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Using average HR during race as an estimation of LTHR?....(5 posts)

Using average HR during race as an estimation of LTHR?....SS_MB-7
Oct 6, 2003 6:45 AM
During the first two cyclocross races this fall, my average HR has been 175 bpm. The races have each been 1 hr in length. I recall reading in Friel's Bible that a race inflates the heart rate slightly, so with that, what would be a good estimate of my LTHR? 170?

Ride Hard,
Mike B.
Cross fans: Now THAT is a runup!Spunout
Oct 6, 2003 7:06 AM
More like a climbup! Neat to see the Altitude data. You lapped me just before the last hairpin, Mike. I spent alot of time on the ground in the mud, but you coudn't wipe the grin off my face!

Anyways, I would say your threshold is 175(or higher). You pushed hard early in the race and let up a bit near the end (still lapping me, I might add). If you were to conclude that 170 is your threshold, the data doesn't fit with the first half performance.
Britannia pics....SS_MB-7
Oct 6, 2003 7:32 AM

In case you didn't know, Joe @ MTBKanata was busy snapping pics at the 2 Britannia races: Race 2 and Race 3.

I was at yesterday's Madison race, but as a spectator, not a racer since my wife was out-of-town for the weekend. I couldn't race since I had my 2 kids (3 and 1-1/2 yrs) with me. Plus, I was pretty run-down for a mid-week cold.

Ride Hard,
Mike B.
Thanks for the pics link, what a great service...Spunout
Oct 6, 2003 7:49 AM
I did Tour des Ponts yesterday, 170 km at 30km/h with a little 45km/h kick after the Qyon ferry. Ugh.

See you out there week after next!
From my experience...biknben
Oct 6, 2003 8:23 AM
I do occasional LAT tests using one of Friel's workouts. It's the last "test" workout in his book. You do a race effort for 30 minutes. You hit the lap button after 10 minutes. The Avg. HR for the last 20 minutes is you LTHR.

When comparing the test to my races I find that it is right on. Recently, my tested LTHR was 181. In nearly every MTB race I did this year, my avg. HR was 178. I assume the slightly lower HR is due to the extended duration of the race. They are about 1.5 to 2 hours. My HR tends to drop later in the race due to fatigue. From your graph, it looks like your HR did the same.

I use the 30-minute test to point out trends in my fitness. The test are always done on the same stretch of road under similar circumstances. This minimizes the variables. Trying to dirive LTHR from races may give varied results due to the course, competition, and duration. Still, I don't consider the test result numbers to be absolute. I use it to adjust my HR zones and guage fitness from month to month.