How long can you maintain riding at 90% HRM?

That's with zero rest, zero time below 90%. So if you are doing 90% and above and then you rest every 10 min for 30 seconds, it doesn't count.

I dunno? My MHR is 201, and I've spent 30 minutes @ 190bpm before (I assume that's about my LT), but I've never tried seeing how long I can spend at 180...

Is that a tested MHR? That's FAST!

I'm a wimp. I need more training.

Self tested. Body tingling and everything.

I am 21 though, so its about where it should be if you do the 220-age thing.

about 30 minutes or so for me at 90%. Much above that and I fall fast though.....

Question for you guys: would you say that increasing the amount of time you can sustain 90% has helped you on long distance rides? Just curious.

Oh, and question to those two people who can do more than 45 minutes: what did you do to get to that? Were you specifically training for it? Intervals? Long intervals?

Not really an answer to the question but.....I can sustain a high HR much longer in a group than I can solo. Not sure why.

more motivation with others around, probably.

I agree with the above, probably motivation and you get less bored (more to think about) so time passes faster. I can hold a high HR on the road longer than on a trainer because I get so bored on the trainer.

usually until it drops to 89%. time varies though depending on a few things.

Chasing guys faster than me up every hill in sight for years. Lots and lots of time at or over LT. Just endlessly working on holding it there. The other thing is old age and time in grade, as it were. My LT has stayed about the same while my MHR has fallen about 1 beat/year.

Forever once I dial it up to 400 watts.

I <3 Free VO2max testing:

MaxHR is 197bpm, Latic threashold is 188bpm, 90% of MaxHR is 178 bpm. I can ride all day there until cardiovasular drift happens.

Actaully, to be honest, I've never really tried to see how long I could hold it there. According to tests and research, I should be able to hold that HR until glucose = no mo but, like i said, never tried.

baby faced assassin.

Random side note:

Research has show that the 220-age thing is often 10-15 beats off.

Records indicate 43 min 59 sec longest spent @ 172 (max HR 192) since October on the powertap HRM. I did 40.53 km in 1 hr 5 min for the bike leg of a team triathlon that avg'd 176 on a polar HRM.

Don't pay much attention to it anymore though.

Bicycling had a article how about a biking vactation in NC. In it they said that there was a 65 year old on the trip that normally trains for 4 hours at 95% MHR...

Sounds like the usually Bicycling exaggeration to me.

Max of 203.
So 90% is 182. I remember dying for about 40 min [I tried an over-extended tempo run] - my lowest HR was 186 and was topping 193. It hurt. I needed to lie down afterwards

I felt like I failed - only because my goal was an hour @ that pace.

Or he has no clue what his max HR really is.....

Last year at a 20K TT my HR never dropped below 180. As I recall avg for the TT after cool down was something in the 170s. My max that I have seen is 203.

I am 35 and hit 196 last week on the MTB and was frequently in the 180s. I seem to have a very high HR.

I was doing some tests on Monday with my coach and we stopped the test when i pinged 210bpm (I'm 25). Heart gave out before the legs, i was still spinning at 88 rpms. It was only at 350 watts though... I'm hoping the coach will help with that. [Managed 927 watts in a sprint later though ]

LTHR at 95% of maximum HR would be extremly high. (see .e.g. https://jap.physiology.org/cgi/conten...ract/56/5/1260)

So a couple of thoughts:

1) how was your LTHR determined (blood measurements in a lab?)

2) your LTHR pretty much correlates to your functional threshold for 1 hour.

3) It's extremely difficult to sustain work at LT Threshold for over an hour, so if your working all day at this level it's not your true functional threshold.

4) The variability of HR's for individuals is the reason to train with power.

5) And to actually try it, go do a 40k TT, and see what you get for an average HR.

my max is around 196, though I haven't gotten to 196 in a long time. I should see if I can still get up there. When I TT or crit, my average is around 181bpm, so I assume that's my LT.