A 50-year-old man with a resting cardiac output of 5 L/min exercises maximally, increasing cardiac output to 10 L/min. What is the cardiac reserve?
A)10%
B)20%
C)50%
D)100%
E)200%

Question

Quizplus · Accepted Answer

Cardiac reserve is the difference between the maximum cardiac output a person can achieve during peak exercise and their resting cardiac output. In this case, the increase from 5 L/min (resting) to 10 L/min (maximum) represents a 100% increase, or doubling, of the cardiac output.

A 50-Year-Old Man with a Resting Cardiac Output of 5