Cardiopulmonary Exercise Testing - Ellis Flashcards
What do the following acronyms stand for?
VO2
MVO2
RQ
RER
VO2- oxygen consumption
MVO2- maximum oxygen consumption
RQ-respiratory quotient (CO2 produced: O2 consumed)
RER-respiratory exchange ratio (RQ at atomspheric level)
What is the main challenge in exercising?
Maintain oxygen to generate ATP
How does the heart respond to exercise?
Increases contractility
Increases heart rate
How do the lungs respond to exercise?
Increase alveolar ventilation
slides say 20x…. not sure if that’s important
How does the circulatory system respond to exercise?
vasodilates the pulmonary artery
vasodilates systemic circulation
What is produced in anaerobic exercise? How does the body handle it?
Lactic acid
buffers it with bicarb
What is the anaerobic threshold?
You’d THINK it’s the point where anerobic metabolism starts, but (counterintuitively) that’s actually aerobic threshold.
Anaerobic threshold is reached at 60% of the maximum respiration and basically starts accumulating lactic acid at a faster rate.
How are the anaerobic and aerobic thresholds determined?
blood samples are taken during exercise and plotted on a graph
Two different slopes should appear and the points where the slopes change marks the thresholds.
What is a cardiopulmonary exercise test?
What might it be used for?
A test that evaluates lungs, heart, and muscles of a patient while they are exercising
Used to determine cause of symptoms, utility of a transplant, etc.
