Disorders of water metabolism.
No abstract available.
THE IMPORTANCE OF GOOD HYDRATION FOR THE PREVENTION OF CHRONIC DISEASES.
There is increasing evidence that mild dehydration plays a role in the development of various morbidities. In this review, the effects of hydration status on chronic diseases are categorized according to the strength of the evidence. Positive effects of maintenance of good hydration are shown for urolithiasis (category lb evidence); constipation, exercise asthma, hypertonic dehydration [...]
Recent advances in the understanding of water metabolism in heart failure.
Hyponatremia is common in advanced heart failure and relates to the severity of the disease. Non-osmotic arginine vasopressin (AVP) release and biosynthesis have been shown to be increased during chronic cardiac failure (CHF) and baroreceptors pathways have been demonstrated to play a major role in this non-osmotic stimulation of AVP. Decreased cardiac output unloads the [...]
The clinical physiology of water metabolism. Part III: The water depletion (hyperosmolar) and water excess (hyposmolar) syndromes.
Hyperosmolality occurs when there are defects in the two major homeostatic mechanisms required for water balance-thirst and arginine vasopressin (AVP) release. In this situation hypotonic fluids are lost in substantial quantities causing depletion of both intracellular and extracellular fluid compartments. Patients with essential hypernatremia have defective osmotically stimulated AVP release and thirst but may have [...]
DEHYDRATION ENHANCES ENDOTOXIN FEVER BY INCREASED PRODUCTION OF ENDOGENOUS PYROGEN
The febrile responses in rats to an intravenous injection of the bacterial endotoxin Salmonella typhosa were investigated under normally hydrated and dehydrated conditions. When endotoxin was injected intravenously into the dehydrated rats, a biphasic-patterned fever resulted, whereas in normal rats an intravenous injection of endotoxin did not induce fever. No significant differences in febrile responses [...]
Electrolyte & water metabolism in sports activities.
Few studies in water and electrolyte metabolism during sports activities have directed attention to magnesium. Addition of magnesium to sports beverages in appropriate concentrations appears to be safe. This article considers the potential role and availability of magnesium in fluid repletion during sports activities
The clinical physiology of water metabolism. Part II: Renal mechanisms for urinary concentration; diabetes insipidus.
The renal reabsorption of water independent of solute is the result of the coordinated function of the collecting duct and the ascending limb of the loop of Henle. The unique juxtaposition of the ascending and descending portions of the loop of Henle and of the vasa recta permits the function of a counter-current multiplier system [...]
HYPOHYDRATION EFFECT ON FINGER SKIN TEMPERATURE AND BLOOD FLOW DURING COLD-WATER FINGER IMMERSION
This study was conducted to determine whether hypohydration (Hy) alters blood flow, skin temperature, or cold-induced vasodilation (CIVD) during peripheral cooling. Fourteen subjects sat in a thermoneutral environment (27 degrees C) during 15-min warm-water (42 degrees C) and 30-min cold-water (4 degrees C) finger immersion (FI) while euhydrated (Eu) and, again, during Hy. Hy (-4% [...]
A review of fluid and hydration in competitive tennis.
Hypohydration is known to impair performance and increases the risk of heat injury. Therefore, the consumption of appropriate fluid volumes before, during, and after tennis play is important to maintain physiological homeostasis and performance. Tennis is a sport that typically has points lasting fewer than ten seconds, with short-to-moderate rest periods between each work bout. [...]
Effects of an electrolyte additive on hydration and drinking behavior during wildfire suppression.
OBJECTIVE: The purpose of this study was to compare the effects of a water + electrolyte solution versus plain water on changes in drinking behaviors, hydration status, and body temperatures during wildfire suppression. METHODS: Eight participants consumed plain water, and eight participants consumed water plus an electrolyte additive during 15 hours of wildfire suppression. Participants [...]