Testing And Recording Equipment Flashcards
What is indirect calorimetry?
The measurement of the amount of heat/energy generated in an oxidation reaction by determining the intake or consumption of oxygen or by measuring the amount of carbon dioxide released and translating these quantities into a heat equivalent.
What is a metabolic cart?
A device which works by attaching headgear to a subject while they breathe a specific amount of oxygen over a period of time.
What is calorimetry?
Measurements of the heat/energy eliminated or stored in any system.
What equipment is used when measuring indirect calorimetry?
Metabolic cart
How does indirect calorimetry work?
A technique where headgear is attached to a subject while they breathe for a specific amount of time.
Their inspired and expired gas flows, volumes and concentrations of O2 and CO2 are all measured.
Why is indirect calorimetry good?
Its a non-invasive technique and is regarded as being relatively accurate.
What does a metabolic cart do?
It’s an electronic medical tool used to measure the body’s metabolism through the amount of heat produced when the body is at rest.
What can the calorimetry result do?
Can help tell doctors more about a person’s overall health condition.
What factors does the metabolic cart use to calculate heat production?
1 - the intake of oxygen for the body.
2 - output of carbon dioxide.
How is heat production measured?
Resting energy expenditure (REE)
Why does REE change?
Changes with regard to a persons overall weight or height to weight ratio. Age and gender can also influence the result of this test.
Chemistry of the body in response to various drugs
Its lower in women
Increase with smoking and drugs
What is the REE?
The amount of energy, usually expressed in Kcal, required for a 24-hour period by the body during rest.
How can indirect calorimetry and the use of a metabolic cart help individuals?
To determine their energy expenditure and response to nutrition over time.
To calculate energy expenditure which allows determination of nutritional requirements/caloric needs.
Who are classified/potentially classified as obese
In the calculation of their REE, which helps medical staff determine the amount of food and nutrition needed.
What can affect the reliability and validity of indirect calorimetry and the use of a metabolic cart?
Inaccuracies from air leaks.
Possible inaccuracies from measurement/recording errors.
Difficult to use on children
Overfeeding/underfeeding may occur based on results received.
Single snap shots are worse than ‘average results/studies’ over a longer period of time.
The process actually measures consumption, not needs.
