Final answer:
Increased fat storage in the liver does not contribute to increased fat metabolism during endurance exercise. Improvements in fat metabolism link to increased FFA transporters, beta oxidation enzymes, and blood flow rather than fat storage.
Step-by-step explanation:
The factor that does NOT contribute to endurance exercise training-induced increases in fat metabolism during exercise is increased fat storage in the liver. When endurance is increased through exercise, it typically involves improvements such as an increase in free fatty acid (FFA) transporters, enhancements in beta oxidation enzymes, and improvements in blood flow, all of which facilitate increased fat metabolism. Increased fat storage in the liver, however, does not directly contribute to the enhancement of fat metabolism during exercise; rather, it is a place where excess energy can be stored. Efficient fat metabolism during endurance exercise pertains more to the transport, mobilization, and oxidation of fats within muscle tissue rather than the storage of fats in the liver.