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Fig. 1. Variables associated with fictive breathing recorded from the in
vitro brainstemspinal cord preparation at pH levels ranging from
7.4 to 8.2. (A) Fictive breath frequency; (B) episodes per minute; (C) breaths
per episode; (D) integrated vagal activity; (E) fictive breath duration. The
data are reported as the mean ± 1 s.e.m. *Significant difference from
the value at pH 8.2;
significant difference between the
control and chronically hypercapnic groups. The solid bold line through the
data in A is a first order regression line (control,
r2=0.83; chronic hypercapnia,
r2=0.96). The dotted lines are 95% confidence
intervals.