Maximum sweat rate is 2L/hr
Marathon sweat rate is 0.3-1.2L/hr
Critical dehydration = 5.5%
Medical emergency = 10%
If dehydration is combined with a hot environment, there is a much greater effect on VO2 max and endurance
Plasma volume decreases which decreases blood volume
This decreases stroke volume so heart rate increases to compensate cardiac output
Can only sustain 65-70% of VO2 max in a hot environment
The conflict between thermoregulation and metabolism means there is a reduced blood flow to skin, which decreases sweating so body temperature increases
Also increased risk of heat illness and exhaustion
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