31 Jul '15, 10pm

An excerpt from Tim Noakes book about hydration.

An excerpt from Tim Noakes book about hydration.

When fluid is lost from the body, either in sweat as a result of exercise or from the gastrointestinal tract in diseases like cholera or typhoid, the concentration of solutes, especially sodium in the blood, rises, causing the blood osmolality to increase. This rise stimulates receptors in a special part of the brain, the hypothalamus, which in turn interact with three other nuclei, which increase secretion of the hormone AVP/ADH (arginine vasopressin, also known as antidiuretic hormone), whose function is to increase water reabsorption by the kidney. In response to the action of AVP/ADH, the kidney reduces the amount of fluid secreted. As a result, urine flow into the bladder is reduced. Nucleus 5 also stimulates the cells in another part of the brain, the cingulate gyrus, which increases thirst. As a result, the desire to drink is increased and water (and sodium through ...

Full article: http://www.runnersworld.com/hydration-dehydration/drink-t...

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