WHAT CAUSES THE STOMACH TO REBEL AGAINST ELEVATED BODY CORE TEMPERATURE?
Hypohydration reduces the GASTRIC EMPTYING RATE of ingested fluids during exercise in the heat [14, 15]. Neufer et al [14], for example, found a reduction of .25% in the gastric emptying rate when their subjects were hypohydrated (-5% body weight) that was related to increased core temperature [10, 13, 14, 15]. Dehydration amounting to about -10% of body weight was induced in adult MALE RATS by exposure to a hot, dry environment (D.B.T., 36 degrees C; R.H., 20%) over 6 to 8 hr. (A 10% fluid loss in humans may result in death.) BODY FLUIDS LOSS ORIGIN PERCENT FLUIDS LOSS MUSCLE 40% SKIN 30% BONE 14% VISCERA* 14% *The G.I. tract had the highest tendency to lose water while the brain and liver showed the least [16]. WHAT ARE THE PREVENTATIVE INTERVENTIONS? To prevent thermal injuries during distance running, the American College of Sports Medicine proposes that between 28-56 fluid ounces water should be ingested each hour during prolonged exercise. YET SUCH HIGH RATES OF FLUID INTAKE (28-
