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493 Exam 2 - Ch 12
Terms in this set (46)
Which of these occurs during cardiovascular drift?
upward drift in heart rate
Frostbitten tissue should immediately be rewarmed as quickly as possible.
During exercise in the cold, the primary metabolic substrate is
glucose/glycogen in spite of increased circulating catecholamines
Heat cramps must be treated with
rapid sodium replenishment
Sweating and skin vasodilation are the body's only physiological heat loss mechanisms.
Fluid intake should be restricted during training to help the body adapt to dehydrated conditions.
Exercise-induced asthma in the cold affects as many as
50% of winter athletes
Endurance training causes sweat glands to
decrease electrolyte content of sweat secretion
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
When C, K, E, and R are considered together, heat transfer occurs
4 times faster in water than in air
Excessive _________ losses are most closely associated with heat cramps.
When athletes train in the heat, they are undergoing acclimatization.
The primary source of heat loss during exercise in the heat is
The ultimate goal of heat acclimation is to reduce core temperature during exercise.
Which of these is NOT an effector controlled by the POAH?
apocrine sweat glands
The main cause of exercise-induced asthma is
b and c
During exercise in the cold, muscle
contractile force decreases
As windchill becomes greater, ___________________.
convective heat loss increases
For thermoregulatory purposes, the body can be divided into two major compartments: the superficial shell and the deep core.
Acclimation is best achieved through
exercising at low-to-moderate intensity in the heat for 1 h/day for 9 to 14 days
Which of these hormones does NOT help control fluid balance during exercise?
During exercise in the heat, the body's primary means of heat loss is
Body composition and size have a significant impact on heat loss in the cold.
The critical temperature theory suggests that
exercise is shut down when a given core temperature is reached
As air temperature reaches skin temperature, convection becomes an avenue of heat gain.
When sweat glands become more sensitive to aldosterone after acclimation, they
reduce sweat's sodium content
When an athlete is exercising in hot and humid weather
core temperature will increase faster
Women sweat less than men at the same relative exercise intensity because
they produce less sweat per sweat gland
Increased plasma volume with heat acclimation leads to
increased cardiac output and skin blood flow
Swimming in 12 °C water is more dangerous than running in 12 °C air.
A good way to minimize the chance of hyperthermia is to
schedule early-morning and evening practices
Of the four major variables of heat transfer, which one is most important for daily living?
_______________ is most effectively treated using whole-body immersion in an ice bath.
Whose body morphology will lead to the most heat loss at a given cold temperature?
In the heat, clothing functions as all of these EXCEPT
source of radiation
Frostbite should be rewarmed
preferably in a hospital
Which of these is a response to a single bout of exercise in the heat?
increased vasodilation of skin arterioles
Although the majority of ATP breakdown contributes to cellular work, approximately 25% of it contributes to metabolic heat production.
The ability of the hypothalamus to regulate body temperature is compromised when core temperature falls below
34.5 °C (94.1 °F)
If muscle glycogen and blood glucose both start to run low during exercise in the cold, what is the consequence?
suppression of shivering
Which of the following equations represents total heat gain by the body?
M - W ± R ± C ± K - E > 0
Higher circulating catecholamines during cold exposure contribute to higher FFA oxidation.
Heat that the body gains from the sun on a cloudless day is categorized as
Sweat glands functionally resemble which organ in the body?
Heat that the body gains from sitting on hot turf is categorized as
Which of the following variables is most important in determining whether hot environmental conditions are safe for competition?
wet bulb temperature
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