Enzyme activities that served as markers for the respective metabolic pathways, were chosen as follows: creatine kinase (CK; EC 2.7.3.2) for rapid ATP replenishment capacity, phosphorylase (PHOS; EC 2.4.1.1) for glycogen breakdown capacity, phosphofructokinase-1 (PFK; EC 2.7.1.11) for flux capacity of glycolysis, lactate dehydrogenase (LDH; EC 1.1.1.27) for lactate production, citrate synthase (CS; 2.3.3.1) for Krebs cycle oxidative capacity and 3-hydroxyacetyl Co A dehydrogenase (3HAD; EC 1.1.1.35) for fat oxidation capacity. Enzyme activities were determined spectrophotometrically at 25 °C using methods described by