Practice Questions Flashcards
True or False: Exercising a smaller portion of the body leads to a greater hormonal response.
False
What is VO2max a measure of?
d) The maximal rate at which your body can use oxygen
How much work is done when lifting a 20kg box 3m vertically?
588.6J
How many calories are in a kcal?
1000
A sprinter exerts 8000J in 30 seconds. How much power did the sprint require?
266.7W
You climb a set of stairs that is 10m high in 60 seconds. If you weigh 65kg, what is your total work and power?
To be calculated based on weight and height
Explain the difference between direct and indirect calorimetry.
Direct – measure heat produced, Indirect – measure O2 consumption
What is the formula to calculate VO2?
VO2 = ventilation (FiO2 – FeO2)
If a man has a ventilation of 45 L/min and his exhaled breath is 16% O2, what is his VO2?
2.22L O2/min
Assuming the person weighs 60kg, what is his VO2 relative to his mass?
37mL/(kg x min)
If the same person exercises at this rate for 5 minutes, how many calories does he burn?
55.5 kcal
What uses isotopes to determine energy expenditure?
Doubly labeled water
What are the four components that make up total daily energy expenditure?
- Resting energy expenditure
- Thermic effect of feeding
- Non-exercise activity thermogenesis
- Exercise energy expenditure
Which component makes up the largest portion of total daily energy expenditure?
Resting energy expenditure
What is the formula for calculating efficiency in the given context?
E = dP/dVO2
E represents efficiency, dP is the change in power, and dVO2 is the change in oxygen consumption.
What is the efficiency calculated in the example provided?
58%
Efficiency is calculated using the difference in power output and VO2 values.
How does energy expenditure vary with work rate according to the example?
Work rate goes up exponentially with energy expenditure.
Which runner has more training when both are running at 7 mph, Runner A with a VO2 of 30 mL/kg/min or Runner B with a VO2 of 27 mL/kg/min?
Runner B (better efficiency)
A lower VO2 can indicate better efficiency in running.
Does VO2 vary more between trained and untrained athletes in running or in swimming?
Swimming
What happens to mean arterial pressure (MAP) when baroreceptors are deinnervated?
MAP stays the same (although variability/range increases)
Is arterial pressure regulated by positive or negative feedback?
Negative feedback
Which of the following is an endocrine organ? a) Stomach, b) Thyroid, c) Adipose tissue
b) Thyroid
What type of hormone signaling occurs when a cell makes a hormone that triggers the same cell without being secreted?
a) Autocrine
Define homeostasis.
Maintaining a constant internal environment
Define hormesis.
Exposure to a physiological stressor causes adaptation to said stressor
How does physical activity affect survival rate after a heart attack?
More physical activity leads to better survival rates because of heat shock proteins
If you want to burn 500kJ by running on a treadmill, what speed in mph should you set it at, given a weight of 65kg and 30 minutes?
43.5 m/min
This calculation considers VO2 and energy expenditure.
What is the Q10 effect?
For every 10 degree increase in temperature, rate of reactions increase a certain amount
If a reaction absorbs energy, is it exergonic or endergonic?
Endergonic
What ATP generating system contributes most to explosive and brief bouts of exercise like tuck jumps?
ATP-PCr
