The effect of active hypohydration on cognitive function: A systematic review and meta-analysis

Goodman, Stephen P. J.; Moreland, Ashleigh; Marino, Frank E.

doi:10.1016/j.physbeh.2019.03.008

Cited by 36 publications

(26 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1.2 to 4.2%) (372). A recent systematic review also reported an inconsistent effect of dehydration within 1 to 3% of body mass loss on cognitive function, with only 13 of 26 studies demonstrating a negative influence on working memory, inhibitory control and attention (472).…”

Section: Fluid and Sodium Disordersmentioning

confidence: 99%

Exercise under heat stress: thermoregulation, hydration, performance implications, and mitigation strategies

Périard

Eijsvogels²,

Daanen

2021

Physiological Reviews

254

166

View full text Add to dashboard Cite

A rise in body core temperature and loss of body water via sweating are natural consequences of prolonged exercise in the heat. This review provides a comprehensive and integrative overview of how the human body responds to exercise under heat stress and the countermeasures that can be adopted to enhance aerobic performance under such environmental conditions. The fundamental concepts and physiological processes associated with thermoregulation and fluid balance are initially described, followed by a summary of methods to determine thermal strain and hydration status. An outline is provided on how exercise-heat stress disrupts these homeostatic processes, leading to hyperthermia, hypohydration, sodium disturbances and in some cases exertional heat illness. The impact of heat stress on human performance is also examined, including the underlying physiological mechanisms that mediate the impairment of exercise performance. Similarly, the influence of hydration status on performance in the heat and how systemic and peripheral hemodynamic adjustments contribute to fatigue development is elucidated. This review also discusses strategies to mitigate the effects of hyperthermia and hypohydration on exercise performance in the heat, by examining the benefits of heat acclimation, cooling strategies and hyperhydration. Finally, contemporary controversies are summarized and future research directions provided.

show abstract

Section: Fluid and Sodium Disordersmentioning

confidence: 99%

Exercise under heat stress: thermoregulation, hydration, performance implications, and mitigation strategies

Périard

Eijsvogels²,

Daanen

2021

Physiological Reviews

254

166

View full text Add to dashboard Cite

show abstract

“…Maintaining an adequate state of hydration is vital for optimizing human health and performance. Previous literature assessing the role of hydration on exercise performance has demonstrated the detrimental impact of acute hypohydration on aerobic [ 1 , 2 , 3 ] and anaerobic [ 4 , 5 , 6 , 7 ] exercise performance, as well as cognitive function [ 8 , 9 , 10 , 11 ]. In recent years, the focus has shifted from the short-term impact of hypohydration on exercise and cognitive performance to the role that inadequate fluid intake, also termed underhydration [ 12 ], has on health-related outcomes such as obesity [ 3 , 13 , 14 , 15 , 16 , 17 , 18 ], diabetes [ 19 , 20 , 21 ], and chronic kidney disease [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Acute Hypohydration on Indicators of Glycemic Regulation, Appetite, Metabolism and Stress: A Systematic Review and Meta-Analysis

Zaplatosch

Adams

2020

Nutrients

View full text Add to dashboard Cite

Evidence synthesizing the effects of acute body water losses on various markers of glycemic regulation, appetite, metabolism, and stress is lacking. Thus, the purpose of this review was to summarize the response of various hormonal changes involved in these physiologic functions to dehydration. A comprehensive literature search for peer-reviewed research in the databases PubMed, Scopus, CINAHL, and SportDiscus was conducted. Studies were included if they contained samples of adults (>18 years) and experimentally induced dehydration as measured by acute body mass loss. Twenty-one articles were eligible for inclusion. Findings suggested cortisol is significantly elevated with hypohydration (standard mean difference [SMD] = 1.12, 95% CI [0.583, 1.67], p < 0.0001). Testosterone was significantly lower in studies where hypohydration was accompanied by caloric restriction (SMD= −1.04, 95% CI [−1.93, −0.14], p = 0.02), however, there were no changes in testosterone in studies examining hypohydration alone (SMD = −0.17, 95% CI [−0.51 0.16], p = 0.30). Insulin and ghrelin were unaffected by acute total body water losses. Acute hypohydration increases markers of catabolism but has a negligible effect on markers of glycemic regulation, appetite, anabolism and stress. Given the brevity of existing research, further research is needed to determine the impact of hydration on glucagon, leptin, peptide YY and the subsequent outcomes relevant to both health and performance.

show abstract

“…reducing core temperature when a worker is already overheating), but rather helps to limit physiological strain by replacing fluids lost to sweat. Further, as 2% dehydration is the classical threshold for decrements in physical performance [ 146 ], most of the studies analysed had participants dehydrated close to this level but not further [ 67 , 70 , 85 , 91 , 96 , 98 ]. In contrast, protocols extending dehydration between 3 and 4% found reductions in cognitive performance between 23 and 25% [ 147 , 148 ].…”

Section: Discussionmentioning

confidence: 99%

Sustainable solutions to mitigate occupational heat strain – an umbrella review of physiological effects and global health perspectives

et al. 2020

View full text Add to dashboard Cite

Background: Climate change is set to exacerbate occupational heat strain, the combined effect of environmental and internal heat stress on the body, threatening human health and wellbeing. Therefore, identifying effective, affordable, feasible and sustainable solutions to mitigate the negative effects on worker health and productivity, is an increasingly urgent need. Objectives: To systematically identify and evaluate methods that mitigate occupational heat strain in order to provide scientific-based guidance for practitioners. Methods: An umbrella review was conducted in biomedical databases employing the following eligibility criteria: 1) ambient temperatures > 28°C or hypohydrated participants, 2) healthy adults, 3) reported psychophysiological (thermal comfort, heart rate or core temperature) and/or performance (physical or cognitive) outcomes, 4) written in English, and 5) published before November 6, 2019. A second search for original research articles was performed to identify interventions of relevance but lacking systematic reviews. All identified interventions were independently evaluated by all co-authors on four point scales for effectiveness, cost, feasibility and environmental impact. Results: Following screening, 36 systematic reviews fulfilled the inclusion criteria. The most effective solutions at mitigating occupational heat strain were wearing specialized cooling garments, (physiological) heat acclimation, improving aerobic fitness, cold water immersion, and applying ventilation. Although airconditioning and cooling garments in ideal settings provide best scores for effectiveness, the limited applicability in certain industrial settings, high economic cost and high environmental impact are drawbacks for these solutions. However, (physiological) acclimatization, planned breaks, shading and optimized clothing properties are attractive alternative solutions when economic and ecological sustainability aspects are included in the overall evaluation.

show abstract

The effect of active hypohydration on cognitive function: A systematic review and meta-analysis

Cited by 36 publications

References 49 publications

Exercise under heat stress: thermoregulation, hydration, performance implications, and mitigation strategies

Exercise under heat stress: thermoregulation, hydration, performance implications, and mitigation strategies

The Effect of Acute Hypohydration on Indicators of Glycemic Regulation, Appetite, Metabolism and Stress: A Systematic Review and Meta-Analysis

Sustainable solutions to mitigate occupational heat strain – an umbrella review of physiological effects and global health perspectives

Contact Info

Product

Resources

About