I had my BMR tested at the endocrinologist 2 weeks ago and it came back at 2727 calories per day.
She used a breathing machine to measure the BMR and I had to breath in and out through only my mouth for 10 minutes. At first I was a bit claustrophobic, same when snorkeling, causing me to breath very fast for about 2 minutes.
Would this screw up the test and how accurate is this test?