Interval Training Has No Effect on Fat Oxidation

Interval training causes substantial increases in fitness and physiological capacity. Recreationally active people improved aerobic and exercise capacity by 15 to 20 percent, glycogen storage by 28 percent and mitochondrial enzyme levels by 38 percent in only a few weeks of training. Many people exercise to control body composition, but the effects of interval training on weight control are not clear. Danish researchers found that six weeks of high-intensity interval training (HIIT) increased maximal oxygen consumption substantially, but had no effect on fat metabolism in fat cells. HIIT increased mitochondria (cell powerhouses) in skeletal muscle but not in fat cells. HIIT is a terrific way to build aerobic capacity rapidly, but should be complemented by traditional aerobic training for optimal fat loss. (Scandinavian Journal Medicine Science Sports, 25: e59-e69, 2015)

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