Table 1 Physical characteristics and physiological responses to the incremental treadmill test in tennis players. Data are means (±SD).
Age
(years)		 Height
(m)		 Body Mass
(kg)		 PTS
(km·h-1)		 VO2max
(mL·kg-1·min-1)		 HRmax
(beats·min-1)
Males 16.4 (1.8) 1.74 (.06)* 68.9 (5.6)* 17.9 (1.3)* 66.3 (6.9)* 202 (2) *
Females 16.3 (2.2) 1.71 (.03) 65.0 (5.8) 15.1 (.9) 53.0 (.7) 191 (4)
All 16.4 (1.8) 1.75 (.07) 68.8 (8.0) 16.7 (1.7) 59.3 (8.1) 196 (7)
PTS: peak treadmill speed; VO: Maximum oxygen uptake; HR: Maximum heart rate.* Significant differences between genders.