PEDS200 Lecture : Sport Nutrition

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taupewalrus464

22 Dec 2011

School

University of Alberta

Department

Physical Education and Sport

Course

PEDS200

Professor

Dan Syrotuik

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Document Summary

Chapter 3, chapter 8 part 1 and 2. Optimal nutrition for exercise and sport y the minimum energy requirement that sustain bodily functions in the waking state is referred to as the basal metabolic rate (bmr). Daily energy expenditure is dependent on: y resing metabolic rate (rmr) including metabolism due to sleep, consciousness, arousal (~60- 75%) y thermal effect of food and eating (~10%) y thermal effect of physical activity and work (~15-30%) Caloric balance y for body mass to remain constant, caloric intake must equal caloric expenditure y the healthiest way to maintain body mass and composition is through a combination of proper nutrition and physical activity y energy balance see-saw . % nutrients in the diet : the big 3 y new guidelines have increase protein range (15 to 30%), lowered % cho (45 to 50%) and fat (25 to 30%). Note average na diet is too high in fat!

Related Questions

The human body converts internal chemical energy into work andheatat rates of 60 to 125 W (called the basal metabolicrate).This energy comes from food and is usually measured inkilocalories[1 kcal = 4.186 kJ]. (Note that thenutritional `Calorie'listed on packaged food actually equals 1kilocalorie). How manykilocalories of food energy does a personwith a metoblic rate of105.0 W require per day? (Assume100 percent efficiency.)

A weightlifter has a basal metabolic rate of 80.0W. As he is working out, his metabolic rate increases by about 650W. (a) how many hours does it take him to work off a 450-calorie bagel if he stays in bed all day? (b) how long does it take him if he's working out? (c) calculate the amount of mechanical work necessary to lift a 120-kg barbell 2.00m (d) He drops the barbell to the floor and lifts it repeatedly. How many times per minute must he repeat this process to do an amount of mechanical work equivalent to his metabolic rate increase of 650 W during exercise? (e) Could he actually do repetitions at the rate found in part (d) at the given metabolic level. Explain?

Energy is conventionally measured in Calories as well as in joules. One Calorie in nutrition is one kilocalorie, defined as 1 kcal = 4 186 J. Metabolizing 1 g of fat can release 9.00 kcal. A student decides to try to lose weight by exercising. He plans to run up and down the stairs in a football stadium as fast as he can and as many times as necessary. To evaluate the program, suppose he runs up a flight of 80 steps, each 0.150 m high, in 65.0 s. For simplicity, ignore the energy he uses in coming down (which is small). Assume a typical efficiency for human muscles is 20.0%. This statement means that when your body converts 100J from metabolizing fat, 20 J goes into doing mechanical work (here, climbing stairs). The remainder goes into extra internal energy. Assume the student’s mass is 75.0 kg. (a) How many times must the student-run the flight of stairs to lose 1.00 kg of fat? (b) What is his average power output, in watts and in horsepower, as he runs up the stairs? (c) Is this activity in itself a practical way to lose weight?

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PEDS200 Lecture : Sport Nutrition

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Physics: Principles with Applications

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