Total FFA oxidation
from respiratory exchange ratio was also elevated after
training at ABT and RLT, with all of the increase attributed
to plasma FFA sources. Pretraining, glycerol Ra was higher
during exercise at 65 than 45% ofV˙ O2peak (6.9 6 0.9 vs. 4.7 6
0.6 μmol·kg21 ·min21) but was not changed by training. In
young women 1) plasma FFA kinetics and oxidation are not
linearly related to exercise intensity before training, 2)
training increases FFA Ra, Rd, and Roxp whether measured at
given absolute or relative exercise intensities, 3) whole body
lipolysis (glycerol Ra) during exercise is not significantly
impacted by training, and 4) training-induced increases in
plasma FFA oxidation are the main contributor to elevated
total FFAoxidation during exercise exertion after training.