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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.