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I'm returning after 3 months off with yet another injury and am under strict instructions to control speed/distance and increases. My first couple of runs were 10 mins on the dreadmill and tonight I did 3k at 10km/h. According to the HRM on the dreadmill my HR was 164-166 during the last km. My Max HR was 179 when I checked it about 6 months back before injury. My question is, if this is correct, thwhy how was I still able to breathe through my nose throughout ? Surely I should have been out of breath a little with that HR ?