%0 Journal Article
%T Cognitive function and dynamic cerebral blood flow regulation in multiple concussions
%J Asian journal of sports medicine
%D 2018
%A Kumazaki, Akira
%A Ogoh, Shigehiko
%A Hirasawa, Ai
%A Sakai, Sadayoshi
%A Hirose, Norikazu
%V 9
%N 1
%P e67660-e67660
%X BACKGROUND: Concussion causes acute, short-term brain dysfunctions. However, the impact of repetitive concussion history on brain function remains unclear.   Objectives: The present study examined the effect of a history of multiple concussions on the cognitive functions and dynamic cerebral blood flow (CBF) regulation in collegiate rugby football players.   Methods: Nine male rugby football players with a history of ≤ 1 concussion and nine players with a history of multiple concussions (≥ 4 concussions) participated in this study. Reaction time and working memory were assessed using a neurocognitive assessment device (CogSport; CogState Ltd., Melbourne, Australia). Arterial blood pressure and middle cerebral artery blood velocity (MCAv) were measured continuously throughout the experiment. Dynamic cerebral autoregulation was examined using a thigh-cuff occlusion and release technique.   Results: We found a significant difference in the short-term working memory between players with a history of ≤ 1 concussion and those with a history of multiple concussions (P < 0.05). However, dynamic cerebral autoregulation was not significantly different between the two groups.   Conclusions: We found a dysfunction in the short-term memory function of collegiate rugby football players with a history of multiple concussions. However, this impairment in brain function was not associated with changes in dynamic CBF regulation.   Keywords: Cerebral Blood Flow; Cognition; Head Impact; Collision Sports; Neuropsychological Test  Copyright: Copyright © 2018, Asian Journal of Sports Medicine. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.<p /> <p>Language: en</p>
%G en
%I Tehran University of Medical Sciences
%@ 2008-000X
%U http://dx.doi.org/10.5812/asjsm.67660