chapter 17 Flashcards
gaining heat
eating
enviorment
factors leading to heat loss
conduction convection radiation evaporation
temp regulatory center
in the hypothalmus
recptors
temp to hifh incereases rate of heat loss
to low produces metabolic heat
frostbite
crystllization of the fluids in the skin
cold acclimatiozation
increases BMR
decreases Periphreal circulation
increasesd body fat
heat loss
sweatin gis the only means of heat loss
hot and dry
Cooling is brought about by sweat
Slow-moving blood in/close to the skin helps transfer heat to evaporative surfaces and enhances cooling
Exercise can impose severe loads on cardiovascular system
Dehydration is possible
Hot and Humid
Hot and humid:
Evaporative cooling is impaired
Metabolic heat accumulates and raises body temperature
Problems of exercising in a hot, dry environment are aggravated
human limitations on heat
Heat stress
Sum of the metabolic and environmental heat loads
Heat strain
Bodily effect of heat stress
Muscle (heat) cramps
Acute, painful, involuntary muscle contraction due to dehydration, electrolyte imbalance, neuromuscular fatigue
Heat syncope
Dizziness associated with high environmental temperatures
Exertional hyperthermia
Core temperature greater than 104 degrees F during physical activity
Exertional heat exhaustion
Fatigue due to the rate of heat loss cannot keep up with heat production of the body during heat
Exertional heatstroke
Potential fatal disorder via core temperature greater than 104 degrees F; loss of consciousness follow exertion.
children and old people less tolerance for the heat
females
hot and humid
males
hot and dry
