Nuñez, Francisco JavierGaliano De La Rocha, CarlosMuñoz López, AlejandroFloria, Pablo2025-01-142025-01-142022Nuñez, F.J., Galiano De La Rocha, C., Muñoz López, A. y Floria, P. (2022). Variability in the application of eccentric force using different rotary inertia devices may influence the treatment of tendinopathy. Journal of Sport Rehabilitatio, 31 (2), 235-238. https://doi.org/10.1123/jsr.2021-0062.1056-67161543-3072https://hdl.handle.net/11441/166615High intra-set variability has been considered as a potential aid in the treatment of tendinopathy by producing forces in variable and unpredictable contexts that allow the athlete to return to sport pain-free. The aim of this study was to compare the intra-set variability in force profiles between different rotational inertia devices (RIDs) during concentric (CON) and eccentric (ECC) phases of movement, and between different moments of inertia. Thirty-nine men performed a half-squat incremental test on two different RIDs: a horizontal cylinder (YY) and a vertical cone-shaped axis (CP). Intra-set variabilities in vertical force and velocity were analyzed using average coefficients of variation. RID squat exercise produced force intra set variability. The ECC phase of the movement showed more intra-set variability in force output than the CON phase. ECC CP showed a higher intra-set variability in force than ECC YY. This study demonstrated that using an RID to provide resistance in squat-training of athletes produced a high intra-set variability in the application of force.application/pdf14 p.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/StrengthMuscle activityKneeBiomechanicsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1123/jsr.2021-0062