Dehydration and Cognitive Performance

Grandjean, Ann C.; Grandjean, Nicole R.

doi:10.1080/07315724.2007.10719657

Cited by 170 publications

(111 citation statements)

References 13 publications

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“…For the central nervous system to function well, it needs sufficient amounts of water, vitamins such as folate, thiamine, vitamins B 6 and B 12 , a-lipoic acid, lutein and n-3 fatty acids (FA) (7,8) . Walnuts contain a number of potentially neuroprotective compounds like vitamin E, folate, melatonin, numerous polyphenolics and significant amounts of n-3 a-linolenic acid (ALA; 18 : 3n-3) (9 -12) .…”

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confidence: 99%

Effects of walnut consumption on cognitive performance in young adults

et al. 2011

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Walnuts contain a number of potentially neuroprotective compounds like vitamin E, folate, melatonin, several antioxidative polyphenols and significant amounts of n-3 a-linolenic fatty acid. The present study sought to determine the effect of walnuts on verbal and non-verbal reasoning, memory and mood. A total of sixty-four college students were randomly assigned to two treatment sequences in a crossover fashion: walnuts -placebo or placebo -walnuts. Baseline data were collected for non-verbal reasoning, verbal reasoning, memory and mood states. Data were collected again after 8 weeks of intervention. After 6 weeks of washout, the intervention groups followed the diets in reverse order. Data were collected once more at the end of the 8-week intervention period. No significant increases were detected for mood, non-verbal reasoning or memory on the walnut-supplemented diet. However, inferential verbal reasoning increased significantly by 11·2 %, indicating a medium effect size (P¼ 0·009; d ¼ 0·567). In young, healthy, normal adults, walnuts do not appear to improve memory, mood or non-verbal reasoning abilities. However, walnuts may have the ability to increase inferential reasoning.

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confidence: 99%

Effects of walnut consumption on cognitive performance in young adults

et al. 2011

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“…Em estudo realizado com praticantes de remo mostra a relação entre a elevação de FC e a desidratação com a diminuição no plasma sanguíneo, demonstrando que saber quando e por que o cardiovascular drift ocorre é um fator importante na melhoria do desempenho e do método de treinamento 44 . Descuidos no consumo de líquidos, durante o exercício, podem provocar danos na função cognitiva-motora 45,46 . Parece que decréscimos no desempenho cognitivo-motor podem ocorrer quando 2% ou mais da MC é perdida devido à restrição de líquidos ou esforço físico 46 .…”

Section: Discussionunclassified

“…Descuidos no consumo de líquidos, durante o exercício, podem provocar danos na função cognitiva-motora 45,46 . Parece que decréscimos no desempenho cognitivo-motor podem ocorrer quando 2% ou mais da MC é perdida devido à restrição de líquidos ou esforço físico 46 . Dependendo do aspecto a ser mensurado, o prejuízo físico e cognitivo-motor podem ser aparentes depois de 1 % da perda de MC 6 .…”

Section: Discussionunclassified

Impacto Da Reposição Hídrica Com Água De Coco Sobre O Estado De Hidratação E Cardiovascular Drift Durante O Exercício

