Fig. 1.
A: plasma glycerol concentration (μM) at rest and during exercise before and after 12 wk of endurance training. The pretraining (PRE) trial was at 65% peak O2 uptake (V̇o2peak). The absolute workload posttraining (ABT) trial was at the same absolute exercise power output that elicited 65% V̇o2peak before training, and the relative (RLT) exercise task elicited 65% of the posttraining V̇o2peak. B: free fatty acid (FFA) concentrations (μM) over time in middle-aged (55 ± 0.6 yr) postmenopausal women at rest and during exercise before and after 12 wk of endurance training. C: molar percent excess (MPE) of D5-glycerol over time for the 3 isotope trials. D: MPE of [1-13C]palmitate over time for the 3 isotope trials. Values are means ± SE. *Significantly different from pretraining 65% (PRE) at P < 0.05.