Effect of naringenin on the cell viability by H/R in H9c2 cardiomyocytes. A) H9c2 cells were treated with various concentration of naringenin for 24 h and MTT assay was used for the estimation of cell viability. B) H9c2 cells were treated with for 12 h with naringenin and then exposed to 6h of hypoxia. The data presented as means±SD from three independent experiments.