Phillip Watson1, Andrew Whale2, Stephen A Mears3, Louise A Reyner2, Ronald J Maughan3. 1. School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire LE11 3TU, UK; Department of Human Physiology, Vrije Universiteit Brussel, Brussels B-1050, Belgium. Electronic address: pwatson@vub.ac.be. 2. School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire LE11 3TU, UK; Sleep Research Centre, Loughborough University, Leicestershire LE11 3TU, UK. 3. School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire LE11 3TU, UK.
Abstract
UNLABELLED: 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±4y) 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 120min 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 body mass (P=0.692), urine osmolality (P=0.838) and serum osmolality (P=0.574) were the same on both trials. FR resulted in a 1.1±0.7% reduction in body mass, compared to -0.1±0.6% in the HYD trial (P=0.002). Urine and serum osmolality were both increased following FR (P<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.
RCT Entities:
UNLABELLED: 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±4y) 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 120min 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 body mass (P=0.692), urine osmolality (P=0.838) and serum osmolality (P=0.574) were the same on both trials. FR resulted in a 1.1±0.7% reduction in body mass, compared to -0.1±0.6% in the HYD trial (P=0.002). Urine and serum osmolality were both increased following FR (P<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.
Authors: Lee Hooper; Diane K Bunn; Alice Downing; Florence O Jimoh; Joyce Groves; Carol Free; Vicky Cowap; John F Potter; Paul R Hunter; Lee Shepstone Journal: J Gerontol A Biol Sci Med Sci Date: 2015-11-09 Impact factor: 6.053
Authors: Jacob F Piil; Jesper Lundbye-Jensen; Lasse Christiansen; Leonidas Ioannou; Lydia Tsoutsoubi; Constantinos N Dallas; Konstantinos Mantzios; Andreas D Flouris; Lars Nybo Journal: PLoS One Date: 2018-10-24 Impact factor: 3.240