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Title: FAT BURNING
Someone told me recently that the body does not start to burn fat until 15 mins into a workout, and that for the first 15 mins it just uses up your sugars (energy?). Is this true? And what is the best way to maximise fat burning through exercise?
Someone told me recently that the body does not start to burn fat until 15 mins into a workout, and that for the first 15 mins it just uses up your sugars (energy?). Is this true? And what is the best way to maximise fat burning through exercise?
Name: Nermine
Date: Feb. 16th, 2003
Date: Feb. 16th, 2003
Title: Re: FAT BURNING
Need more convincing from what I said?
http://en.bioscience.org/1998/v3/d/holloszy/1.htm
-"fat utilization during exercise is not tightly regulated, as there are no mechanisms for closely matching availability and metabolism of fatty acids to the rate of energy expenditure. As a result, the rate of fat oxidation during exercise is determined by the availability of fatty acids and the rate of carbohydrate utilization"
-"As relative exercise intensity is increased, there is a decrease in the proportion of the energy requirement derived from fat oxidation and an increase in that provided by carbohydrate oxidation. During moderately strenuous exercise of an intensity that can be maintained for 90 minutes or longer (~55-75% of VO2max), there is a progressive decline in the proportion of energy derived from muscle glycogen and a progressive increase in plasma fatty acid oxidation. "
-"Oxidation of fatty acids (FFA) can provide much of the energy for prolonged moderate intensity exercise. Under normal physiological conditions the extent of fat utilization and carbohydrate sparing during exercise depends on plasma FFA concentration (25), relative exercise intensity (26-28), carbohydrate availability (29-32) and training status (33-36). Maximal rates of plasma fatty acid oxidation are attained at a relatively low exercise intensity requiring ~40% of VO2max (27,37,38). An individual's plasma FFA concentration at a given exercise intensity is largely determined by nutritional status (17,27,29,30,33,35,39,40) and duration of exercise (41). Eating carbohydrate lowers plasma FFA both by increasing insulin levels and by providing glycerol phosphate for fatty acid resterification and storage as triglyceride (16,29,42,43). Thus, eating a diet low in carbohydrate raises plasma FFA and results in carbohydrate sparing, but is counterproductive because it reduces glycogen stores (44,45) and, therefore, endurance (39). Similarly, prolonged fasting results in a progressive rise in plasma FFA but also has the disadvantage of reducing glycogen stores"
-"During exercise performed after an overnight fast, 70-90% of the energy required at low exercise intensities in the range of ~25-30% of VO2max is supplied by the oxidation of fat."
Important one-"During the first 30 minutes or so of moderate intensity exercise in the fasting state, plasma fatty acids and muscle triglycerides provide roughly equal amounts of the fat that is oxidized. When the exercise is continued beyond 30 minutes, oxidation of plasma fatty acids provides progressively more of the total energy requirements, compensating for the decreased utilization not only of muscle triglycerides but also of muscle glycogen (27). This increase in plasma fatty acid oxidation during prolonged exercise is made possible by a progressive rise in plasma fatty acid concentration, and is necessitated by a progressive depletion of muscle glycogen and triglyceride stores. "
There's not two answers for this, only one.
Name: Joe
Date: Feb. 16th, 2003
Date: Feb. 16th, 2003
Title: Re: FAT BURNING
Joe, Can you please state all of what you said in English?
Thanks
Name: Rondell
Date: Feb. 22nd, 2003
Date: Feb. 22nd, 2003
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