Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
delta weight =?
|
delta energy in - delta energy out
|
|
|
How do we quantify energy intake?
|
all substrates coming in are producing energy
|
|
|
what is a calorie
|
the amount of energy required to raise 1 cc of water 1 degree celsius
|
|
|
1 Kcal = ? joules
|
4.2
|
|
|
Describe how a bomb calorimeter works.
|
1. dried sample of food
2. fill it with pure O2 (want to burn everything) 3. spark it (blows up) 4. measure the rise of temperature in water |
|
|
what are the calories of all carbs? proteins?
|
carbs 4.15 kcal/g
proteins 5.65 kcal/g |
|
|
Why are alcoholics rarely fat?
|
b/c alcohol seen as a toxin and thus uses up energy for detoxification
|
|
|
2 ways of estimating energy expenditure
|
indirect and direct calorimetry
|
|
|
How does indirect calorimetry work?
|
note the amount of O2 going in and CO2 coming out--> calculate how much energy youre expending
|
|
|
What's RQ?
|
Respiratory Quotient.
CO2/O2 gives you CO2: O2 ratio. when burning 1 mole of glucose (carb), its one. (1 mole of fat = .7) |
|
|
What do we need to know to estimate energy expenditure?
|
1) amount of )2 consumed or CO2 expired
AND 2) RQ |
|
|
What's really being measured in indirect calorimetry?
|
really measuring ATP production
ATP production = ATP utilization energy expended = energy produced |
|
|
What are some problems with measuring energy expenditure?
|
1) can't measure for long periods of time (interferes with life)
2) not very natural -use room for analysis -restricts range of movements |
|
|
What's so important about double-labeled H20?
|
isotopes of H and O in body..use radioactive label for H and O isotopes, and can calculate:
rate of Oxygen lost-rate of H lost which equals Co2 you're spilling out. If we know RQ, we can calculate metabolic rate. |
|
|
How is food quotient calculated?
|
from amt of carb, fat, protein, and alcohol in the diet.. estimate of RQ based on composition of diet.
|
|
|
In a graph of amt of label left vs. time, what would the difference b/w and active and inactive person be?
|
space in between two lines (oxygen and hydrogen) = amount of CO2 expired. so for an active person, the space is going to be bigger than an inactive person.
|
