Strength Assessment of Trunk Rotator Muscles: A Multicenter Reliability Study Rodríguez Perea, Ángela Morenas Aguilar, María Dolores Escobar Molina, Raquel Martínez García, Dario Chirosa Ríos, Ignacio Jesús Jerez Mayorga, Daniel Alejandro Chirosa Ríos, Luis Javier Janicijevic, Danica Core strength Testing Isokinetic Muscle strength dynamometer Reproducibility This study has been partially supported by FEDER/Junta de Andalucia-Consejeria deTransformacion Economica, Industria, Conocimiento y Universidades/Proyecto B-CTS-184-UGR20 and Consejo Superior de Deportes/09/UPB/23 Universidad de Granada Red de Dinamometria Funcional Deportiva. The researcher Angela Rodriguez-Perea, Dario Martinez-Garcia and DanielJerez-Mayorga has a postdoctoral contract through the programme "Recualificacion del profesoradouniversitario. Modalidad Margarita Salas", Universidad de Granada/Ministerio de Universidades yfondos Next Generation de la Union Europea. Background: Trunk rotator strength plays an important role in sports performance and health. A reliable method to assess these muscles with functional electromechanical dynamometer has not been described. Therefore, the objectives of this paper were (I) to explore the reliability of different strength variables collected in isokinetic and isometric conditions during two trunk rotator exercises, and (II) to determine the relationship of isometric and dynamic strength variables collected in the same exercise. Methods: A repeated measures design was performed to evaluate the reliability of the horizontal cable woodchop (HCW) and low cable woodchop (LCW) exercises. Reliability was assessed using t-tests of paired samples for the effect size, the standard error of measurement, the coefficient of variation (CV) and the intraclass correlation coefficient (ICC). The Pearson ' s (r) correlation coefficient was used to explore the association between isometric and isokinetic tests. Results: HCW exercise is more reliable than LCW exercise in assessing trunk rotator muscles. The strength manifestation that should be used is the average strength, and the most reliable evaluation was the HCW at 0.40 m center dot s (-1) concentric (ICC = 0.89; CV = 10.21%) and eccentric (ICC = 0.85; CV = 9.33%) contraction and the dynamic condition that most correlated with the isometric was LWC at 0.50 m center dot s (-1) (r = 0.83; p < 0.01). Conclusion: HCW is a reliable exercise to measure trunk rotator muscles. 2023-10-26T07:27:59Z 2023-10-26T07:27:59Z 2023-08-18 info:eu-repo/semantics/article Rodríguez-Perea, A.; Morenas Aguilar, M.D.; Escobar-Molina, R.; Martínez-García, D.; Chirosa Ríos, I.; Jerez-Mayorga, D.; Chirosa Ríos, L.; Janicijevic, D.; Reyes-Ferrada, W. Strength Assessment of Trunk Rotator Muscles: A Multicenter Reliability Study. Healthcare 2023, 11, 2331. [https://doi.org/10.3390/healthcare11162331] https://hdl.handle.net/10481/85254 10.3390/healthcare11162331 eng http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Atribución 4.0 Internacional MDPI