As you become dehydrated, your body's core temperature increases. This adversely affects your cardiovascular function and reduces your capacity for physical work. Even a small decrease in your body's hydration level can decrease your performance. Studies have shown that even mild dehydration of 3% of body weight can decrease contractile strength by 10%. When 4% - 5% or more of total weight is lost in water, muscular and aerobic endurance can decrease by 20% to 30%. If more than 1012% of the body's weight as water is lost, you could die.
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