This study aimed to assess the accuracy, precision, and sensitivity of the Ergonauta contact plate in evaluating jump height performance in countermovement (CMJ) and squat jumps (SJ), compared to two previously validated devices (OptoJump and My Jump). Twenty-six young basketball players participated in the study. The participants positioned themselves on the Ergonauta contact plate along with the My Jump app and OptoJump optical measurement system. Three CMJs and SJs were performed, and jump height was analyzed. Intraclass correlation coefficient (ICC) and typical error (TE) were used as relative and absolute reliability indicators, respectively. The Bland-Altman plot was used to examine agreement between metrics (Ergonauta contact plate, My Jump app, and OptoJump) in CMJ and SJ, with significance set at p < 0.05. Results demonstrated excellent relative reliability for both protocols in the Ergonauta contact plate (ICC = 0.94–0.99, TE = 1.07–1.23). Bland-Altman plots showed good agreement for the Ergonauta contact plate (CMJ and SJ) and devices (close to 0). In conclusion, the Ergonauta contact plate proved reliable and valid for assessing jump height performance, particularly in measuring jump height and mean propulsive velocity metrics.
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