Table 1.

Subject characteristics

Nonusers (n = 8)Users (n = 13)P Value
Age, yr29.1 ± 6.434.0 ± 7.70.15
Height, cm173.5 ± 11.7176.1 ± 8.10.55
Body mass, kg70.8 ± 13.377.3 ± 11.90.26
o 2max, l/min3.57 ± 0.83.94 ± 0.90.32
o 2max, ml · kg−1 · min−1 50.7 ± 8.451.2 ± 7.40.90
Maximal heart rate, beats/min* 190 ± 10180 ± 70.007
  • Values are means ± SD.V˙o 2max, maximal oxygen consumption.

  • * Nonusers > users.