Increased plasma volume with heat acclimation leads to
increased cardiac output and skin blood flow
When sweat glands become more sensitive to aldosterone after acclimation, they
reduce sweat's sodium content
Frostbite should be rewarmed
preferably in a hospital
During exercise in the cold, muscle
contractile force decreases
Whose body morphology will lead to the most heat loss at a given cold temperature?
slender child
Exercise-induced asthma in the cold affects as many as
50% of winter athletes
Which of these is a response to a single bout of exercise in the heat?
increased vasodilation of skin arterioles
Heat cramps must be treated with
rapid sodium replenishment
Women sweat less than men at the same relative exercise intensity because
they produce less sweat per sweat gland
Excessive _________ losses are most closely associated with heat cramps.
Sodium
If core temperature is not excessively high but an athlete is still exhibiting dizziness, nausea or vomiting, and a rapid, weak pulse, he or she mostly likely has
Heat exhaustion
Heat that the body gains from the sun on a cloudless day is categorized
Radiation
In the heat, clothing functions as all of these EXCEPT
Source of radiation
Heat that the body gains from sitting on hot turf is categorized as
Conduction
Of the four major variables of heat transfer, which one is most important for daily living?
Convection
Which of these is NOT an effector controlled by the POAH?
apocrine sweat glands
Which of the following variables is most important in determining whether hot environmental conditions are safe for competition?
wet-bulb temperature
Which of the following equations represents total heat gain by the body?
M - W � R � C � K - E > 0
Cheyne-Stokes breathing manifests as
irregular nocturnal ventilation
The major factor that drives the acute altitude-associated decrease in VO2max is
inadequate alveolar PO2
Which of the following would be the most appropriate treatment for HACE?
supplemental O2
Which of these hormones does NOT contribute to increased metabolism during acute altitude exposure?
Erythropoietin
Extreme pulmonary vasoconstriction due to hypoxia may lead to
HAPE
Increased pulmonary ventilation during acute exposure to altitude is stimulated by
Chemoreceptors
Dehydration can happen quickly at altitude as the result of all of the following EXCEPT
High radiation
Altitude-induced hyperventilation leads to respiratory acidosis.
False
PO2 = ___________.
Pb x 0.2093
Weight loss that occurs at high altitude is due to
All of these
The partial pressure of oxygen is proportional to
barometric pressure
At altitude, the oxyhemoglobin dissociation curve shifts to the right.
False
Altitude-induced hyperventilation leads to respiratory acidosis.
False
The environment in which athletic performance declines significantly for a large percentage of people, even after acclimation, is
high altitude
At altitude, ______________ is the body's preferred fuel both at rest and during exercise.
carbohydrate
The decreased PO2 gradient between blood and muscle significantly limits exercise capacity at altitude.
True
Dehydration happens faster (and more severely) at altitude.
True
PO2 at sea level is
159 mmHg