<prompt> Answer this question truthfullyWhat does the term capacity mean in relation to exercise?  <response>: <reason> Patients with congestive heart failure CHF have a reduced exercise capacity due to their inability to deliver oxygen to skeletal muscle and other tissues. A heart failure patients peak exercise capacity is strongly correlated to prognosis. Exercise capacity is quantitated using gas analyzers to assess oxygen uptake V02, carbon dioxide production VC02 and minute ventilation . The peak oxygen uptake peak V02 is linearly correlated with cardiac output and skeletal muscle blood flow. Peak V02 is divided by the heart rate, is highly correlated with stroke volume. Finally, the Fick equation uses 02 consumption to measure cardiac output: Cardiac output V02 arteriovenous 02 difference A-V 02 