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Inspiratory phrenic burst frequency during quiet breathing (baseline) and during the initial 30 s (Hypoxiainitial) and final minute of respiratory stimulation with hypoxia (Hypoxiaend). Data are presented in control (i.e. uninjured) rats, and rats at 2-, 4-, 8- and 12-week post-C2HS. *, significantly different than 12-week rats.
