@Article{Moreira2017,
journal="Biology of Sport",
issn="0860-021X",
volume="34",
number="4",
year="2017",
title="Is the technical performance of young soccer players influenced by hormonal status, sexual maturity, anthropometric profile, and physical performance?",
abstract="The aim of this study was to examine the influence of hormonal status, anthropometric profile, sexual maturity level, and physical performance on the technical abilities of 40 young male soccer players during small-sided games (SSGs). Anthropometric profiling, saliva sampling, sexual maturity assessment (Tanner scale), and physical performance tests (Yo-Yo and vertical jumps) were conducted two weeks prior to the SSGs. Salivary  testosterone was determined by the enzyme-linked immunosorbent assay method. Technical performance was determined by the frequency of actions during SSGs. Principal component analyses identified four technical  actions of importance: total number of passes, effectiveness, goal attempts, and total tackles. A multivariate canonical correlation analysis was then employed to verify the prediction of a multiple dependent variables set (composed of four technical actions) from an independent set of variables, composed of testosterone concentration, stage of pubic hair and genitalia development, vertical jumps and Yo-Yo performance. A moderate-to-large  relationship between the technical performance set and the independent set was observed. The canonical correlation was 0.75 with a canonical R2 of 0.45. The highest structure coefficient in the technical performance  set was observed for tackles (0.77), while testosterone presented the highest structure coefficient (0.75) for the variables of the independent set. The current data suggest that the selected independent set of variables might  be useful in predicting SSG performance in young soccer players. Coaches should be aware that physical development plays a key role in technical performance to avoid decision-making mistakes during the selection of young players.",
author="Moreira, Alexandre
and Massa, Marcelo
and Thiengo, Carlos R.
and Lopes, Rafael Alan Rodrigues
and Lima, Marcelo R.
and Vaeyens, Roel
and Barbosa, Wesley P.
and Aoki, Marcelo S.",
pages="305--311",
doi="10.5114/biolsport.2017.69817",
url="http://dx.doi.org/10.5114/biolsport.2017.69817"
}