STUDY ON THE POSSIBILITY OF HIGHLIGHTING INVARIANTS OF MOTION IN MARTIALARTS KATA EXERCISES

Abstract

Introduction: Martial arts are practiced both as a hobby, for physical
and psychological training, as well as professional sport with
its own rules and competitions. How is performed every move in
karate is highly important. In this article we analyze some movement
in kata exercises. The purpose of this paper is to demonstrate
the existence of stable aspects of movement - motion invariant during
the execution of technical elements of kata. Our application was
made on the kata Heian Nidan. Working methodology consisted in
achieving some tests relating to kinematic characteristic of motion,
in the kata mentioned before. We use an inertial navigation system
that contains 17 sensors - MVNBiomech, produced by Dutch company
XSENS Technologies BV. Female athlete tested holds a black
belt, she practice karate for 8 years and have 22 years old. The
results obtained refers to the oscillation of CGM height, on a total
of 12 repetitions from kata sequence selected. The average values
of height oscillation to CGM = max. 92 cm and min. 72 cm., St. dev.
is Min. = 0.002 and Max.= 0,013 while C.V. = max. 1.7%.
Conclusions drawn from the above results indicate that the average
values are representative and homogeneity is high. Thus we can say
that the invariants (general form of repetitive motion), can be recognized
in the development of technical elements of martial arts
kata exercises (and we can say in other sports). This emphasis of
movement patterns can be useful both referees and coaches
involved in the educational process.