2020, Volume 16
Application of inertial sensors system for diagnosis of taekwon-do’s forms performance – a case study
Jacek Wąsik1, Dariusz Mosler1, Tomasz Góra1, Dorota Ortenburger1
1FACULTY OF HEALTH SCIENCES, Jan Dlugosz University in Czestochowa, Poland, Częstochowa, Poland
Author for correspondence: Jacek Wąsik; FACULTY OF HEALTH SCIENCES, Jan Dlugosz University in Czestochowa, Poland, Częstochowa, Poland; email: firstname.lastname@example.org
Background and Study Aim: New technology brings new ways to assess performance in the forms in martial arts from biomechanical perspective. The aim of this study is knowledge about the usefulness of kinematic assessment in objective analysis of rhythm (patterned recurrence of movement in time), tempo (speed of motion) and dynamics of taekwondo techniques while performing certain form.
Material and Methods: ITF taekwon-do athlete participated in this study (male; age 30 years; body mass 56 kg; height 160 cm). During an analysis, the participant performed a sequence of techniques called saju-jirugi. For the purpose of this analysis, inertial system were used. Acceleration and angular velocity data from both sensors attached to dorsal area of fist was obtained.
Results: Maximal velocity of striking punch (right), gradually decreases from 11.68 m/s to 8.55 m/s. In the same time, maximal velocities of retracted, opposite hand was higher for every punch (highest value of 12.67 m/s), but without same tendency. There is moderate correlation between maximal velocities of both hands during measured strikes (r = 0.65). Highest correlation is noticed between difference in values of maximal velocities of both hands and value of maximal velocity for retracted (left) hand.
Conclusions: Depending on motion capture devices and techniques, angular and linear velocities could serve equally as determinant of performance quality. Conducted research provides sufficient arguments, that this type of measurement allows to objectively measure performance in a single trial as well as monitoring of its progress.
Key words: technique, simulation, movement analysis, kicks kinematics, intentional goal, coordination, velocity