Figure 6
Cardiorespiratory interaction under hypoxia in the toad Rhinella schneideri. Waterfalls showing the spectra calculated (A) and associated histograms for lung inflation cycles (B) in one representative toad before and after selective autonomic blockade (sotalol + atropine) under hypoxic conditions (FIO2: 0.05). In contrast to Fig. 4, the respiratory-related peak in the heart rate variability was mostly abolished by the sympathetic blockade (sotalol). Muscarinic after β-adrenergic blockade completely abolished the remaining respiratory peak.
