Figure 5From: Relationship between oxygen supply and cerebral blood flow assessed by transcranial Doppler and near – infrared spectroscopy in healthy subjects during breath – holdingAverage O 2 Hb and CO 2 Hb concentration changes during BH. O2Hb (left graph) and CO2Hb (right graph) concentrations during BH for the sample population. The superimposed vertical bars represent the standard error. The average graphs were obtained by normalizing the BH phase of each subject.Back to article page