Table 6.
Definitions of significant measurements associated with postoperative morbidity
| Variable | Definition |
|---|---|
| ASA | ASA classification rank, <3 vs ≥3 (dichotomized) |
| HR1 | Average resting heart rate (beats min−1) |
| HR2 | Average unloaded cycling heart rate (beats min−1) |
| HR3 | Heart rate at AT (beats min−1) |
| HR4 | Heart rate at peak oxygen uptake, VO2 (beats min−1) |
| ΔHR1 | The difference in heart rate (HR) between HR3 (HR at the anaerobic threshold) and HR1 (HR at rest) |
| ΔHR2 | The difference in heart rate between HR4 (heart rate at peak oxygen uptake) and HR1 |
| RER1 | Respiratory exchange ratio (VCO2/VO2) at rest |
| AT/IBW | Anaerobic threshold (AT; ml min−1) per ideal body weight (IBW; kg) |
| AT | AT/IBW, <11 vs ≥11 ml min−1 (dichotomized) |
| %AT | Percentage of predicted AT achieved |
| PAT | Percentage of predicted AT achieved, <75% vs ≥75% (dichotomized) |
| PVO2/IBW | Peak oxygen uptake (PVO2; ml min−1) per ideal body weight (kg) |
| %PVO2 | Percentage of predicted peak VO2 achieved |
| PPVO2 | Percentage of peak VO2 achieved; <75% vs ≥75% (dichotomized) |
| VE3 | Minute ventilation at AT |
| ΔHR1+PAT | Multivariate model combining ΔHR1 and PAT |