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PM inhalation increased tidal volume, expiratory time, and relaxation time only in ISO-pretreated animals. Values represent group means (± standard error) immediately after nose-only inhalation exposure (“Post-Inhal”) or the time-matched period on the preceding day (“Pre-Inhal”) after a 2-h acclimation to nose-only restraint. Star indicates significant difference between values indicated by bracket (P < 0.05). N = 5 per group.
