@article{ref1,
title="A dose-response relation of headers and concussions with cognitive impairment in professional soccer players",
journal="Journal of clinical and experimental neuropsychology",
year="2001",
author="Matser, J. T. and Kessels, A. G. and Lezak, M. D. and Troost, J.",
volume="23",
number="6",
pages="770-774",
abstract="The purpose of this study was to determine the effects of headers and concussions on cognitive impairment in professional soccer players. A group of 84 active professional soccer players from several premier league soccer clubs underwent neuropsychological evaluations. The dose-response relation between the number of headers in one professional season and the number of soccer-related concussions on cognitive functioning was investigated. It was found that the number of headers in one season was related to poorer results on tests measuring focused attention and visual/verbal memory. Soccer-related concussions were related to poorer results on tests measuring sustained attention and visuoperceptual processing. The findings suggest that headers as well as concussions separately contribute to cognitive impairment.<p /><p>Language: en</p>",
language="en",
issn="1380-3395",
doi="10.1076/jcen.23.6.770.1029",
url="http://dx.doi.org/10.1076/jcen.23.6.770.1029"
}