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16 Cards in this Set
- Front
- Back
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radiation
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heat loss in form of infrared rays
heat from surface of one object to the surface of another with no physical contact being involved summer time body heat not as warm as heat |
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conduction
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transfer of heat from body into molecules of cooler objects in contact with its surface
small amounts (in general) (sitting in cold chair) |
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convection
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form of conductive heat loss in which heat is transmitted to either air or water molecules in contact with body
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evaporation
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accounts for 25% of heat loss at rest
heat transferred from the body to water on the surface of the skin when water gains sufficient heat it is converted into gas taking the heat away from the body |
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heat exchange during exercise:
evaporate |
primary avenue for heat loss during exercise
vapor pressure on skin must be greater than vapor pressure in air 1.temp and relative humidity 2. connective currents around body 3. amount of skin surface exposed to environment |
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heat exchange during exercise:
conductive |
least important means of disappating heat
limited contact |
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heat exchange during exercise:
radiative |
?
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body's response to heat stress
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heat load
core thermal receptors skin integration- hypothalmus effectors cutaneous vasodialation or sweating |
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body response to cold stress
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cold
receptors skin or core integrator both to hypothalmus effectors shivering cutaneous vasoconstriction catecholamine release thyroxin release |
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effect of ambient temperature and core body temp during exercise:
how is core temp and sweat rate effected by heat and humidity |
it increases
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effect of ambient temperature and core body temp during exercise:
how does temperature affect the methods of heat loss? |
?
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effect of heat acclimatization:
increased plasma volume |
10-12% increase due to increa in plasma proteins
maintains central blood volume, stroke volume, and sweating capacity and allows body to store more heat with smaller temp gain |
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effect of heat acclimatization:
earlier onset of sweating |
means sweating begins rapidly after commencement of exercise which translates into less heat storage at beginning of exercise and lower core temp
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effect of heat acclimatization:
increased sweat rate |
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effect of heat acclimatization:
reduced sodium chloride loss in sweat |
due to increase in secretion of aldosterone
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effect of heat acclimatization:
reduced skin blood flow |
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