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revised July 26, 2007

Heat and Humidity

Arrow BulletDehydration

  • It is possible to lose fluid so quickly that the normal thirst mechanism is overwhelmed - we just don't 'feel' thirsty.
  • The sources of fluid loss are breathing, sweating, urinating and backpackerdefecating.
  • The rate of loss from each of these will vary according to activity levels, air temperature, humidity and altitude.
  • Exercise, sweating, diarrhea, temperature or altitude can significantly increase the amount of fluid required.
  • The most common cause of increased fluid loss is exercise and sweating.

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Revised: July 26, 2007

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