Illinois State University Thermal Regulation and Exercise Chapter 14.

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Presentation transcript:

Illinois State University Thermal Regulation and Exercise Chapter 14

Illinois State University Normal Temperature l 36.1 to 37.8 C (97.0 to F).

Illinois State University Evaporation l Sweat must evaporate to provide cooling. l Sweat that drips off the skin provides little or no cooling.

Illinois State University Humidity l Humidity - water saturation level of the air.

Illinois State University Temperature l Temperature –Aural –Sublingual –Esophageal –Rectal

Illinois State University

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

Illinois State University Temperature Sensors l Peripheral receptors - skin. l Central receptors - core temperature.

Illinois State University Exercise in the heat: l Heat fatigue and heat cramps l Heat exhaustion l Heat stroke

Illinois State University Heat Stress Index

Illinois State University Exercise in the heat l Repeated exposure to heat stress causes a gradual improvement in your ability to lose excess heat. l Acclimatization.

Illinois State University Exercise in the cold l Shivering l Hormonal warming (sympathetic nervous system) l Peripheral vasoconstriction

Illinois State University Exercise in the cold l Surface area and subcutaneous fat. l Wind chill. l Immersion in water.

Illinois State University Wind Chill Index

Illinois State University Exercise in the cold l Hypothermia (34.5 or 94.1). l Frostbite. l Layering.