Errors in the estimation of hydration status from changes in body mass

摘要: Hydration status is not easily measured, but acute changes in hydration are often estimated from body mass change. Changes also used as a proxy measure for sweat losses. There are, however, several sources of error that may give rise to misleading results, and our aim this paper quantify these potential errors. Respiratory water losses can be substantial during hard work dry environments. Mass loss results substrate oxidation, generates oxidation which added the pool, thus dissociating status: fat actually net gain carbon dioxide generated less than oxygen consumed. Water stored with muscle glycogen presumed made available endogenous carbohydrate stores oxidized. Fluid ingestion complicate picture by altering distribution. Loss hypotonic increased osmolality fluids. Urine faecal measured easily, content bladder gastrointestinal tract cannot. Body change always reliable occur without an effective negative fluid balance.