8392 Lecture Notes - Lecture 2: Indirect Calorimetry, Vo2 Max, Spirometry
20 Jun 2018
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Lecture 2 – Calculating Aerobic Capacity: Open circuit spirometry
- Why?
oEnables us to capture expired air while someone is at rest or exercising
oWe can then analyse for O2 and Co2
oCan find
Resting VO2
VO2 max
Calculate RQ
Calculate METS
- Douglas bag
oOriginal and best way to directly identify oxygen utilization and indirectly measure
energy expenditure
o
oTemp gauge measure temp of expired air
oWhen bag is closed; shut off but open to the environment
oWhen open; metal bit pointing towards open to collect samples
oWhen don’t want to capture air; douglas bag need to be closed
oMouth piece; one way valve
White side pointing out toward environment
find more resources at oneclass.com
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oSpit collector; tube that sits down the bottom
oNose clip to block nose to capture all air coming out of mouth
oTubes; 3 way valves
Look for holes that come through the valve
oGas analysis
Flow meter 1L-min
See whether flow meter shows air going through the system
Ball should pop up and bounce a little to make sure air is running through
the system
If its not; tap isn’t open the right way
Let air run through for about a minute to help with calculations
After 20-30secs the readings stabilize
Oxygen would go down with exercise
oBeing used during exercise
Carbon dioxide would go up
RER greater than one; respiratory compensation for working at a
high intensity
oEvacuating the air
Attach vacuum to douglas bag, reset to 0
Turn pump on and air is drawn out of the douglas bag
oTemperature ‘in’
When evacuating the bag, record the highest temp whilst the air is going
into the pump
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Lecture 2 calculating aerobic capacity: open circuit spirometry. Why: enables us to capture expired air while someone is at rest or exercising, we can then analyse for o2 and co2, can find. White side pointing out toward environment: spit collector; tube that sits down the bottom, nose clip to block nose to capture all air coming out of mouth, tubes; 3 way valves. Look for holes that come through the valve: gas analysis. See whether flow meter shows air going through the system. Ball should pop up and bounce a little to make sure air is running through the system. If its not; tap isn"t open the right way. Let air run through for about a minute to help with calculations. Oxygen would go down with exercise: being used during exercise. Rer greater than one; respiratory compensation for working at a high intensity: evacuating the air. Attach vacuum to douglas bag, reset to 0.
