Kinesiology 3339A/B Lecture Notes - Lecture 2: Respiratory Quotient, Performance-Enhancing Substance, Carbohydrate

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B) carbohydrate (cho): high intake for a few diets prior to exercise extends time to exhaustion vs. high fat or mixed diets. Tested with a high carb diet, a normal mixed diet, and a high fat diet. Respiratory quotient (rq): volume of co2 that you"re exhaling divided by o2 you"re consuming. If vco2 is a lot higher than the denominator (o2), the ratio goes up from a low to high number. The 3 diets had very different ratios. Exhausted at 90 minutes on the high fat diet, 120 minutes on the mixed diet, and 240 minutes on the high carb diet. The amount of co2 made when using carbs is equal to the amount of o2 you consume. High fat diet had a much lower ratio therefore for given amount of o2, making less co2. A lower rq indicates a lot is coming from fat. The ratio of carbs drops linearly over time and reaches a plateau.

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