Body Water Lost

1 %
Few symptoms or signs of any thirst present; however, there is a marked reduction in VO2 max.

2%
Beginning to feel thirsty; loss of endurance capacity and appetite.

3%
Dry mouth; performance impaired.

4%
Increased effort for exercise, impatience, apathy, vague discomfort, loss of appetite.

5%
Difficulty concentrating, increased pulse and breathing, slowing of pace.

6-7%
Further impairment of temperature regulation, higher pulse and breathing, flushed skin, sleepiness, tingling, stumbling, headache.

8-9%
Dizziness, labored breathing, mental confusion, further weakness.

10%
Muscle spasms, loss of balance, swelling of tongue.

11%
Heat Exhaustion, delirium, stroke, difficulty swallowing; death can occur.