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Interesting Factoid # 228
On Sat, 15 Dec 2007 06:51:09 -0800, Prisoner at War wrote:
"During exercise, your muscles use a metabolic priority system for generation of energy. This is particularly true during aerobic exercise. First, carbohydrate is used, then fat, then protein. Because of the tremendous stress that resistance training puts on the muscles, the metabolic priority system gets ignored. When cortisol is released, it causes a breakdown of protein, carbohydrate, and fat...." -- from "Nutrient Timing" (2004) Implications: Cardio is the best for burning fat, best for weight-loss, given that carbs and fats are utilized first. (Protein isn't tapped as a resource until about an hour of cardio, according to another passage in the book.) This debunks the myth propagated in weight-lifting circles that even a resistance-exclusive program can promote weight loss. Remaining Questions: How, exactly, does this metabolic priority system get thrown off track by the intense conditions created by serious weight-lifting? The "metabolic priority system" does not get thrown off track by resistance training. Lifting weights is, by its nature, a short duration, anaerobic activity. Even very "intense" resistance training is characterized by relatively short bouts of high intensity activity followed by a recovery period. As a result, it uses anaerobic energy systems, which only 'burn' carbohydrates. The idea that resistance training on its own can lead to reductions in body fat is not entirely false. Muscle is primarily where fats gets 'burned'. Adding muscle will increase a person's metabolic rate. And, resistance training burns calories, where ever they may come from, thus helping to eliminate excess calories. So, it is possible to loose fat by lifting weights. But, it is not necessarily the most effective way to reduce body fat. |
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Interesting Factoid # 228
On Mon, 17 Dec 2007 07:58:47 -0800, Prisoner at War wrote:
On Dec 16, 8:02 pm, Shava_X wrote: The "metabolic priority system" does not get thrown off track by resistance training. But he said it did -- the author is the longtime chairman of kinesiology at Texas University, and an actual researcher in this field, too! Lifting weights is, by its nature, a short duration, anaerobic activity. Even very "intense" resistance training is characterized by relatively short bouts of high intensity activity followed by a recovery period. As a result, it uses anaerobic energy systems, which only 'burn' carbohydrates. Well, that's precisely what I was wondering! What's the mechanism whereby protein is burned for fuel -- and why should it be tapped first during anaerobic activity but last during aerobic activity? I'm just reading his book all over again now, having forgotten a lot of the details, so maybe he covers it later on...but it's not something that seems immediately sensible, that a "metabolic priority system" should get screwed up by one kind of physical effort but not another. The idea that resistance training on its own can lead to reductions in body fat is not entirely false. Muscle is primarily where fats gets 'burned'. Adding muscle will increase a person's metabolic rate. And, resistance training burns calories, where ever they may come from, thus helping to eliminate excess calories. So, it is possible to loose fat by lifting weights. But, it is not necessarily the most effective way to reduce body fat. All true -- this is what makes so-called "spot shaping" possible (not spot reducing, mind you, but spot shaping). But I've actually heard it said that cardio is not necessary at all if you lift intensely, so I just wanted to put to rest that myth. If that is what the author put, then the author is just plain wrong. given His credentials, i can only speculate that He was trying to simplify things and did a poor job. The mechanism my which protein is tapped for fuel is call gluconeogenesis. It is the process whereby protein is turned into glucose. It is not very efficient, and that is why protein is tapped as a fuel source *Last*. |
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