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1.3.3 Calorie Calculation
The number of calories expended for a given amount of oxygen consumed.
The exact relationship between calories consumed and oxygen consumption
is also affected by the amount of carbon dioxide produced by the body as well
as oxygen consumed. However, the error that occurs by not considering
carbon dioxide is never larger than 1% and is usually less than 0.5% during a
resting metabolic test.
Because the volume of oxygen changes depending on the barometric
pressure (elevation above sea level) and the room temperature where the
measurement is made, it is necessary to convert all measurements to a
standard temperature and pressure. This standard pressure and temperature
is called STPD, (Standard Temperature and Pressure Dry).
The MetaCheck™ measures barometric pressure, relative humidity and
temperature during each automatic calibration cycle. Using these measured
parameters, VO
2
and metabolic rate measurements are all automatically
compensated to standard (STPD) conditions.
1.3.4 Resting Energy Expenditure Measurements
A resting energy expenditure measurement is
intended to measure the number of calories that an
individual would burn if he or she were to be at rest
for 24 hours. For the purpose of comparing the
results against published, predicted normal values,
it is important that the testing procedure follow
some important guidelines. Factors that affect
metabolic rate should be considered. In most
cases, the measured resting metabolic rate will not
be done under theoretically ideal conditions, but it
will be indicative of the subject’s actual resting level
during normal daily conditions.
Basal energy expenditure (BEE) measurements are referred to, but are rarely
truly tested, because of the inconvenience and cost to the individual. BEE
testing requirements usually include a 24-hour fast, monitored body cycles,
and an overnight stay in a clinic. You should note that the MetaCheck™ will
accurately measure BEE if the test is administered properly. A resting energy
expenditure (REE) test, also called resting metabolic rate (RMR), is a
measure of the calories consumed while a subject is at rest. A REE test
should be taken when the patient is sitting, or lying, comfortably, relaxed, and
awake. This indicates how many calories the body is using while in that
resting state. This is measured by the MetaCheck™ and is represented in
calories per day.