Summary of the characteristic DC-potential parameters analyzed for the various experimental conditions.

The averaged absolute DC potential parameters of all control HSDs recorded are summarized in the first line. The second line shows the absolute DC potential parameters of those slices undergoing repeated hypoxia. All corresponding parameters determined upon drug treatment or repeated hypoxia were normalized to the respective control HSD recorded previously in each slice. Only these normalized parameters are shown to highlight the effects of a particular treatment. Asterisks indicate significantly different changes of the normalized data as compared by one-sample t-tests to unity (* P