Exam 3 test questions Flashcards
You are helping at an aid station during an ultramarathon to ensure the athletes are safe. The first runner comes to the aid station after two hours with a body temperature of 39 degrees C and has lost 2 lbs in that time. They seem to have normal responses to questions. Based on this information, do you think they are safe to continue? Why or why not?
The elevation of body temperature by two degrees is normal for a person that is exercising. The two pounds of weight loss would be due to the runner sweating to try and keep cool. It can be possible for an athelete to lose up to 1.5-2L of water per hour, which would be indicative of a 1.5-2 pound loss. I would have the athelete drink some fluids to replenish what has been lost, but be careful not to cause overdrinking. If at the next stop his temperature had increased above 39 getting closer to 40, I would stop the athelete as exercising above a core temperature of 40 C is dangerous.
Bob lives in Death Valley, California. Summertime temperatures are commonly 115° F. One afternoon while jogging on the treadmill in the air-conditioned comfort of the local gym, he decides that he feels cooped-up, hops off of the treadmill and goes outside to continue his run. Assuming he keeps up the same pace as in the gym, what would you expect to occur to the following variables as he begins to exercise in the heat?:
Sweat rate Heart rate Stroke volume Blood flow to muscles Blood flow to the skin
Increase:
Blood flow to the skin
Sweat rate
Heart rate
Decrease:
Stroke volume
Blood flow to muscles
Stay the Same:
N/A
Exposure to an altitude of 8,000 ft would cause what to decrease? (select all that apply)
A: partial pressure of oxygen
B: % atmospheric oxygen
C: resting cardiac output
D: resting respiratory rate
A: partial pressure of oxygen
What is HiLo training? What are the potential benefits of HiLo training? What are some potential limitations to HiLo training?
Graded
HiLo training is when an athelete lives at altitude but trains at a lower level. The benefits to this are the acclimation to the altitude, which includes an increased plasma volume and therefore a higher hematocrit and hemoglobin level. The benefit to training at lower altitude is that your body can actually train at the intensity necessary to have the cardiovascular responses to training with exercise. This would be an increase in VO2 max that is observed with higher intensity training that cannot be acheived at higher altitudes.
Some limitations to HiLo training is the possibility of living in an area where it is possible. Additionally, it takes two weeks to become acclimated to the higher altitude to see any increase in hematocrit levels and you lose these adaptations within two weeks after leaving the altitude.
During acute aerobc exercise, which of the following is NOT increased? A: SV B: HR C: plasma V D: Respiratory rate
C: plasma V
Which of the following are risk factors for heart disease? (select all that apply)
A: high cholesterol
B: love of chocolate ice cream
C: sedentary lifestyle
D: obesity
A: high cholesterol
C: sedentary lifestyle
D: obesity
Do each of the following increase, decrease, or stay the same as a result of exercise training?
Plasma V Resting SV Max SV Resting HR Submax HR Max HR Max Q Max Systolic P
Increase: Max SV Resting SV Plasma V Max Q
Decrease:
Resting HR
Submax HR
Stays the same:
Max HR
Max systolic Pressure
During maximal exercise what happens to the a-vO2 difference?
decreased venous content due to more unloading in the capillaries
What are the limitations of using steps/day as an indicator of exercise volume and intensity?
The limitations is that you could get 7,000 steps per day but never actually meet a moderate to vigorous intensity, and therefore would not get any benefit of doing so. Taking 7,000 steps would probably fulfill the volume requirement for active minutes, the only issue is that the minutes may not be active if it is just a lesiurley stroll through the mall. An increase in heart rate that meats the training zone would be necessary.
Which is true of exercise with acute altitude exposure compared to ambient conditions? (select all that apply)
A: Higher submax RR
B: Higher plasma V
C: Higher submax HR
D: Higher VO2 max
A: higher submax RR
C: higher submax HR
As intensity increases during aerobic exercise, systolic pressure____, and diastolic pressure_____.
increases, stays the same
Which of the following are adaptations to altitude exposure? (select all that apply) A: Increased RBC V B: Increased SV C: Increased plasma V D: Increased body T
A: Increased RBC V
B: Increased SV
C: Increased plasma V
During big muscle activities such as running and cycling at maximum intensity, muscle blood flow accounts for approximately how much of the total cardiac output?
80-85%
Which is true of exercise in a hot, humid environment compared to ambient conditions? (select all that apply) A: Increased sweat production B: Increased max SV C: Increased submax VO2 D:Increased max HR
A: Increased sweat production
C: Increased submax VO2
During exercise, the major increase in blood flow is observed in the __________.
Active skeletal muscles
