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Title: Mild hypohydration increases the frequency of driver errors during a prolonged, monotonous driving task
Authors: Watson, Phillip
Whale, Andy
Mears, Stephen A.
Reyner, Louise A.
Maughan, Ronald J.
Keywords: Cognitive function
Fluid balance
Road traffic accident
Issue Date: 2015
Publisher: © The Authors. Published by Elsevier
Citation: WATSON, P. ...et al., 2015. Mild hypohydration increases the frequency of driver errors during a prolonged, monotonous driving task. Physiology & Behavior, 147, pp. 313-318.
Abstract: The aim of the present study was to examine the effect of mild hypohydration on performance during a prolonged, monotonous driving task. Methods: Eleven healthy males (age 22 ± 4 y) were instructed to consume a volume of fluid in line with published guidelines (HYD trial) or 25% of this intake (FR trial) in a crossover manner. Participants came to the laboratory the following morning after an overnight fast. One hour following a standard breakfast, a 120 min driving simulation task began. Driver errors, including instances of lane drifting or late breaking, EEG and heart rate were recorded throughout the driving task. Results: Pre-trial bodymass (P=0.692), urine osmolality (P=0.838) and serumosmolality (P=0.574)were the same on both trials. FR resulted in a 1.1±0.7% reduction in bodymass, compared to−0.1±0.6% in the HYD trial (P = 0.002). Urine and serum osmolality were both increased following FR (P b 0.05). There was a progressive increase in the total number of driver errors observed during both the HYD and FR trials, but significantly more incidents were recorded throughout the FR trial (HYD 47 ± 44, FR 101 ± 84; ES = 0.81; P = 0.006). Conclusions: The results of the present study suggest that mild hypohydration, produced a significant increase in minor driving errors during a prolonged, monotonous drive, compared to that observed while performing the same task in a hydrated condition. The magnitude of decrement reported,was similar to that observed following the ingestion of an alcoholic beverage resulting in a blood alcohol content of approximately 0.08% (the current UK legal driving limit), or while sleep deprived.
Description: This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution -NonCommercial-NoDerivatives 4.0 Unported Licence (CC BY-NC-ND). Full details of this licence are available at: http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor: This work was funded in part by a grant from the European Hydration Institute (EHI).
Version: Published
DOI: 10.1016/j.physbeh.2015.04.028
URI: https://dspace.lboro.ac.uk/2134/20400
Publisher Link: http://dx.doi.org/10.1016/j.physbeh.2015.04.028
ISSN: 0031-9384
Appears in Collections:Published Articles (Sport, Exercise and Health Sciences)

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