Fuel Ingested During Exercise
Studies show that glucose either taken by mouth or infused into the bloodstream during exercise does not reduce the rate of muscle glycogen utilization (B. Ahlborg et al, 1967b; Bergstrom & Hultman, 1967b; Coyle et al, 1986a; Noakes et al, 1988b). Rather, this glucose is burned by the muscles in place of blood glucose derived from the liver. Thus, glucose or other forms of carbohydrate ingested during exercise will reduce the rate of liver glycogen depletion.
The rate of muscle glycogen utilization appears to increase during exercise in the heat (Fink et al, 1975; Kozlowski et al, 1985; Kruk et al, 1985). This may be one factor explaining impaired running performance in hot conditions.
Weight Loss Tips Without Exercise Photo Gallery
The practical implications of all this information are many. The evidence provided so far indicates that when the body’s carbohydrate stores are depleted, the exercise intensity must fall because the alternate fuel, fat (see Exercises 3.2), cannot be metabolized quickly enough to provide the required energy.
Exercise performance during prolonged exercise can potentially be enhanced by increasing the amount of carbohydrate stored before exercise, by reducing the rate at which those stores are burned during the initial stages of subsequent exercise, and by maintaining a high rate of carbohydrate utilization, particularly when fatigued, via ingestion of carbohydrates in the appropriate amounts.
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