Sweat

• The major variable in water balance is sweat
• Most sweat is "insensible" and unmeasurable.
• Sweating increases with activity, winter or summer.
• Sweating increases with ambient temperature.
• The most intense sweating occurs
  • with intense physical labor
    • (not often seen in pilots)
  • in hot conditions
• Sweat rates: 50 to 1600 ml/hr
• Sodium content (blood is .9%)
  • .3% if unacclimatized
  • .03% if acclimatized (takes 3 - 5 days)
    • Acclimatization is lost in 2 days...

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