Fig. 2

Change from BL in LVP and HRV during exposure. Values calculated as mean (± standard error) of each animal’s change from its 4-day BL (5 h/day). For LVP (a-d), Air n = 3 and PEPs n = 4. For HRV (e-h), n = 4/group. Day + 1 marks post-exposure day in ambulatory monitoring cages. ^#P < 0.10 and *P < 0.05 vs. Air. BL means ± SEM for Air and PEPs groups, respectively: LVESP = 121.7 ± 1.4 and 115.7 ± 1.9 mmHg; LVEDP = 3.6 ± 0.5 and 3.2 ± 0.9 mmHg; CtrI = 114.6 ± 0.8 and 114.6 ± 2.0 s^− 1; tau = 6.7 ± 0.1 and 6.8 ± 0.1 ms; heart rate = 333 ± 4 and 332 ± 6 BPM; RMSSD = 3.00 ± 0.34 and 4.68 ± 0.46 ms; SDNN = 8.10 ± 0.40 and 11.74 ± 0.71 ms; and LF/HF = 1.06 ± 0.14 and 1.28 ± 0.15