Minor degree of hypohydration adversely influences cognition: a mediator analysis

Benton, David; Jenkins, K. T.; Watkins, H. T.; Young, Hayley

doi:10.3945/ajcn.116.132605

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Minor degree of hypohydration adversely influences cognition: a mediator analysis

David Benton, K. T. Jenkins, H. T. Watkins, Hayley Young

American Journal of Clinical Nutrition, Volume: 104, Pages: 603 - 612

Swansea University Authors: David Benton, Hayley Young

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DOI (Published version): 10.3945/ajcn.116.132605

Abstract

Background: The assumption that small changes in hydration statusare readily compensated by homeostatic mechanisms has been littlestudied. In this study, the influence of hypohydration on cognition wasexamined.Objectives: We assessed whether a loss of ,1% of body mass dueto hypohydration adversely i...

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Published in:	American Journal of Clinical Nutrition
ISSN:	0002-9165
Published:	2016
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URI:	https://cronfa.swan.ac.uk/Record/cronfa29683
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spelling	2020-12-09T09:55:06.7699056 v2 29683 2016-09-01 Minor degree of hypohydration adversely influences cognition: a mediator analysis 7845ee79286c74b7939198c94e9e16ff David Benton David Benton true false 22748f1a953255d63cb6ab9a98c11d70 Hayley Young Hayley Young true false 2016-09-01 FGMHL Background: The assumption that small changes in hydration statusare readily compensated by homeostatic mechanisms has been littlestudied. In this study, the influence of hypohydration on cognition wasexamined.Objectives: We assessed whether a loss of ,1% of body mass dueto hypohydration adversely influenced cognition, and examined thepossible underlying mechanisms.Design: A total of 101 individuals were subjected to a temperature of308C for 4 h and randomly either did or did not consume 300 mLH2O during that period. Changes in body mass, urine osmolality,body temperature, and thirst were monitored. Episodic memory, focusedattention, mood, and the perceived difficulty of tasks weremeasured on 3 occasions. The data were analyzed with the use ofa regression-based approach whereby we looked for variables that mediatedthe influence of hypohydration on psychological functioning.Results: Drinking water improved memory and focused attention.In the short-term, thirst was associated with poorer memory. Later,a greater loss of body mass was associated with poorer memory andattention (mean loss: 0.72%). At 90 min, an increase in thirst wasassociated with a decline in subjective energy and increased anxietyand depression, effects that were reduced by drinking water. At180 min, subjects found the tests easier if they had consumed water.Conclusions: Drinking water was shown, for the first time to ourknowledge, to benefit cognitive functioning when there was a lossof ,1% body mass at levels that may occur during everydayliving. Establishing the variables that generate optimal fluid consumptionwill help to tailor individual advice, particularly in clinicalsituations. Journal Article American Journal of Clinical Nutrition 104 603 612 0002-9165 attention, cognition, dehydration, hypohydration, memory 31 12 2016 2016-12-31 10.3945/ajcn.116.132605 COLLEGE NANME Medicine, Health and Life Science - Faculty COLLEGE CODE FGMHL Swansea University 2020-12-09T09:55:06.7699056 2016-09-01T09:22:28.4532276 Faculty of Medicine, Health and Life Sciences School of Psychology David Benton 1 K. T. Jenkins 2 H. T. Watkins 3 Hayley Young 4 0029683-14102016114950.pdf 2016-Benton-603-12.pdf 2016-10-14T11:49:50.8170000 Output 905162 application/pdf Version of Record true 2016-10-14T00:00:00.0000000 This is a free access article, distributed under terms (http://www.nutrition.org/publications/guidelines-and-policies/license/) that permit unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited. true eng
title	Minor degree of hypohydration adversely influences cognition: a mediator analysis
spellingShingle	Minor degree of hypohydration adversely influences cognition: a mediator analysis David Benton Hayley Young
title_short	Minor degree of hypohydration adversely influences cognition: a mediator analysis
title_full	Minor degree of hypohydration adversely influences cognition: a mediator analysis
title_fullStr	Minor degree of hypohydration adversely influences cognition: a mediator analysis
title_full_unstemmed	Minor degree of hypohydration adversely influences cognition: a mediator analysis
title_sort	Minor degree of hypohydration adversely influences cognition: a mediator analysis
author_id_str_mv	7845ee79286c74b7939198c94e9e16ff 22748f1a953255d63cb6ab9a98c11d70
author_id_fullname_str_mv	7845ee79286c74b7939198c94e9e16ff_*_David Benton 22748f1a953255d63cb6ab9a98c11d70_*_Hayley Young
author	David Benton Hayley Young
author2	David Benton K. T. Jenkins H. T. Watkins Hayley Young
format	Journal article
container_title	American Journal of Clinical Nutrition
container_volume	104
container_start_page	603
publishDate	2016
institution	Swansea University
issn	0002-9165
doi_str_mv	10.3945/ajcn.116.132605
college_str	Faculty of Medicine, Health and Life Sciences
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hierarchy_top_title	Faculty of Medicine, Health and Life Sciences
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department_str	School of Psychology{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}School of Psychology
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description	Background: The assumption that small changes in hydration statusare readily compensated by homeostatic mechanisms has been littlestudied. In this study, the influence of hypohydration on cognition wasexamined.Objectives: We assessed whether a loss of ,1% of body mass dueto hypohydration adversely influenced cognition, and examined thepossible underlying mechanisms.Design: A total of 101 individuals were subjected to a temperature of308C for 4 h and randomly either did or did not consume 300 mLH2O during that period. Changes in body mass, urine osmolality,body temperature, and thirst were monitored. Episodic memory, focusedattention, mood, and the perceived difficulty of tasks weremeasured on 3 occasions. The data were analyzed with the use ofa regression-based approach whereby we looked for variables that mediatedthe influence of hypohydration on psychological functioning.Results: Drinking water improved memory and focused attention.In the short-term, thirst was associated with poorer memory. Later,a greater loss of body mass was associated with poorer memory andattention (mean loss: 0.72%). At 90 min, an increase in thirst wasassociated with a decline in subjective energy and increased anxietyand depression, effects that were reduced by drinking water. At180 min, subjects found the tests easier if they had consumed water.Conclusions: Drinking water was shown, for the first time to ourknowledge, to benefit cognitive functioning when there was a lossof ,1% body mass at levels that may occur during everydayliving. Establishing the variables that generate optimal fluid consumptionwill help to tailor individual advice, particularly in clinicalsituations.
published_date	2016-12-31T03:36:07Z
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Minor degree of hypohydration adversely influences cognition: a mediator analysis

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