There was a negative correlation between serum NO (r = –0.73; p < 0.005) and serum irisin levels (r = –0.52; p < 0.005) of the groups, and positive correlations between the serum and tissue NO levels (r = 0.64; p < 0.005) and myocardial infarct markers [CK (r = 0.49; p < 0.005), CKMB (r = 0.56; p < 0.005) and troponin I (r = 0.66; p < 0.005)]. Here, FNDC5 is linked to myocardial infarction.