Chagas¹,

Souza²,

Santos³

et al. 2017

J. Phys. Educ.

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RESUMOO objetivo desse estudo foi avaliar o impacto da reposição hídrica com água de coco sobre o estado de hidratação e cardiovascular drift durante o exercício. Treze voluntários do sexo masculino realizaram três sessões de exercício em cicloergômetro, submetidos a formas distintas de hidratação: grupo sem água (SA); grupo com água (CA); e grupo água de coco (CAC). O estado de hidratação foi determinado por alterações percentuais na massa corporal (∆ %MC) e urina. A frequência cardíaca (FC) foi registrada para avaliar o cardiovascular drift. Houve um aumento significativo da desidratação no grupo SA (∆ %MC = -1,43 ± 0,15), comparado aos grupos CA (∆ %MC = -0,68 ± 0,15) e CAC (∆ % MC = -0,70 ± 0,19). O grupo SA demonstrou aumentos significativos da FC comparado aos outros grupos. Conclui-se que a água de coco favoreceu a hidratação e a redução da FC, evitando o cardiovascular drift, mas com impacto similar à água. Palavras-chave: Desidratação. Exercício. Frequência Cardíaca. ABSTRACTThe purpose of this study was to evaluate the impact of fluid replacement with coconut water on the hydration status and cardiovascular drift during exercise. Thirteen male volunteers performed three sessions of exercise in bicycle ergometer, submitted to different forms of fluid replacement: no water intake (NW) group; with water intake (WW) group; and with coconut water (WCW) group. Hydration status was determined by percentage body mass changes (∆ % BM) and urine. Heart rate (HR) was recorded to evaluate the cardiovascular drift. There was a significant increase of dehydration in the NW group(∆ % BM = -1.43 ± 0.15) compared with WW(∆ % BM = -0.68 ± 0.15) and WCW groups(∆ % BM = -0.70 ± 0.19). The NW group showed significant increases in HR compared to other groups. It was concluded that coconut water promotes hydration and HR reduction, preventing cardiovascular drift, but similar to water impact. Keywords: Dehydration. Exercise. Heart Rate. IntroduçãoO cardiovascular drift é caracterizado pelo aumento exacerbado da frequência cardíaca (FC), acompanhado pela redução do volume de ejeção (VE) e fluxo sanguíneo para o músculo exercitado em estado de desidratação 1 . Sabe-se que tal condição pode promover alterações na prescrição do exercício e desempenho 2 . Obviamente, a intensidade, a duração do exercício, a aclimatação ao calor e o estado de hidratação vão ditar a extensão do cardiovascular drift 3 . Assim, manter uma hidratação adequada é importante para que não seja desencadeado o cardiovascular drift durante as sessões de exercícios, especialmente em atletas sob situações de estresse térmico 4 . Porém, independentemente do estresse térmico e do atleta, sabe-se que a manutenção do estado de hidratação adequado é fundamental para a saúde e desempenho de todos os praticantes de exercício 5 . O ideal seria definir estratégias de hidratação, para evitar o estado de desidratação cumulativo e progressivo 6,7 . A utilização de marcadores simples como alteração

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“…In addition, they were asked to avoid consuming any caffeinated food and beverages and to drink at least 1 liter of water in the 2 hours prior to testing to assist with maintaining adequate hydration status. Dehydration has been associated with impairment in cognitive functions and mood, which may influence driving performance (Grandjean & Grandjean, 2007;Lieberman, 2010). Prior to completing test drives, all participants completed a 10 min familiarization drive on the simulator to become accustomed to the controls and driving in the virtual environment.…”

Section: Methodsmentioning

confidence: 99%

Test-Retest Reliability of Simulated Driving Performance: A Pilot Study

Irwin

Shum

Leveritt

et al. 2013

Proceedings of the 7th International Driving Symposium on Human Factors in Driver Assessment, Training, and Vehicle Design : Dr

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Summary: Twenty-seven volunteers completed three simulated driving tests to determine test-retest reliability of performance on a low-cost, fixed-base computerized driving simulator. One retest was completed a few hours after the initial drive, and the final retest was completed 7 days following the initial test drive. Driving performance was compared using measures of vehicle control, speed, and reaction time to critical events. A measure of participants' ability to inhibit a pre-potent response was also assessed using an inhibition task during each drive, with the number of incorrect inhibition responses recorded. Practice effects were evident for measures of vehicle control (deviation of lane position and number of line crossings) and participants' ability to withhold responses to inhibition tasks. Good test-retest reliability was observed for measures of vehicle control, speed, reaction time, and variability measures. Poor test-retest reliability was observed for the number of stopping failures observed during driving. The findings from this study suggest that the driving scenario used provides reliable assessment tasks that could be used to track the effects of pharmacological treatments on driving performance. However, an additional familiarization drive should be included as part of future study protocols employing this driving scenario to reduce learning effects during trials. Care should also be taken when interpreting results from tasks with low test-retest reliability.

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Dehydration and Cognitive Performance

Cited by 170 publications

References 13 publications

Effects of walnut consumption on cognitive performance in young adults

Effects of walnut consumption on cognitive performance in young adults

Impacto Da Reposição Hídrica Com Água De Coco Sobre O Estado De Hidratação E Cardiovascular Drift Durante O Exercício

Test-Retest Reliability of Simulated Driving Performance: A Pilot Study

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