Upgrade to remove ads
Terms in this set (46)
Whose body morphology will lead to the most heat loss at a given cold temperature?
-lean, muscular man
As air temperature reaches skin temperature, convection becomes an avenue of heat gain.
A good way to minimize the chance of hyperthermia is to
-restrict fluid intake
-practice in full football gear
-avoid outdoor practice or competition when WBGT is greater than 31 degrees C
-schedule early-morning and evening practices
schedule early-morning and evening practices
Heat cramps must be treated with
-rapid potassium replenishment (e.g., bananas)
-rapid water replenishment
-rapid sodium replenishment
-rapid calcium replenishment
rapid sodium replenishment
Increased plasma volume with heat acclimation leads to
-increased cardiac output and skin blood flow
-higher heart rate
-dangerous Na+ losses
-lower sweat rates
increased cardiac output and skin blood flow
Body composition and size have a significant impact on heat loss in the cold.
Which of the following variables is most important in determining whether hot environmental conditions are safe for competition?
-all three temperatures are equally important
Acclimation is best achieved through
-exercising at low-to-moderate intensity in the heat for 1 h/day for 9 to 14 days
-using metabolic heat from exercising as the primary stimulus for acclimation
-exercising at moderate intensity in the heat for 3 h/day, 2 times/week
-passively resting in a hot, humid environment
exercising at low-to-moderate intensity in the heat for 1 h/day for 9 to 14 days
_______ is most effectively treated using whole-body immersion in an ice bath
When athletes train in the heat, they are undergoing acclimatization.
The primary source of heat loss during exercise in the heat is
Sweat glands functionally resemble which organ in the body?
The ability of the hypothalamus to regulate body temperature is compromised when core temperature falls below
-37 degrees C
-34.5 degrees C
-25 degrees C
-the hypothalamus is not compromised by cold temperatures
34.5 degrees C
Which of these is a response to a single bout of exercise in the heat?
-reduced vasoconstriction in nonessential tissues
-increased vasodilation of skin arterioles
-increased blood volume
-increased stroke volume
increased vasodilation of skin arterioles
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
Excessive _______ losses are most clearly associated with heat cramps.
Fluid intake should be restricted during training to help the body adapt to dehydration conditions.
Which of these hormones does NOT help control fluid balance during exercise?
When sweat glands become more sensitive to aldosterone after acclimation, they
-reduce the volume of sweat that is secreted
-secrete sweat at a lower core temperature
-increase the volume of sweat that is secreted
-reduce sweat's sodium content
reduce sweat's sodium content
As windchill becomes greater, _________
-convective heat loss increases
-conductive heat loss increases
-radiative heat loss increases
-evaporative heat loss increases
convective heat loss increases
Although the majority of ATP breakdown contributes to cellular work, approximately 25% of it contributes to metabolic heat production.
Heat that the body gains from sitting on hot turf is categorized as
During exercise in the cold, muscle
-shortening velocity increases
-contractile force decreases
-fiber recruitment generates more power
-contraction is inhibited only in deep muscle
contractile force decreases
Higher circulating catecholamines during cold exposure contribute to higher FFA oxidation.
Exercise-induced asthma in the cold affects as many as
-10% of winter athletes
-25% of winter athletes
-50% of winter athletes
-70% of winter athletes
50% of winter athletes
For thermoregulatory purposes, the body can be divided into two major compartments: the superficial shell and the deep core
Heat that the body gains from the sun on a cloudless day is categorized as
The critical temperature theory suggests that
-sweating does not begin until a given core temperature is reached
-hypothermia symptoms do not appear until a given core temperature is reached
-skin vasodilation does not occur until a given core temperature is reached
-exercise is shut down when a given core temperature is reached
exercise is shut down when a given core temperature is reached
Which of these occurs during cardiovascular drift?
-upward drift in heart rate
-upward drift in cardiac output
-upward drift in stroke volume
-upward drift in skin vasodilation
upward drift in heart rate
In the heat, clothing functions as all of these EXCEPT
-resistance to dry heat exchange
-source of radiation
-resistance to evaporative heat loss
source of radiation
If muscle glycogen and blood glucose both start to run low during exercise in the cold, what is the consequence?
-suppression of shivering
-enhanced skin vasoconstriction
-rewarming of extremities
uppression of shivering
The main cause of exercise-induced asthma is
-high respiratory rate
-b and c
During exercise in the cold, the primary metabolic substrate is
-free fatty acids due to increased circulating catecholamines
-free fatty acids in spite of increased circulating catecholamines
-glucose/glycogen due to increased circulating catecholamines
-glucose/glycogen in spite of increased circulating catecholamines
glucose/glycogen in spite of increased circulating catecholamines
When C, K, E, and R are considered together, heat transfer occurs
-2 times faster in air than in water
-4 times faster in water than in air
-6 times faster in air than in water
-26 times faster in water than in air
4 times faster in water than in air
Endurance training causes sweat glands to
-decrease electrolyte content of sweat secretion
-delay onset of sweat secretion
-decrease volume of sweat secretion
-increase Na+ excretion through sweat secretion
decrease electrolyte content of sweat secretion
Frostbite should be rewarmed
-preferably in a hospital
-as fast as possible to avoid gangrene
-and then refrozen to confer cold resistance
-by vigorous rubbing to promote blood flow
preferably in a hospital
The ultimate goal of heat acclimation is to reduce core temperature during exercise.
During exercise in the heat, the body's primary means of heat loss is
Which of these is NOT an effector controlled by the POAH?
-apocrine sweat glands
apocrine sweat glands
Swimming in 12 degrees C water is more dangerous than running in 12 degrees C air.
Frostbitten tissue should immediately be rewarmed as quickly as possible.
Sweating and skin vasodilation are the body's only physiological heat loss mechanisms
Of the four major variables in heat transfer, which one is most important for daily living?
Women sweat less than men at the same relative exercise intensity because
-they produce less sweat per sweat gland
-they have fewer sweat glands
-they do not acclimatize to heat as quickly
-their plasma volume is lower
they produce less sweat per sweat gland
Which of the following equations represents total heat gain by the body?
-M - W ± R ± C ± K - E = 0
-M - W ± R ± C ± K - E < 0
-M - W ± R ± C ± K - E > 0
-M - W ± R ± C ± K - E = 0.1Tdb + 0.7Twb + 0.2Tg
M - W ± R ± C ± K - E > 0
When an athlete is exercising in hot and humid weather
-core temperature will increase faster
-evaporation will be enhanced
-convection will be the only usable method of heat transfer
-clothing will help sweat evaporate better
core temperature will increase faster
THIS SET IS OFTEN IN FOLDERS WITH...
EXSC 493: chapter 15
KIN 4385 ch 12 Review Questions
EXSC 493 Chapter 15
YOU MIGHT ALSO LIKE...
493 Exam 2 - Ch 12
Exercise Physiology - Hot & Cold Environ…
Chapter 12: Temperature regulation
Chapter 12: Temperature regulation
OTHER SETS BY THIS CREATOR
phys215 chapter 12
exsc301 exam 3 multiple choice
book questions (8,9,10,11)