My max HR is somewhere in the 180-184 range. Those are the highest numbers I've seen in the past year I've started with a HR monitor after 7 years of not using one, and I've only seen 180 once or twice. Typically my HR goes to 170-175 during hard intervals. On the hard 6+ minute intervals today (1+ mile climbs up a 600 vertical foot climb) I didn't see higher than 172 or so. I felt if I pushed harder I was going to detonate. But I was consistently in that 160-172 range. Does that make my 'lactate threshold' about 165-170bpm or so??