The researchers observed that because there is a reduced utilization of fat in the first 20 minutes of exercise, exercise duration beyond 20 minutes should be the goal. Most scientists recommend that total calories burned are more important than fat calories because more fat calories are burned when more total calories are burned. It has been hypothesized that mountain bike shock absorbers reduce the energy cost of cycling on rough terrain because the rider is not subjected to the full impact of bumps and vibrations, and the wheels more fully contact the ground, minimizing energy loss. The differences in calories burned between mountain bikes were not significant. The bikes with both rear and front shocks were the most comfortable to ride while the bikes with no shocks were the least comfortable to ride.
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