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Table 1 Respiratory and Metabolic values at rest

From: Low doses of caffeine reduce heart rate during submaximal cycle ergometry

  Placebo 1.5 CAF 3.0 CAF
VE (L·min-1) 13.4 ± 3.1 13.3 ± 2.3 14.2 ± 3.0
Bf (breaths·min-1) 16.2 ± 4.6 14.6 ± 2.4 16.6 ± 3.9
VT (L·breath-1) 0.93 ± 0.26 0.99 ± 0.20 0.95 ± 0.18
VO2(ml·kg-1·min-1) 5.2 ± 0.8 5.6 ± 1.0 5.7 ± 0.8
RER 0.89 ± 0.08 0.86 ± 0.09 0.84 ± 0.09*
  1. Values listed as mean ± SD. VE, ventilation; Bf, breathing frequency; VT, tidal volume; VO2, oxygen consumption; RER, respiratory exchange ratio. PLA, placebo; 1.5 and 3.0 represent dose of caffeine in mg·kg body weight-1. * Significantly different from placebo (p < 0.05).