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Is The Fuel Tank Half-Full

Posted by Dr. Robert Portman on 6/5/2019 to Performance Tip Of The Week
Is The Fuel Tank Half-Full
Your muscles primarily use a mixture of carbohydrate and fat to fuel exercise. At lower intensity exercise fat becomes the primary fuel but as you increase exercise intensity your muscles rely more and more on glycogen. That's what understanding how much glycogen is stored and the rate that it is metabolized is important for every endurance athlete to know. When muscle glycogen stores are depleted you "bonk" or "hit the wall".