RT Journal Article T1 The load-velocity relationship in the jump squat exercise A1 Loturco, Irineu A1 Mc Guigan, Michael R. A1 Pereira, Lucas A. A1 Pareja Blanco, Fernando K1 Athletic performance K1 Athletes Muscle strength K1 Resistance training K1 Team sports K1 Loaded jumps AB The purpose of this study was to test the load-velocity relationship in the jump squat (JS) exercise using three different velocity parameters (mean velocity [MV], mean propulsive velocity [MPV], and peak velocity [PV]). Twenty-six male rugby union players (24.3 ± 3.9 years; 1.81 ± 0.09 m; 101.3 ± 15.4 kg) performed a progressive loading test in the JS with loads corresponding to 20, 40, 60, and 80% of the half-squat 1RM (equivalent to 24, 46, 70, and 94% of the estimated JS-1RM). MV, MPV, and PV were continuously recorded during all attempts using a linear velocity transducer. Linear regression models were used to determine the relationships between JS loads and MV, MPV, and PV. Bar-velocity outputs demonstrated high levels of consistency and reliability (coefficient of variation ≤ 5% and intraclass correlation coefficient ≥ 0.90). The predictive power of MV, MPV, and PV were ≥ 91%, for all tested variables (P < 0.0001). The equations and bar-velocity values provided in this study can be used by coaches to precisely determine and prescribe JS training loads, from verylight to heavy loading conditions (i.e., ~20–100% JS 1RM). PB Biology of Sport YR 2023 FD 2023 LK https://hdl.handle.net/10433/26340 UL https://hdl.handle.net/10433/26340 LA en NO Loturco, I., McGuigan, M. R., Pereira, L. A., & Pareja-Blanco, F. (2023). The load-velocity relationship in the jump squat exercise. Biology of sport, 40(2), 611–614. https://doi.org/10.5114/biolsport.2023.118019 NO Departamento de Deporte e Informática DS RIO RD May 22, 2026