Procebito is an idiot....He thinks Protein is up there with carbs and is metabolized first before stored body fat is. HAHHAHAHAHAHAHAHAHAHAHAH . If that were the case, we would be storing Protein.hahhahahahhaah What an idiot...I always knew he was a clown.
Carbohydrates and Fats for Fuel
Nutrients get converted to ATP based upon the intensity and duration of activity, with carbohydrate as the main nutrient fueling exercise of a moderate to high intensity, and fat providing energy during exercise that occurs at or below 50% VO2 max. Fat is a great fuel for endurance events, but it is simply not adequate for high level aerobic exercise (over 50% VO2Max) or for anaerobic exercise such as sprints or intervals. intensity. If exercising at or below 50-60% VO2Max, you can utilize fat stores for energy. At a low intensity, you have enough stored fat to fuel activity for several days (most people have 100,000 Calories of energy stored as fat) as long as there is sufficient oxygen to allow fat metabolism to occur.
As exercise intensity increases to 60 and 90% VO2Max, carbohydrate metabolism takes over and is more efficient than fat metabolism. Since a well-fed athlete can hold about 1500 carbohydrate Calories, this level of intensity can be sustained for approximately 2 hours. After that, stored carbohydrates are used up and you may hit the wall or ‘bonk.’ An athlete can sustain 60-90% VO2Max for more than 2 hours by simply replenishing carbohydrate stores during exercise. This is why it is critical to eat easily digestible carbohydrates during moderate exercise that lasts more than a few hours. If you don’t take in enough carbohydrates, you will be forced to reduce your intensity to less than 50%VO2Max and tap back into fat metabolism to fuel activity.
As VO2Max is reached and surpassed, carbohydrate metabolism efficiency drops off dramatically and anaerobic metabolism takes over. This is because your body can not take in and distribute oxygen quickly enough to use either fat or carbohydrate metabolism easily. In fact, carbohydrates can produce nearly 20 times more energy (in the form of ATP) per gram when metabolized in the presence of adequate oxygen than when generated in the oxygen-starved, anaerobic environment that occurs once you reach and surpass your VO2Max.
With training, there are several cardiovascular system adaptations that dramatically improve the ability to reach higher levels of exercise intensity over longer periods of time. First, training can increase an athlete's VO2Max. This improves the efficiency of oxygen transport to working muscles, allowing greater exercise duration at higher intensity before anaerobic pathways are needed. Higher Vo2Max levels also help remove lactic acid more quickly, which leads to faster recovery from anaerobic sprints, or other speed bursts. Another key to training is that it improves an athlete's ability to withstand greater build-up of lactic acid before discomfort requires a reduction in exercise intensity.
