To me 5 hours in the sun just walking is like 12 hours of working construction indoors. What causes this effect?
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During heat, your veins expand. Having bigger veins allows more blood to carry heat to the skin so it can be evaporated or radiated away.
However, expanded veins also means more blood volume drops is allowed to drop to the extremities thanks to gravity and the heart has to work harder to pump blood.
Feelings of tiredness can also be caused by losing too much water OR electrolytes from sweating. Water has been discussed, but electrolytes like sodium, potassium and chloride are key to regulating the chemical signalling of your body. When those electrolytes drop and are not replenished it can cause many side effects from tiredness all the way to confusion and even less of consciousness.
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