COX4I1 and metabolic syndrome: The present study shows that acute exercise performed in a cyclergometer by metabolic syndrome patients at 60%–70% of their maximal heart rate for about 30 min does not influence the levels of mitochondrial proteins related with antioxidant (UCP3, MnSOD), respiratory (CoxIV) or mitochondrial remodeling (Mfn1, Mfn2) functions.