Increasing epidemiological evidences have indicated significant relationship between inflammatory markers, most commonly CRP and IL-6, and various HRV indices in CHD patients [12], [13], type I diabetes [22], and in apparently normal adults [9], [11].However, until now, the association between inflammatory markers and HRV in workers exposed to different levels of PAHs has been less clear. Here, CRP is linked to type 1 diabetes mellitus.