RT info:eu-repo/semantics/article T1 Test-retest and inter-rater reliability of a rotary axis encoder-flywheel system for the assessment of hip rotation exercises A1 Lahuerta Martin, Silvia A1 Esteban Lozano, Elena A1 Jiménez del Barrio, Sandra A1 Robles Pérez, Román A1 Mingo Gómez, María Teresa A1 Ceballos Laita, Luis A1 Hernando Garijo, Ignacio K1 Reliability K1 Fiabilidad K1 Exercise - Physiological aspects K1 Ejercicio - Aspectos fisiológicos K1 Physical activity K1 Cadera K1 Test-retest K1 Medical technology - Evaluation K1 Technology assessment K1 Tecnología - Evaluación K1 2411.06 Fisiología del Ejercicio K1 3314 Tecnología Médica AB Background: Flywheel devices have found extensive use as a resistance training method. Performance monitoring during functional exercises can be achieved through a coupled rotary axis encoder. However, the reliability of a rotary axis encoder-flywheel system remains underexplored for isolated movements. This study aims to assess test-retest and inter-rater reliability of a rotary axis encoder-flywheel system for assessing hip rotation movements. Methods: Twenty-nine physically active participants were included. The Conic Power Move® flywheel was used to perform hip internal and external rotation exercises. Mean and peak values for velocity, force, and power were collected using a Chronojump rotary axis encoder and the Chronojump software v.2.2.1. The intraclass correlation coefficient (ICC) and the coefficient of variation (CV) were calculated to assess relative and absolute reliability, respectively. Standard error of measurement and minimum detectable changes were also calculated. Results: Good to excellent ICCs (0.85–0.98) were achieved for test-retest and inter-rater reliability in all outcomes for both hip internal and external rotation exercises. There was acceptable test-retest absolute reliability (CV < 10%) for mean and peak velocity, and mean force of hip internal and external rotation (CV = 4.7–7%). Inter-rater absolute reliability was acceptable for mean and peak velocity, mean power, and mean force (CV = 4.7–9.8%). Conclusion: The rotational encoder-flywheel system demonstrated good to excellent relative reliability for assessing hip rotation exercises. Peak force and power values exhibit absolute reliability >10%, so the use of mean and peak velocity, mean force, and mean power seems more adequate for measurements with the rotary axis encoder-flywheel system. PB MDPI SN 2076-3417 YR 2023 FD 2023 LK https://uvadoc.uva.es/handle/10324/67268 UL https://uvadoc.uva.es/handle/10324/67268 LA eng NO Applied Sciences, 2024, Vol. 14, Nº. 1, 372 NO Producción Científica DS UVaDOC RD 28-jun-2024