Finally, in HD patients, C-reactive protein correlated with a number of parameters in ETT, namely, HRR at 1st (r = -0.381, P = 0.017) and 2nd minutes (r = -0.382, P = 0.016), resting HR/HRR index (r = 0.355, P = 0.027), SDNN exercise (r = -0.351, P = 0.033) and the AD score (r = 0.318, P = 0.046). The gene discussed is CRP; the disease is Huntington disease.