Thermal Regulation and Exercise

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Thermal Regulation and Exercise

• Chapter 14

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Normal Temperature

• 36.1 to 37.8 C (97.0 to 100.0 F).

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Evaporation

• Sweat must evaporate to provide cooling.
• Sweat that drips off the skin provides little or
  no cooling.

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Humidity

• Humidity - water saturation level of the air.

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Temperature

• Temperature
• Aural
• Sublingual
• Esophageal
• Rectal

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Hypothalamus

• Houses your thermoregulatory center.
• Acts like a thermometer, monitoring your
  temperature and causing heat loss or production
  as needed.

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Temperature Sensors

• Peripheral receptors - skin.
• Central receptors - core temperature.

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Exercise in the heat

• Heat fatigue and heat cramps
• Heat exhaustion
• Heat stroke

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Heat Stress Index
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Exercise in the heat

• Repeated exposure to heat stress causes a gradual
  improvement in your ability to lose excess heat.
• Acclimatization.

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Exercise in the cold

• Shivering
• Hormonal warming (sympathetic nervous system)
• Peripheral vasoconstriction

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Exercise in the cold

• Surface area and subcutaneous fat.
• Wind chill.
• Immersion in water.

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Wind Chill Index
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Exercise in the cold

• Hypothermia (34.5 or 94.1).
• Frostbite.
• Layering.