AT	Anaerobic Threshold
a-vO2 diff	Arteriovenous Oxygen Difference
CI	Cardiac Index
CHF	Chronic Heart Failure
CO	Cardiac Output
COPD	Chronic Obstructive Pulmonary Disease
CPO	Cardiac Power Output
GLP-1	Glucagon-like Peptide 1
HF	Heart Failure
HR	Heart Rate
IGR	Inert Gas Rebreathing
LVAD	Left Ventricular Assist Device
PAC	Pulmonary Artery Catheterization
peak VO2	Peak oxygen consumption
PH	Pulmonary Hypertension
PBF	Pulmonary Blood Flow
RQ	Respiratory Quotient
SF6	Sulfur hexafluoride
SV	Stroke Volume
VCO2	Ventilatory Carbon Dioxide Output
VE/VCO2	Ratio of minute ventilation to carbon dioxide output
VO2	Oxygen Consumption
VE	Minute Ventilation
VO2 max	Maximal oxygen consumption