2019, Volume 15
Coordinative intra-segment indicators of karate performance
Márcio Fagundes Goethel1, Ulysses Fernandes Ervilha 1, Pedro Vieira Sarmet Moreira2, Venicius de Paula Silva 1, Antonio Roberto Bendillati2, Adalgiso Coscrato Cardozo3, Mauro Gonçalves3
1Sensory-Motor Interactions Research Group - GDOR, University of São Paulo, São Paulo, Brazil
2Department of Physical Education, São Paulo State University, São Paulo, Brazil
3Department of Physical Education, São Paulo State University, São Paulo , Brazil
Author for correspondence: Márcio Fagundes Goethel; Sensory-Motor Interactions Research Group - GDOR, University of São Paulo, São Paulo, Brazil; email: firstname.lastname@example.org
Background and Study Aim: Whether from the lower or upper limbs, intersegmental coordination is required at a high level in the blows of various martial arts modalities, with karate being no exception. In karate, precision, high speed, and technique are the hallmarks of attack, counterattack, and defence. The aim of this study was the phase relationship between the proximal and distal joints during the execution of two technique of stroke karate: the punch gyaku tsuki and the kick mae geri.
Material and Methods: The study included 14 male athletes, equally divided into 2 subgroups according to their current competitive level: sub-elite (SEG) and elite (EG). The karate stroke performance measure used was the linear velocity peak of the wrist and foot. In order to analyze the intra-segment coordination, it was applied the nonlinear dynamics approach named continuous relative phase (CRP). From the CRP curve it was obtained the peak as well as the time to reach the CRP peak. It was also compared the index of the coordinative patterns’ variability, which was obtained by calculating the average of the CRP values and standard deviation.
Results: The EG group showed significantly higher values in the linear velocity peak of the wrist and foot when compared to the SEG. With respect to the CRP curve peak and the coordinative patterns variability, the SEG group presented significantly higher values, showing no differences in the time to reach the CRP peak.
Conclusions: The EG group presented a better intra-segment coordinative capacity during the execution of strikes. The stability of coordinative patterns seems to have an intimate relationship with the technical refinement. Thus, this variable can be configured also as a predictor of performance.
Key words: vertical axis, mae geri, nonlinear dynamics, horizontal axis, gyaku tsuki