Paradoxical heart failure precipitated by profound dehydration: intraventricular dynamic obstruction and significant mitral regurgitation in a volume-depleted heart.

Occurrence of dynamic left ventricular outflow tract (LVOT) obstruction is not infrequent in critically ill patients, and it is associated with potential danger. Here, we report a case of transient heart failure with hemodynamic deterioration paradoxically induced by extreme dehydration. This article describes clinical features of the patient and echocardiographic findings of dynamic LVOT obstruction [...]

By | 2017-05-21T03:14:19+00:00 julio 15th, 2013|Cardiovascular disease, cardiovascular function, Documentos científicos, Hydration and health|Comentarios desactivados en Paradoxical heart failure precipitated by profound dehydration: intraventricular dynamic obstruction and significant mitral regurgitation in a volume-depleted heart.

Effects of hydration on cognitive function of pilots.

The objective of this study was to examine the effect of fluid intake and possible dehydration on cognitive flight performance of pilots. A repeated-measures, counterbalanced, mixed study design was used to examine differences in working memory, spatial orientation, and cognitive flight performance of 40 randomly selected healthy pilots after having high and low fluid intakes. [...]

By | 2017-05-21T03:14:20+00:00 julio 15th, 2013|Documentos científicos, Hydration status of population groups, Mental performance|Comentarios desactivados en Effects of hydration on cognitive function of pilots.

Effect of exercise-induced dehydration on endurance performance: evaluating the impact of exercise protocols on outcomes using a meta-analytic procedure.

OBJECTIVE: It is purported that exercise-induced dehydration (EID), especially if ≥ 2% body weight, impairs endurance performance (EP). Field research shows that athletes can achieve outstanding EP while dehydrated > 2% bodyweight. Using the meta-analytic procedure, this study compared the findings of laboratory-based studies that examined the impact of EID upon EP using either ecologically [...]

By | 2017-05-21T03:14:21+00:00 julio 15th, 2013|Documentos científicos, Exercise and sport, Physical performance|Comentarios desactivados en Effect of exercise-induced dehydration on endurance performance: evaluating the impact of exercise protocols on outcomes using a meta-analytic procedure.

Significant and serious dehydration does not affect skeletal muscle cramp threshold frequency.

OBJECTIVE: Many clinicians believe that exercise-associated muscle cramps (EAMC) occur because of dehydration. Experimental research supporting this theory is lacking. Mild hypohydration (3% body mass loss) does not alter threshold frequency (TF), a measure of cramp susceptibility, when fatigue and exercise intensity are controlled. No experimental research has examined TF following significant (3-5% body mass [...]

By | 2017-05-21T03:14:22+00:00 julio 15th, 2013|Documentos científicos, Hydration status: effects on physiology and metabolism|Comentarios desactivados en Significant and serious dehydration does not affect skeletal muscle cramp threshold frequency.

Influence of progressive fluid restriction on mood and physiological markers of dehydration in women

The present study evaluated, using a well-controlled dehydration protocol, the effects of 24 h fluid deprivation (FD) on selected mood and physiological parameters. In the present cross-over study, twenty healthy women (age 25 (se 0·78) years) participated in two randomised sessions: FD-induced dehydration v. a fully hydrated control condition. In the FD period, the last [...]

By | 2017-05-21T03:14:22+00:00 junio 20th, 2013|Documentos científicos, Hydration status: effects on physiology and metabolism, Mental performance, Physical performance|Comentarios desactivados en Influence of progressive fluid restriction on mood and physiological markers of dehydration in women

Effect of varying the concentrations of carbohydrate and milk protein in rehydration solutions ingested after exercise in the heat.

The present study investigated the relationship between the milk protein content of a rehydration solution and fluid balance after exercise-induced dehydration. On three occasions, eight healthy males were dehydrated to an identical degree of body mass loss (BML, approximately 1•8 %) by intermittent cycling in the heat, rehydrating with 150 % of their BML over [...]

By | 2017-05-21T03:15:30+00:00 junio 20th, 2013|Body water content; body composition, Documentos científicos, Regulation of water and electrolyte balance, Water balance|Comentarios desactivados en Effect of varying the concentrations of carbohydrate and milk protein in rehydration solutions ingested after exercise in the heat.

Increase in skeletal-muscle glycogenolysis and perceived exertion with progressive dehydration during cycling in hydrated men.

This study investigated the effects of progressive mild dehydration during cycling on whole-body substrate oxidation and skeletal-muscle metabolism in recreationally active men. Subjects (N = 9) cycled for 120 min at ~65% peak oxygen uptake (VO2peak 22.7 °C, 32% relative humidity) with water to replace sweat losses (HYD) or without fluid (DEH). Blood samples were [...]

By | 2017-05-21T03:15:31+00:00 junio 20th, 2013|Documentos científicos, Exercise and sport, Hydration status: effects on physiology and metabolism|Comentarios desactivados en Increase in skeletal-muscle glycogenolysis and perceived exertion with progressive dehydration during cycling in hydrated men.

Haemodynamic responses to dehydration in the resting and exercising human leg.

Dehydration and hyperthermia reduces leg blood flow (LBF), cardiac output([Formula: see text]) and arterial pressure during whole-body exercise. It is unknown whether the reductions in blood flow are associated with dehydration-induced alterations in arterial blood oxygen content (C aO2) andO2-dependent signaling. This study investigated the impact of dehydration and concomitant alterations in C aO2 upon [...]

By | 2017-05-21T03:15:33+00:00 junio 20th, 2013|Assessment methodologies, Documentos científicos, Exercise and sport, Hydration and health|Comentarios desactivados en Haemodynamic responses to dehydration in the resting and exercising human leg.

Paradoxical heart failure precipitated by profound dehydration: intraventricular dynamic obstruction and significant mitral regurgitation in a volume-depleted heart.

  Occurrence of dynamic left ventricular outflow tract (LVOT) obstruction is not infrequent in critically ill patients, and it is associated with potential danger. Here, we report a case of transient heart failure with hemodynamic deterioration paradoxically induced by extreme dehydration. This article describes clinical features of the patient and echocardiographic findings of dynamic LVOT [...]

By | 2017-05-21T03:15:34+00:00 junio 20th, 2013|Cardiovascular disease, cardiovascular function, Documentos científicos, Hydration and health|Comentarios desactivados en Paradoxical heart failure precipitated by profound dehydration: intraventricular dynamic obstruction and significant mitral regurgitation in a volume-depleted heart.