Abstract

The hamstring strain is one of the most common injuries in soccer. The aim of the study was to describe a new procedure to evaluate the effect of hamstring injuries in kicking in soccer using the principles of inverse dynamics and to compare the results with an isokinetic test. The study focused on evaluating the difference between subjects having a history of hamstring injuries in the last 5 years and those that did not. Seventeen male professional soccer players performed five instep and side- foot kicks which were analysed using a force platform and a Vicon motion-capture system operating at 500Hz. The participants also took part in an isokinetic torque measurement at 60 °/s and 120 °/s. Kinematic variables, ground reaction forces and kinetic variables were compared across the two groups. Significant differences were observed between the previously injured and uninjured group in the time taken for the follow through in the instep kick, and the maximum hip flexion moment in the instep and side-foot kicks. No significant differences were found between the two groups in the traditional isokinetic test. These results indicate that the procedure employed could probably be very useful in the assessment of the effect of hamstring injuries in soccer. Las lesiones musculares del muslo tienen una gran incidencia en el fútbol. El objetivo del estudio
 ha sido desarrollar un nuevo procedimiento para evaluar el efecto de las lesiones de isquiotibiales
 en los golpeos con el pie s en el fútbol utilizando los principios de la dinámica inversa. El trabajo se
 ha centrado en la evaluación de la diferencia entre sujetos que habían sufrido la lesión en los últimos
 5 años y los que no. Se analizaron 17 jugadores de fútbol profesionales realizando cinco tiros con el
 empeine y cinco con el interior del pie. Los movimientos se registraron mediante una plataforma de
 fuerza y un sistema de captura de movimiento Vicon funcionando a 500Hz. Los participantes también
 tomaron parte en una prueba de isocinético en la que se midió el torque isocinético en 60 º/s y 120
 º/s. Se observaron diferencias significativas en los parámetros cinemáticos y cinéticos entre los dos
 grupos (lesionados y no lesionados) en la fase posterior del golpeo y en el instante de máxima flexión
 de cadera. No se encontraron diferencias significativas entre los dos grupos en la prueba isocinética
 tradicional. Estos resultados indican que el procedimiento empleado probablemente podría ser muy
 útil en la evaluación del efecto de las lesiones de isquiotibiales en el fútbol.

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