During a bout of high intensity exercise (i.e., 10 minutes at 80% VO2 max), the plasma concentration of hormones that stimulate fatty acid mobilization from adipose tissue increase significantly. The plasma-free fatty acid concentration, however, actually decreases. Why does this occur?
A. Hormones are ineffective in maximal work.
B. Fatty acid supply is depleted.
C. High insulin levels secreted during maximal exercise interfere with fatty acid mobilization.
D. Lactic acid interferes with fatty acid mobilization.
Answer: D
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