Chapter 17. Environment and Exercise. Key Concepts. altitude acclimatization conduction convection core temperature evaporation frostbite heat exhaustion . heat strain heat stress heat stroke hypothermia radiation temperature regulatory center wind chill factor . Review Questions.
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Environment and Exercise
It is accomplished through physical contact
between one substance and another (e.g., the
body loses heat through conduction when
submerged in cold water).
Heat is transferred by a moving fluid-
liquid or gas (e.g., man submerged in
Heat is transferred by means of electromagnetic
waves (e.g., sun heating the earth)
When a liquid changes to a gas, it
requires large amounts of heat energy
(e.g., a refrigerator or a human leaving
the swimming pool)
The regulatory function is brought about by
nervous feedback operating through the
temperature regulatory center in the
Preventing sudden changes in temperature (chilling)
Protecting the torso, for example with a down-
filled vest, helps maintain core body temperature.
It requires a dramatic increase over resting
metabolism in order for the body to maintain
When environmental temperature approaches
skin temperature, heat loss through convection
and radiation gradually ends, so that the only
means for heat loss is evaporation of sweat.
Radiation and convection reverse their direction
and add heat to the body.
The problems of increased cardiovascular loads
and dehydration are aggravated in a hot, humid
environment because of the body’s decreased
ability to unload water vapor into an already
loaded ambient atmosphere.
Environmental Physiology Lab power when exercising at high altitudes?
Temperature and Performance
Nutrition and the Athlete: Fluid Replacements
The High Altitude Medicine Group
OA Guide to High Altitude: Acclimatization and Illness