Heat issues
With regards to the heat, fluids and treatments, you all are partially correct.. however, you are not putting all of the parts together.
A deeper understanding of the physiology is needed.
I have spent the better part of the last 30 some years lecturing on managing body temperature to Search and Rescue Teams, EMT’s, Paramedics and flight Nurses. I flew as a Reserve Flight Medic in the Southwestern US.
The body functions in a very limited temperature range before there is a deviation away from normal function.
If you have a fever.. even if it is only 100 degrees the body begins to sweat, a cooling mechanism, blood vessels dilate to allow more blood flow to help cool the body.
Conversely, if your core temperature drops only a few degrees, blood vessels close, to keep blood localized. We also begin to shiver as a means to produce muscle activity with the intention to generate heat. The window between warm and cold response by the body is very narrow.
With regards to the body, temperature loss or gain can be as much as 200% faster through a wet medium. Think about falling through the ice, the sudden drop of temperature will conduct heat away from the body at an alarming rate so much so it can render an adult unconscious in a few minutes . This is called Hypothermia.
Hypo… meaning loss, lower Thermia meaning cold in this case ….so loss of heat body core heat is Hypothermia.
In high temperature environments you would suffer from Hyperthermia.
Hyper meaning …more than or higher.. Thermia meaning in this case, hot temperature, so Hyperthermia means an increase in temperature to the body core.
Heat Exhaustion, Heat Stroke are the common maladies with elevated body temperatures. In short the body has lost its ability to cool itself by perspiration. Remember the statement … temperature loss or gain can be faster through a wet medium.. well that is what sweating does.. we don't perspire 70 degrees sweat.. we sweat at whatever body temperature we are at. The wet or moist surface of the skin conducts heat away faster so we can cool faster.
If we lose the ability to sweat, we can not shed the heat effectively so external cooling is required to conduct the heat away. So water mist, wet jackets etc help. However care must be taken to make sure that the wet surface does not exceed the normal temperature of the body otherwise it will cause the skin / body to gain in temperature and that would be a bad thing. You will end up spending up the process for Heat Stroke..
Always keep the skin covered, do not expose it to the sun.. Sun Burn will eventually occur . This is a true burn / cooking of the skin. This promotes dehydration and increases the body temperature.
Fluid intake is important to maintain good temperature management… Water or isotonic balanced solutions. Gator Aid.. diluted 50% with water is better than full strength . There are other fluids that will work as well… you just need to make sure that the you do not place to much sodium in the stomach and intestines or it will draw fluid from blood and tissue thereby reducing the effectiveness of the body cooling itself…
So salt tablets, salted water and other high sodium product do not help…
Cover up, drink plenty of fluid, eat normal foods with reasonable amounts of sodium. One note Caffeine is a diuretic.. meaning that it will cause you to lose more fluid than what you take in… So coffee, sodas etc are not good for hot environments.
I hope this helps a little