Fig. 2From: The influence of inhaled multi-walled carbon nanotubes on the autonomic nervous systemBar graph depicting % change of RMSSD from the basal level before exposure (Control vs MWCNTs: 4.11 ± 0.39 vs 3.94 ± 0.30 ms). Each value represents the mean ± SE of 8 rats. P < 0.01 compared with control group (*)Back to article page