![]() ![]() This is potentially problematic because they were self-guided, so compliance could have been poor. Participants consumed 500 milliliters of still water over the course of 15 minutes, one hour before arriving at the laboratory. They were also asked to avoid strenuous exercise and alcohol in the 24 hours preceding all trials. Participants recorded their diet and exercise during the two days before the first trial and were asked to replicate it before their subsequent visits. Each participant completed a maximum of four experimental trials that included water along with three other test drinks. A large number of participants were needed due to the study design, which tested 13 different beverages. This study recruited 72 recreationally active, healthy male participants between the ages of 18 and 35. This study set out to determine if a beverage hydration index, similar in principle to the glycemic index, could be established. The volume and amount of electrolytes and sugars of ingested fluids affect their absorption and retention, but various beverages have yet to be systematically compared. The aim of this new study was to determine the fluid balance responses to the ingestion of a set amount of commonly consumed beverages ingested in a euhydrated state (a normal fluid balance). The cumulative volume of urine passed over a fixed period of time can be measured as a marker of fluid absorption and retention. Similar to how the glycemic index is intended to define the blood-glucose response to the ingestion of foods compared to a white bread or glucose standard, a beverage hydration index (BHI) could serve to quantify water excretion from the kidneys in response to various beverages compared with still water. This study is the first to develop a method for systematically quantifying values for hydration and fluid balance. A tolerance to the diuretic actions of caffeine develops with regular intake, and the amounts of caffeine found in normal-sized servings of tea, coffee, soda, etc., do not have diuretic effects. Coffee is often thought of as negatively affecting hydration status, but this is based on studies examining the acute effects of high levels (more than 300 mg) of caffeine on individuals who had been deprived of caffeine for a period of days or weeks. It has long been known that the presence of carbohydrates and electrolytes in a drink increase the rate of fluid absorption after drinking. The rehydration process is affected both by the volume of fluid ingested as well as the sodium content. For example, milk has been shown to be more effective than both water and sports drinks for rehydration after strenuous exercise. ![]() Absorption is affected by the amount of fluid ingested, electrolyte and carbohydrate content, and the presence of diuretic agents (substances that promote urine production). Not all beverages are created equal from a hydration standpoint. You’ve likely heard of the glycemic index and the insulin index, but beverages now also have their own index: namely, the new “hydration index.” People usually think about hydration in the context of sports and exercise, so it may be beneficial to know which beverages can best hydrate you when access to fluids (or bathrooms, see Figure 1 for a rough guide to bathroom-guided hydration statuses) is limited.
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