Table 3

 Physiological values in tennis players corresponding to the respiratory compensation point (RCP) in tennis field (FT) and treadmill (TT) tests (n = 9)

VariableFTTTp Value
Values are mean (SD). Bf, breathing frequency; HR, heart rate; HRmax, maximal heart rate; RER, respiratory exchange ration; VCO2, carbon dioxide production; VE, minute ventilation; VO2, oxygen uptake; VO2max, maximal oxygen uptake; Vt, tidal volume.
VO2 (ml/min/kg)53.8 (5.5)50.5 (7.6)NS
VCO2 (ml/min/kg)56.0 (7.4)47.9 (7.0)<0.01
RER1.04 (0.04)0.95 (0.04)<0.01
VE (l/min)78.6 (14.0)87.3 (14.5)<0.05
HR (bpm)174.9 (5.4)179.3 (9.3)NS
Bf (breaths/min)43.8 (8.7)53.3 (13.7)<0.01
Vt (l)1.88 (0.63)1.85 (0.56)NS
%VO2max84.4 (6.5)85.5 (8.7)NS
%HRmax92.1 (2.1)92.3 (2.1)NS