FINAL (Chapters 11-22)
Terms in this set (61)
Which of the following statements explaining the increase in SV after aerobic training is correct?
preload, contractility, and after load decrease
T/F After anaerobic training, the cross-sectional areas of type I, IIa, IIx fibers increase
Which of the following is not true about oxidative enzyme response to aerobic training?
phophorylase and phosphofructokinase activities are particularly high
Why does (a-v) O2 difference increase after aerobic training?
tissue O2 extraction increases
[CHECK] Which of these is a major factor in muscle that limits further increases in VO2 max?
muscle oxidative enzyme activity
Which chamber of the heart adapts most to chronic endurance training?
T/F The changes in muscle function observed after aerobic training are due entirely to increased strength because enzymatic activity
[CHECK] Plasma volume increases during the first two weeks of aerobic training because
plasma protein synthesis increases
T/F After endurance training, stroke volume increases due to changes in preload, contractility, and afterload
Which of the following is not a mechanism of increased stroke volume after endurance training?
increased resting and submaximal heart rate
Which of these external factors plays the biggest role in determining VO2 max?
Anaerobic training leads to
increased glycolytic and ATP-PCr production of ATP
[CHECK] If the intensity of a single bout of aerobic exercise continue to increase, but VO2 max plateaus or decreases slightly, the
lactate threshold has increased
T/F With aerobic training, the lactate threshold moves up to a higher % VO2 max
In response to aerobic training, muscle fiber mitochondria
increase in size and number
High-intensity interval training yields
aerobic fitness equal to that gained by chronic endurance training
T/F At a given sub maximal exercise intensity, HR will be higher after endurance training
T/F Plasma volume decreases after endurance training (due to chronic sweating), but red blood cell production increases
[CHECK] Which of the following changes occurs in maximal blood pressure after aerobic training?
systolic BP increases, diastolic BP decreases
After aerobic training, more existing capillaries are now open in exercising muscle vasculature. This phenomenon is called
After aerobic training, increased capillary formation and capillary recruitment combine to lead to
increased oxidative enzyme activity
T/F Although the majority of ATP breakdown contributes to cellular work, approximately 25% of it contributes to metabolic heat production
T/F Swimming in 12 degrees celsius water is more dangers than running in 12 degrees celsius air
Acclimation is best achieved through
exercising at low-to-moderate intensity in the heat for 1 hr/day for 9 to 14 days
During exercise in the cold, muscle
contractile force decreases
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 is most likely suffering from
T/F As air temperature reaches skin temperature, convection becomes an avenue of heat gain
During exercise in the cold, the primary metabolic substrate is
glucose/glucogen in spite of increased circulating catecholamines
The ability of the hypothalamus to regulate body temperature is compromised when core temperature falls below
34.5 degrees celsius (94.1 degrees F)
Which of the following variables is most important in determining whether hot environmental conditions are safe for competition
all three temperature are equally important
Sweat glands functionally resemble which organ in the body?
Which of these hormones does not help control fluid balance during exercise?
When C, K, E, and R are considered together, heat transfer occurs
four times faster in water than in air
Endurance training causes sweat glands to
decrease electrolyte content of sweat secretion
Which of these is not an effector controlled by the POAH?
apocrine sweat glands
T/F Higher circulation catecholamines during cold exposure contribute to higher FFA oxidation
T/F Sweating and skin vasodilation are the body's only physiological heat loss mechanisms
In the heat, clothing functions as all of these except
source of radiation
Which of these is a response to a single bout of exercise in the heat?
increased vasodilation of skin arterioles
______ is most effectively treated using whole-body immersion in an ice bath
T/F Meteorological heat index and environmental WBGT values provide identical information
Frostbite should be rewarmed
preferably in a hospital
Which of these occurs during cardiovascular drift?
upward drift in heart rate
When an athlete is exercising in hot and humid weather
core temperature will increase faster
T/F When athletes train in the heat, they are undergoing acclimatization
Increased plasma volume with heat acclimation leads to
increased cardiac output and skin blood flow
Heat cramps must be treated with
rapid sodium replenishment
Which of the following equations represents total heat gain by the body?
If muscle glycogen and blood glucose both start to run low during exercise in the cold, what is the consequence?
suppression of shivering
Of the four major heat transfer variables, which one is most important to daily living?
T/F Frostbitten tissue should be rapidly rewarmed as quickly as possible
As windchill becomes greater, ______
convective heat loss increases
The primary source of heat loss during exercise in the heat is
Exercise-induced asthma in the cold affects as many as
50% of winter athletes
Whose body morphology will lead to the most heat loss at a given cold temperature?
Heat that the body gains from sitting on hot turf would be categorized as
When sweat glands become more sensitive to aldosterone after acclimation, they
reduce sweat's sodium content
A good way to minimize the chance of hyperthermia is to
schedule early morning and evening practices
Heat that the body gains from the sun on a cloudless day would be categorized by
T/F The ultimate goal of heat acclimation is to reduce core temperature during exercise
The critical temperature theory suggests that
exercise is shut down when a given core temperature is reached
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