Sweat rate

Sweat rate is the amount of sweat a person loses in a set time. It is not the same for everyone. Heat, humidity, effort and clothing all change it.

Why it matters: sweat takes water and sodium out of the body. NIOSH notes that heat cramps usually affect workers who sweat a lot during strenuous activity. When sweating lasts for hours, NIOSH advises balanced electrolytes. See the heat acclimatization schedule for new crews, the jobsite hydration plan and the acclimatization entry.