(A) Comparison of the expression levels of Had1 and Acox3mRNA in w1118, Hand > w1118, and Hand > mtpRNAi hearts under different treatments using one-way ANOVA with LSD for post hoc testing. Compared to the NFD groups, Had1 expression was decreased in HFD + w1118 and HFD + Hand > w1118 Drosophila cardiomyocytes, while Acox3 expression was decreased in HFD + w1118, HFD + Hand > w1118 and HFD + Hand > mtpRNAi Drosophila cardiomyocytes. Compared with the HFD groups, there was a general increase in Had1 and Acox3 in w1118, Hand > w1118, and Hand > mtpRNAi Drosophila cardiomyocytes after exercise training. All samples were virgin flies of 10 days (N = 50 per group). (B) Putative role of mtp in β-oxidation in the heart stimulated by exercise training.