biogenyx labs  Now, in a caloric deficit HIIT can sometimes burn more muscle than LISS. This is because HIIT can only use glucose as energy. When your body reaches 50-85% of its maximal intensity, the anaerobic threshold kicks in and the body has to use glucose only. Glucose is simply known as blood sugar, or "carbohydrates" when they enter the body. When a deficit of carbohydrates are present, then the body turns to the amino acids or phosphate creatine to make ATP (energy). On the other hand, HIIT lasts nowhere near as long as LISS, so you could argue that HIIT actually burns an insignificant amount of muscle in the comparison.

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