Table 2: Exercise characteristics.

	Mean ± SD
VO2max (ml/kg/min)	35.0 ± 10.2
Maximum heart rate (bpm)	167.7 ± 13.7
Maximum percent of age-predicted maximal heart rate (%)	88.4 ± 7.2
Maximum rating of perceived exertion (Borg scale, 6-20)	17.7 ± 1.5