A first step towards thermoregulation is to remain calm. A panicked person will have an increased heart rate and the urge to move quickly. The reason to avoid this is because heavy activity will cause the body to perspire and lose valuable water. Additionally, sweat will dampen clothing. Wet clothing will speed hypothermia after sunset, when temperatures begin to fall. This is a consideration EVEN IF you are in the middle of the summer season because evening temperatures can rapidly decline. Perspiration dampened clothing can contribute to skin irritation and blisters.
Knowing how to heed your body’s signals regarding thermoregulation is a life-saving skill. If you begin to perspire, loosen and remove outer garments. This will help keep clothing and skin dry. Watch members of your group and encourage them to remove layers also. If you find that the temperatures are very warm, a dampened cloth across your neck is one method that will help you avoid heat exhaustion.
Avoid working at full capacity as this will create a greater need for drinkable water to replace the hydration you have lost. Work at 60% of your capacity – the point just before you break into a sweat. In a survival situation, it is better to learn the art of steady, plodding activity that brings gradual results, rather than racing to finish each task.
Using this method, construct a shelter, make a fire and prepare for nightfall. When the temperatures drop, re-apply the extra clothing that was not needed during the day.
The following video by Spencer Two Dogs discusses Thermoregulation.