ABSTRACT
This study aims to investigate the association between the rating of perceived exertion [RPE], heart rate [IIR] and the blood lactate concentration [[La]] in successive judo fight simulations [randori]. Ten athletes participated in the study [age: 25.6 +/- 2.l years; stature: 1.75 +/- 0.07 m; body mass: 75.6 +/- 14.9kg; %BF: 11.5 +/- 7.8%; practice: 14.5 +/- 6.2 years] and completed 4 judo fight simulations [Tl to T4] with duration of 5 min separated by 5 min passive recovery periods. Before each randori, [La| and HR were collected, and after each randori, the same measures and the RPE [CR-10 scale] were collected. Significant correlations were observed between: [1] CR-10 and HR [T2: r =0.70; T3: r =0.64; both, P<0.05]; [2] deltaCR-10 and delta[La] [T1-T2: r = .71, P< 0.05; T2-T3: r =0.92, P<0.01; T3-T4: r=0.73, P<0.05]. Moreover, significant differences were noted in the behavior of the HR between the 2[nd] [T2] and 3[rd] [T3] judo fight simulations [P<0.05]. The use of CR-10 in the evaluation process, as well as in deciding the load of training in judo, should be done with caution
ABSTRACT
The present study aims at investigating the physiological response and technical-tactical parameters in Brazilian jiu-jitsu competition. The study included 35 male Brazilian jiu-jitsu athletes [adult category, body mass: 80.2 +/- 13.0 kg], graded from white to brown belt, during combats fought at regional level. Twenty-two fights were analyzed in terms of technique and time structure. Blood glucose, lactatc and maximal isometric grip strength were determined before and alter the fighrs. The rale of perceived exertion was also assessed after the tight, using the 6-20 Borg rating. The fight were recorded and the following variables were determined: the exertion/pause ratio and subjective intensity of actions, categorized between low and high intensity. The results indicated that during Brazilian jiu-jitsu fights, the gtyeoiytic pathway is only moderately activated [lactate before: 4.4 [4.0 - 4.6] mmol/L, after: 10.1 [8.0 - 11.3] mmol/L; glucose before: 112.4 +/- 22.3 mg/dL, after: 130.5 +/- 31.0 mg/dL]. The exertion during the fight resulted in significant reductions in handgrip strength [right hand grip before: 45.9 +/- 10.3 kgf, after: 40.1 +/- 9.5 kgf; left hand grip before: 44.2 +/- 11.1 kgf, after: 37.0 +/- 10.2 kgf]. The athletes rated the fight as hard: 15 [13 - 15]. Effort/pause ratio was 6:1, while high-intensity actions lasted approximately 4 [s], resulting in a low/high intensity? ratio of 8:1. It is recommended that coaches direct the training loads to simulate the energy demand imposed by the competitive matches, activating moderately the glycolytic pathway. Moreover, the time structure of combats can be used to prescribe both physical and technical-tactical training