Recently I completed a functional (heart rate) threshold on a twenty minute bike session. In February my threshold was 162 BPM, and I would say that for at least the last 5-7 minutes, I was unable to maintain nasal breathing only (instead I needed to mouth breathe).
On April 23, I was able to maintain nasal breathing until minute 18 (of 20) at 166BPM. During the last 90 seconds or so I pushed harder and purposefully started mouth breathing to increase heart rate - but otherwise I could have maintained nasal breathing likely to at least 167/168. Full moon day? New functional threshold on bike...167 BPM
Over the course of the last couple months or so I have noticed that nasal breathing in low 140s was limit. That extended to low 150s and I was really surprised when I hit mid 150s. I had seen low 160's and was pretty sure that would be a max, but was surprised (how with proper nutrition - gels, Cliff Bar, water) by how good nasal breathing at mid 160s felt (after a sufficient warm up and a decent work out day, the previous day).
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