Lecture 29 - • Key to the system is way to “measure”...

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Kin 110—Lecture #29 Friday April 16 th , 2010 Energy balance = Energy in - Energy out If Energy in - Energy out = 1 oreo cookie/day and each oreo = 50kcal 50 * 365 * $ years = 73,000 kcals 3500 kcal = 1 pound of fat Theoretically gain 21 lb. fat in 4 years Most students do not gain weight this fast because food intake is similar to energy expended. Energy Out = resting metabolic rate (RMR) + diet-induced thermogenesis (DIT) + exercise How do you adjust energy intake to closely match energy expenditure? What does this system require? 1. Assess energy stores and then send the information out 2. Processing center to integrate information and direct a response 3. Systems to change the intake and expenditure in an appropriate directions 4. Feedback to the processing center
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Unformatted text preview: • Key to the system is way to “measure” energy balance (you need a sensor) • What does the sensor actually measure? o Sensitive to some aspect of energy balance. Like what? Increase or decrease in body fat? A fat-o-meter? • Would have to be able to assess increase or decrease in body fat storage. o Where would it be located? In the fat cells Lets say there is a way for fat cells to communicate. How would they do it? Adipostat • Energy balance indicated by changes in body fat • Fat must be sending a signal to the test of the body about energy stores • Something made in fat cells communicated with some other part of the body o What? Hypothalamus o How does a “signal” get from fat cells to the hypothalamus?...
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This note was uploaded on 10/19/2011 for the course KIN 110 taught by Professor Lass during the Spring '08 term at UMass (Amherst).

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