Fig. 2

Changes of amplitude (A), minute activity (A × f) and frequency of discharge (f) of the phrenic nerve (PHR) (a, b, e) and hypoglossal nerve (HG) (c, d) in normoxia and hypoxia in animals following vehicle (Sham), and 6-OHDA (6-OHDA) injection. Results are expressed as a percentage of the baseline nerve activity before hypoxia. All values are mean ± SEM. N normoxia, R recovery after the hypoxic stimulus. *^#p < 0.05; **^##p < 0.01, *—statistical significance in comparison to normoxic value expressed as 100% (N), #—statistical significance between corresponding points of hypoxic response present in 6-OHDA and Sham groups (n = 7–9 per group)