Untitled

Abstract

Present investigation compared technical/tactical actions, physiological and neuromuscular responses in simulated judo combats with and without opponent changes. Six judokas (22.5±3.0 years-old) participated of three pilot experimental sessions with simulated combats, each one with a different number of opponents (1x1; 1x2; 1x5) in a randomized order. Subjects performed a warm-up and a five-minute combat per session, which was realized in accordance with international rules, with exception for Ippon interruption. Experimental sessions were compared by repeated measures analysis of variance followed by Bonferroni post-hoc, p<0.05. There was a time effect to HR (p=0.001), RPE (p=0.001) and LAC (p=0.001), where the values of intra and post-Randori were higher than pre-Randori. In addition, for LAC and RPE, the values of the post-Randori were higher than the pre and intra-Randori, which emphasizes an increasing linear trend for both variables. A time effect was observed, resulting in a 16 to 11% performance loss in handgrip strength for the non-dominant hand (p=0.027), 36% of loss in time for the isometric test on the bar in the 1x1 situation, and 31% of loss for the 1 x 5 situation, between pre-and post-Randori moments (p=0.002). Upper limbs power, inferred by CMJ, showed a 5% performance loss for 1x1 and 1x2 situation and no loss for 1x5, with no differences between effort moments. Lower limbs power showed a 4%, 15%, and 13% decrease in the 1x1, 1x2, and 1x5 situations. Regarding technical-tactical analysis, the time effect was observed only for the 1x1 group, in which there was a greater volume of attempts in the 4th minute compared to the 1st minute (p=0.009). Kachinuki does not create additional stress for most variables compared to the traditional situation with only one opponent.

Judo combat time, scores, and penalties: Review of competition rules changes between 2010 and 2020

“…Notational analysis is concerned with identifying patterns, often referred to as 'performance indicators', in the judo competitive environment (Brito et al, 2017;Ito et al, 2015). While match demands have been well-described in judo using time-motion (Barreto et al, 2019;Brito et al, 2020;Challlis et al, 2015;Dudeniene et al, 2017;Miarka et al, 2016;Miarka et al, 2016a;Soriano et al, 2019;Sterkowicz-Przybycień et al, 2017), technical-tactical analysis (Calmet et al, 2006;Klys et al, 2020), muscle group specific torque production (Brito et al, 2020;Lech et al, 2015), motor actions (Courel-Ibáñez et al, 2014;Del Vecchio et al, 2018;Calmet et al, 2010;Franchini et al, 2018;Ito et al, 2014;Kajmovic & Radjo, 2014;Miarka et al, 2017;Piras et al, 2014), and biomechanical analysis (Soto et al,2020;Dal Bello et al, 2019;Ito et al, 2019), a practical performance analysis Escobar-Molina et al, 2014) to verify how rules changes between 2010 and 2020 impacted in judo is needed to evaluate contextual information during judo competition (Soto et al, 2020a;Miarka et al, 2015;Tamura et al, 2012).…”

Combat Time in International Male Judo Competitions: A Systematic Review and Meta-Analysis

“…Though specific match demands have been well-described ( Miarka et al, 2012 ; Challis et al, 2015 ; Dudeniene et al, 2017 ; Soriano et al, 2019 ; Brito et al, 2020 ), a practical guide of combat time analysis to verify how independent variables impact in judo is necessary to evaluate contextual evidence during judo tournaments ( Tamura et al, 2012 ; Brito et al, 2017 ; Soto et al, 2020 ; Barreto et al, 2021 ). Previous research with match demands analysis on judo has discovered singular agents in the multifaceted strategic systems of high-level athletes ( Calmet et al, 2006 ; Miarka et al, 2015 ; Del Vecchio et al, 2018 ), who have a predisposition to organize themselves into a vast array of synchronized patterns by altering their actions on the interactions with the opponent ( Ito et al, 2014 ; Piras et al, 2014 ; Miarka et al, 2017 ). In addition, weight category differences in judo have been established, with heavyweights being predominantly susceptible to defeat after being penalized ( Escobar-Molina et al, 2014 ; Sterkowicz-Przybycien et al, 2017 ) and lighter athletes producing more effective attacks when utilizing asymmetrical gripping strategies ( Courel-Ibáñez et al, 2014 ; Kajmovic and Radjo, 2014 ; Kajmovic et al, 2014 ; Kons et al, 2018 ).…”