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)?
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.
- 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.