Fig. 6From: The influence of inhaled multi-walled carbon nanotubes on the autonomic nervous systemBar graph depicting % change of HF power from the basal level before exposure (Control vs MWCNTs: 1.33 ± 0.30 vs 1.33 ± 0.28 ms2). Each value represents the mean ± SE of 8 rats. P < 0.01 compared with control group (*)Back to article page