Hydration and cognitive performance

Secher, Marion; Ritz, Patrick

doi:10.1007/s12603-012-0033-0

Cited by 33 publications

(22 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Especially in geriatric patients, water-loss dehydration is associated with poor health outcomes, including falls, fractures, constipation, confusion, drug toxicity, and death [3]. Available studies especially suggest a relationship between hydration status and cognitive performance [4, 5]. Therefore, interventions to improve fluid intake in aged care receivers and geriatric patients are considered of utmost importance [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fluid Intake on Hydration Status and Skin Barrier Characteristics in Geriatric Patients: An Explorative Study

Akdeniz

Boeing

Müller‐Werdan

et al. 2018

Skin Pharmacol Physiol

View full text Add to dashboard Cite

Background/Aim: Inadequate fluid intake is assumed to be a trigger of water-loss dehydration, which is a major health risk in aged and geriatric populations. Thus, there is a need to search for easy to use diagnostic tests to identify dehydration. Our overall aim was to investigate whether skin barrier parameters could be used for predicting fluid intake and/or hydration status in geriatric patients. Methods: An explorative observational comparative study was conducted in a geriatric hospital including patients aged 65 years and older. We measured 3-day fluid intake, skin barrier parameters, Overall Dry Skin Score, serum osmolality, cognitive and functional health, and medications. Results: Forty patients were included (mean age 78.45 years and 65% women) with a mean fluid intake of 1,747 mL/day. 20% of the patients were dehydrated and 22.5% had an impending dehydration according to serum osmolality. Multivariate analysis suggested that skin surface pH and epidermal hydration at the face were associated with fluid intake. Serum osmolality was associated with epidermal hydration at the leg and skin surface pH at the face. Fluid intake was not correlated with serum osmolality. Diuretics were associated with high serum osmolality. Conclusions: Approximately half of the patients were diagnosed as being dehydrated according to osmolality, which is the current reference standard. However, there was no association with fluid intake, questioning the clinical relevance of this measure. Results indicate that single skin barrier parameters are poor markers for fluid intake or osmolality. Epidermal hydration might play a role but most probably in combination with other tests.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Fluid Intake on Hydration Status and Skin Barrier Characteristics in Geriatric Patients: An Explorative Study

Akdeniz

Boeing

Müller‐Werdan

et al. 2018

Skin Pharmacol Physiol

View full text Add to dashboard Cite

show abstract

“…For instance, dehydration has well established negative effects on cognitive performance (see Edmonds, 2012, for a review). In adults, dehydration to a loss of more than 2% body weight, induced by heat exposure or exercise, results in poor performance on tasks assessing memory and psychomotor performance (Gopinathan, Pichan, & Sharma, 1988;Sharma, Sridharan, Pichan, & Panwar, 1986); although see Secher and Ritz (2012) for a discussion of methodological limitations. Subjective feelings of concentration and alertness are also negatively affected (Armstrong et al, 2012;Shirrefs, Merson, Fraser, & Archer, 2004;Szinnai, Schachinger, Arnaud, Linder, & Keller, 2005).…”

Section: Introductionmentioning

confidence: 99%

Water consumption, not expectancies about water consumption, affects cognitive performance in adults

et al. 2013

View full text Add to dashboard Cite

Research has shown that water supplementation positively affects cognitive performance in children and adults. The present study considered whether this could be a result of expectancies that individuals have about the effects of water on cognition. Forty seven participants were recruited and told the study was examining the effects of repeated testing on cognitive performance. They were assigned either to a condition in which positive expectancies about the effects of drinking water were induced, or a control condition in which no expectancies were induced. Within these groups, approximately half were given a drink of water, while the remainder were not. Performance on a thirst scale, letter cancellation, digit span forwards and backwards and a simple reaction time task was assessed at baseline (before the drink) and 20 minutes and 40 minutes after water consumption. Effects of water, but not expectancy, were found on subjective thirst ratings and letter cancellation task performance, but not on digit span or reaction time. This suggests that water consumption effects on letter cancellation are due to the physiological effects of water, rather than expectancies about the effects of drinking water.

show abstract

“…As the effect sizes are divergent between different types of cognitive tasks (Hancock and Vasmatzidis 2003;Secher and Ritz 2012) and because there is a lack of studies empirically relating cognitive work performance to heat stress, our models could not cover such effects quantitatively. Additional developments will emerge from the ongoing European Heat-Shield project (www.Heat-Shield.eu), with new estimates of workability risk functions still to be published (Kjellstrom et al this special issue), potentially including the beneficial effects of heat stress mitigation measures (Gao et al this special issue).…”

Section: Limitations and Outlookmentioning

confidence: 99%

Estimated work ability in warm outdoor environments depends on the chosen heat stress assessment metric

et al. 2017

View full text Add to dashboard Cite

With a view to occupational effects of climate change, we performed a simulation study on the influence of different heat stress assessment metrics on estimated workability (WA) of labour in warm outdoor environments. Whole-day shifts with varying workloads were simulated using as input meteorological records for the hottest month from four cities with prevailing hot (Dallas, New Delhi) or warm-humid conditions (Managua, Osaka), respectively. In addition, we considered the effects of adaptive strategies like shielding against solar radiation and different work-rest schedules assuming an acclimated person wearing light work clothes (0.6 clo). We assessed WA according to Wet Bulb Globe Temperature (WBGT) by means of an empirical relation of worker performance from field studies (Hothaps), and as allowed work hours using safety threshold limits proposed by the corresponding standards. Using the physiological models Predicted Heat Strain (PHS) and Universal Thermal Climate Index (UTCI)-Fiala, we calculated WA as the percentage of working hours with body core temperature and cumulated sweat loss below standard limits (38 °C and 7.5% of body weight, respectively) recommended by ISO 7933 and below conservative (38 °C; 3%) and liberal (38.2 °C; 7.5%) limits in comparison. ANOVA results showed that the different metrics, workload, time of day and climate type determined the largest part of WA variance. WBGT-based metrics were highly correlated and indicated slightly more constrained WA for moderate workload, but were less restrictive with high workload and for afternoon work hours compared to PHS and UTCI-Fiala. Though PHS showed unrealistic dynamic responses to rest from work compared to UTCI-Fiala, differences in WA assessed by the physiological models largely depended on the applied limit criteria. In conclusion, our study showed that the choice of the heat stress assessment metric impacts notably on the estimated WA. Whereas PHS and UTCI-Fiala can account for cumulative physiological strain imposed by extended work hours when working heavily under high heat stress, the current WBGT standards do not include this. Advanced thermophysiological models might help developing alternatives, where not only modelling details but also the choice of physiological limit criteria will require attention. There is also an urgent need for suitable empirical data relating workplace heat exposure to workability.

show abstract

Hydration and cognitive performance

Cited by 33 publications

References 25 publications

Effect of Fluid Intake on Hydration Status and Skin Barrier Characteristics in Geriatric Patients: An Explorative Study

Effect of Fluid Intake on Hydration Status and Skin Barrier Characteristics in Geriatric Patients: An Explorative Study

Water consumption, not expectancies about water consumption, affects cognitive performance in adults

Estimated work ability in warm outdoor environments depends on the chosen heat stress assessment metric

Contact Info

Product

Resources

About