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DIRECT & INDIRECT CALORIMETRY

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by

rida abeer

on 26 February 2014

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Transcript of DIRECT & INDIRECT CALORIMETRY

DIRECT & INDIRECT CALORIMETRY
What is Calorimetry?
Calor = heat
Metry = measure

Calorimetry = Heat Measure
So what does Direct Calorimetry prove ..
Conservation of Energy




T.E.E. is directly related to Oxygen consumption
Direct Calorimetry
measurement of the amount of heat produced by a subject enclosed within a small chamber.
Bomb Calorimeter
Measures the energy/amount of heat in 1g of food
Atwater & Rosa Respiration Calorimeter
Sometimes also known as the 'Human Calorimeter'

Secure chamber, constant temperature, air seal

Measures metabolic rate at that point

What is Direct Calorimetry?
What is Direct & Indirect Calorimetry?
Direct Calorimetry
measurement of the amount of heat produced by a subject enclosed within a small chamber.
Indirect Calorimetry
measurement of the amount of heat produced by a subject by determination of the amount of oxygen consumed and the amount of carbon dioxide eliminated.
What is Indirect Calorimetry?
Indirect Calorimetry
measurement of Oxygen consumption rather than heat, hence a simpler method
Benedict Roth Spirometer
Oxygen
Wear a nose clip and mouth piece
Records amount of Oxygen intake
Douglas Bag
Carbondioxide
Records amount of Carbondioxide expired
Easiest for use in the laboratory
Max Planck Respirometer
Measures volume of expired air

Measures Energy Expenditure during everyday life and industrial work
By:
- Khadija Inaam-ul Haq
- Rida Abeer
References:
http://medical-dictionary.thefreedictionary.com/direct+calorimetry
http://primalmeded.com/tag/calorimetry/
https://www.google.ae/search?q=direct+calorimeter&hl=en&source=lnms&tbm=isch&sa=X&ei=JwD1UpPkCuLb0QX79YHACg&ved=0CAcQ_AUoAQ&biw=1092&bih=533
Youtube video link 1: www.youtube.com/watch?v=yCxZ3L_VubI
Youtube video link 2: www.youtube.com/watch?v=6OwknLwwnoI
Human Nutrition & Dietetics, 8th edition, Davidson & Passmore.
Watch from 00:47 to 1:25
Full transcript