| CR | Cardiac Rehabilitation |
| CRU | Cardiac Rehabilitation Units |
| CRP | Cardiac Rehabilitation Program |
| CRS | Cardiac Rehabilitation Sessions |
| ECG | Electrocardiogram |
| VT1 | First Ventilatory Threshold |
| VT2 | Second Ventilatory Threshold |
| HR | Heart Rate |
| bpm | Number of contractions of the heart per minute |
| OHRTZ | Optimal Heart Rate Training Zone |
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