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ISO alters the HR and HRV effects of a 4 h nose-only PM inhalation. Data represents each group's mean change (± standard error) at the 7 h immediately after exposure relative to its own values on the preceding day at the same time. During both monitoring periods, animals resided in home cages. Star indicates significant difference from Sal-PM (P < 0.05). Diamond represents significant difference from ISO-Air (P < 0.05). N = 5 per group.
