Physiological values in tennis players corresponding to the ventilatory threshold (VT) in tennis field (FT) and treadmill (TT) tests (n = 9)
| Variable | FT | TT | p Value |
|---|---|---|---|
| Values are mean (SD). Bf, breathing frequency; HR, heart rate; HRmax, maximal heart rate; RER, respiratory exchange ratio; VCO2, carbon dioxide production; VE, minute ventilation; VO2, oxygen uptake; VO2max, maximal oxygen uptake; Vt, tidal volume. | |||
| VO2 (ml/min/kg) | 44.2 (5.5) | 43.4 (5.8) | NS |
| VCO2 (ml/min/kg) | 42.8 (6.3) | 38.6 (4.9) | <0.05 |
| RER | 0.96 (0.04) | 0.89 (0.02) | <0.001 |
| VE (l/min) | 58.0 (10.9) | 64.2 (8.4) | NS |
| HR (bpm) | 158.8 (9.3) | 161.1 (9.2) | NS |
| Bf (breaths/min) | 38.1 (10.2) | 40.5 (9.0) | NS |
| Vt (l) | 1.62 (0.56) | 1.74 (0.52) | NS |
| %VO2max | 69.4 (8.1) | 73.5 (6.1) | NS |
| %HRmax | 83.6 (5.1) | 83.0 (2.8) | NS |