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Assessment
What is the energy measurement difference when using different types of gas collection devices, such as facemask, mouthpieces with nose clips, or canopy (e.g., ventilated hood)?
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Conclusion
Under rigorous control with no air leaks occurring, four studies of neutral design suggest comparable RMR measures in free-living adults can be achieved using either canopy, mouthpiece and nose clip, or facemask gas collection devices. However, in one neutral quality study, mean RMR was 7% higher for facemask and 9% higher for mouthpiece compared to canopy. Because of conflicting data and recent advances in technology, further studies comparing gas collection devices are needed, including in clinical populations.
The first 5 minutes of data should be discarded no matter which of the three collection devices are used.
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Grade: III
- Grade I means there is Good/Strong evidence supporting the statement;
- Grade II is Fair;
- Grade III is Limited/Weak;
- Grade IV is Expert Opinion Only;
- Grade V is Not Assignable.
- High (A) means we are very confident that the true effect lies close to that of the estimate of the effect;
- Moderate (B) means we are moderately confident in the effect estimate;
- Low (C) means our confidence in the effect estimate is limited;
- Very Low (D) means we have very little confidence in the effect estimate.
- Ungraded means a grade is not assignable.
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Conclusion