RoadBikeReview.com's Forum Archives - Racing


Archive Home >> Racing(1 2 3 )


Max HR on monitors?(15 posts)

Max HR on monitors?JustAGuy
Jul 30, 2001 3:50 PM
I've been going over some of my HR graphs for the last few months trying to figure my max HR. Is it normal for HR monitors to have a sudden spike or misread?

Sometimes, usually early in my ride (but not always), I'll have my HR up to 250-260! Is this too far out? I am young (16), but 250 really seems out of this world when I'm averaging 160-170BPM on rolling courses, w/ my LT holding around 185. Even on the toughest 1/2 mile 30* grades here my HR will usually not go past 210BPM.

So, is it the HRM? Or does this happen to other people too?

-Drew
I call it Ghost readings.Canidraftyou
Jul 30, 2001 4:32 PM
My HRM does it once or twice a week, with a 6 day work out schedule. "I call ut Ghist readings." What is 30* ??? Your not saying 30%, are you. I would have to travel there and try it. The hardest climb I have done is a 18% here in Arkansas, in a 39/21.

Peace out,
I call it Ghost readings.JustAGuy
Jul 30, 2001 4:40 PM
Yes, 30%, or this is what my friend estimates and calls "the cliff". It's called School Rd, I'll have to get a picture of it, THE worst climbs I've ever ridden.

-Drew
AWSOME...Pic please!!!Canidraftyou
Jul 30, 2001 4:42 PM
Pleases send a pic. I would love to take a shot at it.

Peace out,
30% gradejtolleson
Jul 31, 2001 5:19 AM
sorry, I've got to weigh in. I think your buddy who claims that a paved road can be a 30% grade is mistaken.
30% gradewscott
Jul 31, 2001 5:47 AM
I'm with you, I think 30% would be unrideable even if it was paveable. My impression is most anything over 20% and especially 25% and either your front wheel is coming off the ground if seated or your back wheel is slipping if standing.
30% gradeclimberted
Jul 31, 2001 9:16 AM
I thought that when Tyler Hamilton roke the time record on Mt Washington tha he final K was somewhere around 22%?
>20% not a problem if you know the technique...Biking Viking
Aug 1, 2001 12:16 PM
As a mountain biker I easily clean 25% grades on dirt without rear wheel slip or front wheel lift. It's all about getting in the right climbing position.

Here in the Bay Area we have a road called On Orbit Lane, a part of the dreaded Bohlman - On orbit - Bohlman climb. I run a 25-tooth cog and on the 22% section, my bike literally stops between each pedal stroke and I pull so hard on the bars I am afraid they'll snap off.

Achieving traction or keeping the front down is the least of my problems.

BV
>20% not a problem if you know the technique...wscott
Aug 2, 2001 4:26 AM
On the trail yes, on the road maybe. On the trail you have much more traction in most instances and you can stay seated (much smaller gears) on the tip of your sandle and balance your force so that the front wheel stays down but your rear wheel isn't slipping. Respectfully, I'd imagine the difference between a 22% grade and a 30% grade are fairly significant, with standard road gearing I'd doubt there are too many who could stay seated at 30% (you're nearly coming to a stop at 22%!). Of course this may all be a moot point, can they or do they ever pave anything steeper than around 22%? That seems to be about the steepest I've heard anyone say with some confidence that a road has been, and that's usually for only 10's of meters not even 100's or kilometers at that grade.
More traction on the trail?Biking Viking
Aug 2, 2001 11:36 AM
Usually not. Also, I get out of the mountain bike saddle if it gets really steep. I scoot by butt back, lower my torso, bend my arms and pull BACK on the bars, not UP. (It's almost like a downhill tuck position). Then I carefully adjust my body position back and forth to adjust ground pressure on the wheels.

BV
More traction on the trail?wscott
Aug 3, 2001 3:43 AM
Sure, on the trail you're riding a tire that's almost an order of magnitude wider, running it at much lower pressure which would even increase the contact area more, and the tire is knobby not slick like a road tire. Other than real lose dirt underneath, I'd think we could make a decent argument for more traction on the trail. Isn't that why it's possible to ride really steep stuff on the trail, or is it just lower gears?
30% graderich1
Aug 12, 2001 5:21 PM
i in fact have some hills near me that are paved and are in the 25-35% grade range. one hill is on shore drive in guilford, ct that is a 25-27% stretch about 1/8th a mile though. i only have traction problems when its wet and you must sprint the hill to make it over-
12-14 mph for me. its a real wall.
the next insanely steep hill is on brushy hill road(snake hill)branford, ct, the inside of the switchback is 34%. i sprint that at about 10mph. lol.
i am not mistaken about these grades.
good riding,
-rich
It's likely to be power linespmannion
Jul 31, 2001 6:35 AM
MY HRM tends to shoot to it's own maximum when I go under certain power lines. A lot of HRM's have upper reading limits around the range you are talking about. I see this happen on our club rides and we all get the spike at the same time. Next time it happens to you, try looking up (or around). You may see a power line nearby.
poor contactPingPong
Jul 31, 2001 7:14 AM
It is just due to a poor contact between the sensors and your chest. I get it often early in a ride before the sweat starts to flow.
It is really annoying as I am often looging my heart rate in a certain zone. I usually wet the monitor before I ride, some people recommend using some special Gel if you need an accurate reading, eg doing some testing.
re: Max HR on monitors?SIUSA
Aug 16, 2001 9:37 AM
Hi Drew,

All current heart rate monitors transmit on a very low 5.3khz frequency. This frequency is susceptable to interference from almost anything that generates electromagnetic or microwave radiation. This type of interference will manifest itself as either very high readings or a reading of zero (if the interference is very strong). Unfortunately there is not much you can do about this.

The bad news is, you will not be able to get to your true max during normal training as you will tend to go too hard too soon and will crap out before you reach your true max. If you add 5 beats to the highest normal heart rate you have ever seen you will be pretty close. This means for you your max is probably around 215.
The good news is that max is really a pretty useless number. There is very little training effect on your max hr. Your LT heart rate is a much more effective number to use when doing your training analysis.

Bill Corliss
Sports Instruments