Fig. 1
Hypoxic ventilatory response in non-smokers and smokers. Individual (small symbols) and mean ± S.E.M. (big symbols) values of the isocapnic hypoxic ventilatory response (HVR) of non-smokers and 12-h-abstinent smokers. HVR values represent ventilatory increases (l min−1) per 1% decrease in O2-saturation and are individually normalized for, i.e. divided by, body mass index (BMI). The difference between smokers and non-smokers was highly significant (Student’s t-test, unpaired)