TY  - JOUR
PY  - 2018//
TI  - Cognitive function and dynamic cerebral blood flow regulation in multiple concussions
JO  - Asian journal of sports medicine
A1  - Kumazaki, Akira
A1  - Ogoh, Shigehiko
A1  - Hirasawa, Ai
A1  - Sakai, Sadayoshi
A1  - Hirose, Norikazu
SP  - e67660
EP  - e67660
VL  - 9
IS  - 1
N2  - 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>
LA  - en
SN  - 2008-000X
UR  - http://dx.doi.org/10.5812/asjsm.67660
ID  - ref1
ER  -