Lecture 19 - Kin 110 Lecture#19 March 22nd 2010 1800s...

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Kin 110 –Lecture #19 March 22 nd , 2010 1800’s Leibig bullies everyone into believing protein supplies all energy for exercise. Nitrogen excretion good estimate of protein use. Nitrogen excretion changes with DIET Carbon dioxide excretion changes with WORK. 2 German researchers decide to challenge idea that protein alone powers exercise. Wondered whether oxidation of CHO and fats also supplied energy for exercise. o Work= force x distance o Force= body weight against gravity o Distance = vertical distance Estimate use of protein for energy by measuring nitrogen in sweat. Sweat nitrogen is higher when Cho supplies are low. 1. How much does protein contribute to energy expenditure under “normal” conditions? Used fact that PRO is 16.25% nitrogen to turn grams of N into grams of PRO At 4 kcal/gram could calculate kcals from PRO. Compared that with kcals total work Kcals from PRO = about 25% Kcals total work Energy from protein breakdown was not the major contributor to exercise energy.
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