Introduction: Judo requires highly technical and tactical skills with physiological response optimization to succeed. Aim of the study: The present study aims to investigate an association between a rating of perceived exertion (RPE), a heart rate (HR), and a blood lactate concentration [La-] along with a grip strength (GS) deterioration in successive judo simulations (randori). Material and methods: Ten male judokas performed six successive fights (randori), of 5-minute each, with 5-minute rests. The HR, [La-], GS, and grip activation time (GAT) were recorded with a standard procedure at various time points (resting - T0 and after each bout T1-T6). Results: The HR and [La-] showed significant (p < 0.001) differences when compared among T1-T6, including T0, but a variation in the HR (?HR) and a variation in the lactate concentration (?[La-]) reported no significant difference after a post-simulation data comparison. The GS (for both dominant and non-dominant hand) reported significant differences among post-simulation GS measurements, including T0. The GAT was negatively and significantly (p < 0.01) correlated with GS-right (r = -0.397) and GS-left (r = -0.440). Similarly, the RPE was positively correlated with the ?HR, ?[La-], HR, and [La-]. Whereas the GS (for both hands) was negatively (p < 0.05) correlated with the ?[La-] and [La-]. Finally, the ?HR was positively (p < 0.01) correlated with the ?[La-] and [La-]. Conclusions: Judo simulations involve high-intensity exercises, leading to a maximum average frequency RPE of 7-9 with an HR of 192-193 beats·min-1 (90-95% HRmax) and 9.79-15.41 mmol·L-1 of peak [La-]. The RPE was positively (significantly) correlated with the ?HR, ?[La-], HR, and [La-]. Whereas the GAT was negatively (significantly) correlated with the GS-right and GS-left.
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