Table 4

 Physiological values in tennis players corresponding to the maximum work load in tennis field (FT) and treadmill (TT) tests (n = 9)

VariableFTTTp Value
*p = 0.058.
Values are mean (SD). Bf, breathing frequency; HR, heart rate; RER, respiratory exchange ratio; VCO2, carbon dioxide production; VE, minute ventilation; VO2, oxygen uptake; Vt, tidal volume.
VO2 (ml/min/kg)63.8 (5.7)58.9 (5.3)<0.05
VCO2 (ml/min/kg)74.5 (7.5)58.7 (5.5)<0.001
RER1.18 (0.07)1.03 (0.04)<0.001
VE (l/min)117.1 (17.4)115.1 (14.5)NS
HR (bpm)190.0 (5.2)194.1 (7.7)NS
Bf (breaths/min)62.5 (8.7)67.4 (11.4)NS
Vt (l)2.24 (0.6)2.07 (0.5)NS*