Different methods have been developed to quantify trunk muscle strength and endurance. However, some important protocol characteristics are still unclear, hindering the selection of the most suitable tests in each specific situation. The aim of this study was to examine the reliability and the relationship between 3 representative tests of the most common type of protocols used to assess trunk muscle strength and endurance. Twenty-seven healthy men performed each test twice spaced 1 month apart.Trunk strength and endurance were evaluated with an isokinetic dynamometer and 2 field tests including Biering-Sørensen test and Flexion-rotation trunk test. All tests showed a good relative consistency (intraclass correlation coefficient [ICC]> 0.75), except for the isokinetic endurance variables which had low-moderate reliability (0.37 < ICC > 0.65). Absolute reliability seemed slightly better in the isokinetic protocol than in the field tests, which showed about 12% of test-retest score increase. No significant correlations were found between test scores. After a familiarisation period for the field tests, the 3 protocols can be used to obtain reliable measures of trunk muscle strength and endurance. Based on the correlation analysis, these measures are not related, which highlights the importance of selecting the most suitable trunk test for each situation.
Gender, but not age, is an important factor when abdominal endurance is compared between adolescents. Finally, the BTC is a reliable test, supporting the findings of this study. However, an extensive familiarization period to reduce the learning effect is necessary.
ARTÍCULO ORIGINAL ResumenAntecedentes: Desde un punto de vista teórico, el desarrollo de la capacidad para estabilizar el tronco podría mejorar el rendimiento del judoca a través del desarrollo del control del equilibrio corporal y la optimización de la transmisión de fuerzas desde los miembros inferiores hacia los miembros superiores. Sin embargo, carecemos de evidencias científicas que permitan establecer una relación clara entre la estabilidad del tronco y el rendimiento en judo. Objetivo: El objetivo principal del estudio fue determinar si la valoración de la estabilidad del tronco y la fuerza y resistencia muscular permitían diferenciar entre judocas de categoría nacional (n = 7) e internacional (n = 6). Asimismo, se analizó la relación entre la estabilidad del tronco y la fuerza y resistencia de la musculatura implicada en el control de la estabilidad. Método: Para valorar la estabilidad del tronco se analizó tanto la respuesta del tronco ante cargas súbitas aplicadas mediante un mecanismo de tracción neumática, como el control postural del tronco mediante el paradigma del asiento inestable. Para valorar la fuerza y resistencia muscular se realizó un test de flexión y extensión del tronco en un dinamómetro isocinético. Resultados/Conclusiones: Los judocas de categoría internacional mostraron menor desplazamiento del CoP en la tarea más compleja sobre el asiento inestable (7.00±1.19 vs 8.93±1.45 mm; p=.025) y mayor momento de fuerza relativo de la musculatura extensora (7.05±0.87 vs 5.74±0.72 Nm; p=.013) que los judocas de categoría nacional. Según estos resultados, la condición muscular y la estabilidad del tronco son cualidades a tener en cuenta en la preparación física de los judocas. El análisis correlacional no encontró relación entre las variables analizadas, por lo que la fuerza y resistencia muscular no parecen tener un efecto importante sobre el rendimiento en los test de estabilidad del tronco.Palabras clave: Estabilidad del raquis; posturografía; acondicionamiento muscular; dinamometría isocinética; rendimiento deportivo.
Muscular condition and trunk stability in judoka ofnational and international level Abstract Background: It is theorized that the development of the ability to stabilize the trunk may improve the performance of a judoka because it improves body balance control and optimizes force transmission from the lower extremities to the upper limbs. However, there is a lack of scientific evidence to establish a clear relationship between trunk stability and performance in judo. Aim: The purpose of this study was to determine whether the quantification of trunk stability and muscular strength and endurance allowed differentiation between national level (n = 7) and international level judoka (n = 6). In addition, the relationship between trunk stability and muscular strength and endurance of the muscles involved in trunk stability control was analyzed. Method: To assess trunk stability, trunk responses to sudden loads applied by a pneumatic mechanism were Condição muscular e estabilidade do ...
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