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Changes in phrenic burst amplutude (A), burst frequency (B) and minute phrenic activity (C) during each of three hypoxic episodes (i.e. AIH) in vehicle-treated (filled bars, n = 7) and PPADS-treated (open bars, n = 8) rats. Values are means±1 SEM. *Different from baseline, P < 0.005; #different from corresponding vehicle control (i.e. same protocol, AIH or hyperoxia), P < 0.05.
