Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Views
7430
Download
1180
 
©Journal of Sports Science and Medicine (2019) 18, 295 - 300

Research article
Both Unopposed and Opposed Judo Tasks are Suitable for Analyzing Changes in Lateral Preference
Xian Mayo1,2, , Eliseo Iglesias-Soler2, Xurxo Dopico-Calvo2
Author Information
1 Observatory of Healthy & Active Living of Spain Active Foundation, Centre for Sport Studies, King Juan Carlos University, Madrid, Spain
2 University of A Coruna. Performance and Health Group, A Coruña, Spain

Xian Mayo
✉ Centre for Sport Studies, Raúl González Blanco Stadium, King Juan Carlos University, Fuenlabrada 28942, Madrid, Spain
Email: xian.mayo@urjc.es
Publish Date
Received: 21-11-2018
Accepted: 08-04-2019
Published (online): 01-06-2019
 
 
ABSTRACT

Judo coaches aim to develop left-handed techniques in right-handed judoka due to a potential frequency-dependent strategic advantage during competition. Thus, easily completed tasks are needed to track the progression of the lateral preference index (percentage as right-handed actions). Thirty naïve volunteers performed two tasks, an unopposed repetition-based dynamic task (yakusoku geiko) and an opposed-bouts task (randori), before and after eight-week training protocols differing in the executing side. Training protocols consisted of a control group (without any instruction regarding the practice side), a bilateral group (practicing with both dominant and nondominant sides), and a nondominant group (practicing exclusively on the nondominant side). ANOVA-type tests were used for analyzing the suitability of the unopposed repetition-based dynamic task for detecting changes in the lateral preference index and for analyzing the concordance between tasks. Additionally, concordance was tested with Spearman’s rank correlations and Bland-Altman plots. Lower lateral preference indices (i.e., reductions of executions as right-hander) were observed after training in the nondominant group and in comparison with the control group and bilateral group on the posttest (p < 0.05). ANOVA-test for concordance analysis revealed no differences between tasks (p > 0.05) with significant correlations (p < .05) and low bias during the pretest (ρ = 0.563; bias: 4.29, 95% LoA: -36.32-27.74%) and the posttest (ρ = 0.718, bias: 0.69, 95% LoA: -39.37-40.77%). In conclusion, an unopposed repetition-based dynamic task detected reductions in lateral preference index after an eight-week nondominant training period. These results agreed with those observed with the opposed-bouts task. This indicates the eligibility of yakusoku geiko for coaching delivery due to general suitability of the unopposed repetition-based dynamic task to track the maintenance or progression of left-handedness in judo trainees.

Key words: Laterality, judo, motor learning, skills acquisition


           Key Points
  • An unopposed repetition-based dynamic task (yakusoku geiko-based test) is able to detect reductions in lateral preference index after 8 weeks of nondominant training sessions. In this sense, this test was able to track the progression into left-handedness or the maintenance of right-handedness depending on the analyzed group.
  • This test was as good as a task based on opposed-bouts (randori), indicating an overall concordance in comparison with such an open environment task. Thus, yakusoku geiko is an alternative option as valid and effective as an open environment task to analyze the lateral preference of judo trainees.
  • Yakusoku geiko provides the same information as the randori but in a less time-consuming manner under a closed environment while demands less physical effort from the trainee.
 
 
Home Issues About Authors
Contact Current Editorial board Authors instructions
Email alerts In Press Mission For Reviewers
Archive Scope
Supplements Statistics
Most Read Articles
  Most Cited Articles
 
  
 
JSSM | Copyright 2001-2024 | All rights reserved. | LEGAL NOTICES | Publisher

It is forbidden the total or partial reproduction of this web site and the published materials, the treatment of its database, any kind of transition and for any means, either electronic, mechanic or other methods, without the previous written permission of the JSSM.

This work is licensed under a Creative Commons License Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.