Effectiveness and Acceptability of Nutrient Solutions in Enhancing Fluid Intake in the Heat

Two colored, flavored, 2.5 carbohydrate-electrolyte solutions Armyade and NBC Nutrient solution with varying level of magnesium, potassium, and phosphorus were tested for ad libitum consumption and acceptability during 8 days of work in a hot environment. Sixty-one male and female soldiers were divided into 4 test groups. A Control group drank water while the remaining three groups were given one of the following test beverages NBC Nutrient solution, Armyade, or a colored flavored water placebo. All four groups were allowed to consume other fluids such as plain water, soda, juice, etc. Acceptability in terms of hedonic ratings and consumption rate was determined. There were no group difference in terms of energy intake. Urine specific gravity and electrolytes, body weight, and fluid intake were monitored twice daily to assess hydration status. Drinking NBC and Armyade solutions appeared to be safe under the conditions studied. The ability to measure heat stress levels across a large area would provide valuable information for optimizing soldier performance. The close correlation between field and satellite-derived WBGT readings during the field trial indicates significant potential for the use of satellite remote sensing technology to accurately assess WBGT in training operational environments.