**Figure 4.** Association between maximal fat oxidation (MFO) (**A, B**), and the intensity of exercise that elicits MFO (Fat_{max}) (**C**) with age. I� (unstandardized regression coefficient), R^{2} and P are from a simple linear regression analysis. Abbreviations: MFO; Maximal Fat Oxidation, MFO_{LM}; Maximal Fat Oxidation relative to lean mass, Fat_{max}; Intensity of exercise that elicits MFO, VO_{2}max; Maximal Oxygen Uptake.