Abstract

An association between accelerometer workload and injury risk has been found previously. However, any research has assessed the absorption dynamics of external workload through the measurement in different anatomical locations simultaneously. A cross-sectional study was designed to: (i) to describe the multi-joint external workload profile of youth soccer players, (ii) to identify differences between-participants related to anatomical locations, (iii) to analyze the workload dynamics at different speeds at joints and body segments, (iv) to characterize the multi-joint individual workload and the within-participants difference in each body segment. Twenty-one U-18 male players, that were part of a Youth Spanish First Division soccer team, performed an incremental running treadmill test and wore four WIMU PRO^TM inertial devices in lower limb (ankle-knee) and spine (lower-upper back) locations to register cumulative tri-axial accelerometry-based workload (PlayerLoad, PL_RT). The main results have shown that the highest PL_RT was detected at the lower limb, especially at the ankle. Different dynamics of accelerometer workload have been found between lower and upper limb, being them between ankle-knee at 12-km/h and lower-upper back at 9.5-km/h (p<.05). Between-participants’ differences were shown at all joints, finding the highest differences at the upper back (p<.01; d=2.17). Finally, the body segment knee-lower back reported the highest differences (%_diff=34.25-to-67.28; d=2.20-to-4.77). In conclusion, a great between-participants external workload variability was found at joints and body segments, being recommended for an individualized assessment and specific training protocols.

Resumen

Una asociación entre la carga acelerometría y el riesgo de lesión ha sido encontrada previamente. Sin embargo, no existen investigaciones que evalúen la dinámica de absorción de carga externa a través de diferentes ubicaciones anatómicas simultáneamente. Un estudio transversal fue diseñado para: (i) describir el perfil multi-ubicación de carga externa en jugadores jóvenes de fútbol, (ii) identificar diferencias entre sujetos relacionadas con las ubicaciones anatómicas, (iii) analizar la dinámica de carga a diferentes velocidades en diferentes ubicaciones anatómicas y segmentos corporales, (iv) caracterizar el perfil multi-ubicación individual y las diferencias intra-sujeto en cada segmento corporal. 21 jugadores masculinos U-18 que pertenecían a un equipo de fútbol de Primera División Nacional Juvenil realizaron un test incremental en tapiz rodante portando cuatro dispositivos inerciales WIMU PRO^TM en diferentes ubicaciones del tren inferior (rodilla-tobillo) y columna (espalda alta y baja) para registrar la carga acelerométrica tri-axial acumulada (PlayerLoad, PL_RT). Los principales resultados muestran que el mayor PL_RT fue detectando en el tren inferior, especialmente en el tobillo. Diferentes dinámicas de carga acelerométrica han sido encontrados entre el tren inferior y el tren superior, siendo estas diferencias entre tobillo-rodilla a 12 km/h y entre espalda alta-baja a 9.5 km/h (p<.05). Diferencias inter-sujeto fueron encontradas en todas las ubicaciones, encontrando las mayores diferencias en la espalda alta (p<.01; d=2.17). Finalmente, el segmento corporal rodilla-espalda baja reportó las mayores diferencias (%_diff=34.25-to-67.28; d=2.20-to-4.77). En conclusión, una alta variabilidad inter-sujeto en la carga externa registrada fue encontrada en todas las ubicaciones y segmentos corporales, siendo recomendable su individualización y entrenamiento específico.

https://doi.org/10.5232/ricyde2021.06402

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testing; accelerometry; musculoskeletal workload; team sports; evaluación; acelerometría; carga musculoesquelética; deportes de equipo.