolus linear velocity, b) execution
time, c) GRF, d) hip and knee joint moment and e) joint power. Data were analyzed in relation to the following factors: 1) skill level (belt system), 2) kick initial position (static or hopping) and
4) kick techniques (Bandal and Dolyo). Non-parametric statistical tests were used to compare the data according to studied factors. The main results were: TKD belt system showed moderate correlation
with Bandal and Dolyo kick variables - GRF (=0.43 to 0.55) and Dolyo kick maximal linear velocity (=0.43). Moreover the hopping initial position influenced positively the GRF of both legs. For the
analyse of joint moment and power the movement was diveded in three phases: impulse, knee flexion and impact. The kick techniques effect the joint moment and joint moment and power generation
mechanisms. In knee flexion phase Bandal kick showed higher values of maximum adductor moment on kicking leg hip (W=2, p=0.02, SP=0.88) than Dolyo, although Dolyo kick presented with higher values of
knee flexor moment (W=0, p=0.01, SP=0.92). In terms of joint power, the kicks present difference in the supporting (W=0, p=0.01, SP=0.96) and kicking leg (W=0, p=0.01, SP=0.96) knee power in the
sagittal plane, with higher power generation for Bandal chagui in impact phase. The findings from this study provided a new insight into the lower limbs mechanism in TKD kicks execution. This
information must be taken into account when rationalizing strength training, skill level tests or selecting kicks technique for competition.

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