Abstract

Principal Component Analysis (PCA) has not been used to assess the principal component (PC) of players´ external training loads (TL) in futsal. In addition, no previous study has analyzed the PC of players´ external TL depending on the half of the match in futsal. Thus, this study aimed to assess the PC of players´ external TL considering an entire official futsal match distinguishing by halves (1^st and 2^nd halves). Two teams of twelve amateur futsal players (Spanish 3^rd division) participated in the final match of the futsal cup and external TL was quantified using eight antennas ultra-wideband technology. Through PCA statistical analysis, 10 variables formed the 10 PC. Specifically, three PC for the entire match, four for the 1^st half, and three for the 2^nd half were extracted. Considering the match as a whole, three PC explained the players´ external TL formed by eight variables: distance covered (m/min), distance covered at high speed running (m/min), distance covered at explosive speed (m/min), total accelerations (n/min), total decelerations between 2-1 m/s/s (n/min), distance covered at 24-50 km/h (m/min), total impacts between 8-100g (n/min) and Jumps performed (n/min). The PC variables differed between halves: a) in the 1^st half 74.5% was explained by four PC composed of 8 variables in total, and b) in the 2^nd half 67.6% was explained by three PC. The results suggest that the use of only one PC could potentially lead to an underestimation of the external TL demands in futsal matches. It seems that a combination of 3-4 PC from a total of 8 to 10 variables are required to explain senior amateur futsal official games. In addition, the match half should be considered to assess the external TL in team sports.

Resumen

El análisis de componentes principales (ACP) no se ha utilizado para conocer los componentes principales (CP) de las cargas de entrenamiento (CE) de los jugadores en fútbol sala. Además, no se han publicado estudios que analicen los CP de la CE de los jugadores en función del período de juego en fútbol sala. Por lo tanto, este estudio tuvo como objetivo evaluar los CP de la CE de los jugadores considerando un partido de fútbol sala oficial diferenciando por períodos. Dos equipos de doce jugadores amateurs de fútbol sala (3^a división española) participaron en una final de la copa de fútbol sala. A través del análisis estadístico de CP, 10 variables formaron los 10 CP. Concretamente, se extrajeron 3 CP para el partido en su totalidad, 4 para el primer período y 3 para el segundo período. Considerando el partido como un todo, 3 CP formados por 8 variables explicaron la CE de los jugadores: Distancia cubierta (m / min), carrera a alta velocidad (m / min), distancia recorrida a velocidad explosiva (m / min), número de aceleraciones totales (n / min), número de desaceleraciones de 2 a 1 m/s (n / min), distancia cubierta de 24 a 50 km/h (m / min), impactos 8-100g (n / min) y saltos (n / min). Las variables de los CP diferían entre períodos: a) en el primer período, 4 CP explicaron el 74.5% de la CE de los jugadores, mientras que b) en el segundo período, 3 CP explicaron el 67.6%. Los resultados sugirieron que el uso de un solo CP podría conducir a una subestimación de las demandas de CE en los partidos de fútbol sala. Parece que se requiere una combinación de 3-4 CP formados por un total de 8 variables para explicar los partidos oficiales de fútbol sala amateur. Además, se debe considerar el ACP por períodos para evaluar el CE en los deportes de equipo.

https://doi.org/10.5232/ricyde2021.06307

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