| CPET | cardiopulmonary exercise test |
| HTR | heart transplant recipients |
| HRR | heart rate response |
| CI | chronotropic incompetence |
| APMHR | age-predicted maximum heart rate |
| OHT | orthotopic heart transplantation |
| MVV | maximum voluntary ventilation |
| PETCO2 | peak end-tidal carbon dioxide |
| RER | respiratory exchange ratio |
| VCO2 | carbon dioxide production |
| VE | minute ventilation |
| VO2 | oxygen consumption |
| VT | ventilatory threshold |
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