Table 4.

Rating of perceived exertion during exercise at 50 and 80%V˙o 2max 1, 3, and 6 h after caffeine or placebo ingestion

Time1 h3 h6 h
CaffeinePlaceboCaffeinePlaceboCaffeinePlacebo
Nonusers (n = 8)
 5 min 50%V˙o 2max 9.6 ± 1.38.8 ± 1.39.1 ± 1.69.1 ± 1.69.0 ± 1.38.8 ± 1.8
 5 min 80%V˙o 2max 12.3 ± 1.012.1 ± 0.813.1 ± 1.713.4 ± 1.512.5 ± 1.213.1 ± 1.0
 10 min 80%V˙o 2max 13.9 ± 1.34-150 14.6 ± 0.514.7 ± 1.74-150 15.1 ± 1.014.8 ± 1.24-150 15.2 ± 1.4
 15 min 80%V˙o 2max 15.4 ± 1.34-150 16.8 ± 0.815.9 ± 1.64-150 17.1 ± 1.216.3 ± 1.14-150 16.9 ± 1.4
 Exhaustion 80%V˙o 2max 18.3 ± 1.618.6 ± 1.119.3 ± 0.618.5 ± 1.218.8 ± 1.018.4 ± 1.3
Users (n = 13)
 5 min 50%V˙o 2max 8.2 ± 1.18.4 ± 1.28.1 ± 1.38.8 ± 1.78.6 ± 1.28.0 ± 1.3
 5 min 80%V˙o 2max 12.2 ± 1.44-150 13.0 ± 1.412.2 ± 1.64-150 13.2 ± 1.712.8 ± 1.44-150 13.3 ± 1.4
 10 min 80%V˙o 2max 14.5 ± 1.24-150 15.4 ± 2.114.7 ± 1.74-150 15.2 ± 1.815.0 ± 1.94-150 15.5 ± 1.5
 15 min 80%V˙o 2max 16.2 ± 1.44-150 17.0 ± 2.016.2 ± 2.34-150 17.0 ± 2.016.7 ± 1.94-150 17.4 ± 1.8
 Exhaustion 80%V˙o 2max 18.3 ± 1.418.6 ± 1.018.8 ± 1.518.6 ± 0.918.7 ± 1.318.7 ± 1.5
  • Values are means ± SD.

  • F4-150 Caffeine at 80%V˙o 2max < placebo at 80%V˙o 2max.