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Old 01-26-05, 12:18 PM   #1
jslopez
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HRM inconsistency

So I got the Reebok precision HRM from nashbar and I've nocited big rises and drops from the HRM (from 160 to 130 in a second then back up to 160s again.

Is this a matter of placement, tightnes of the strap, changin of the batter (bradn new HRM though) or maybe I should be wetting the sensors more(although this happens during the middle of the ride so I think the third oiption would be pretty useless)?

Or is this just something to expect?
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Old 01-26-05, 12:29 PM   #2
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i got the same problem with mine. although i have a polar s150. do you have the watch part attached to your wrist or on the handlebars? mine seems to lose the signal when it's further away from my body so i'm going to try to mount it on the bars. i wonder if all the layers of winter clothing have something to do with it as well???
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Old 01-26-05, 01:00 PM   #3
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Quote:
Originally Posted by timmhaan
i got the same problem with mine. although i have a polar s150. do you have the watch part attached to your wrist or on the handlebars? mine seems to lose the signal when it's further away from my body so i'm going to try to mount it on the bars. i wonder if all the layers of winter clothing have something to do with it as well???

On the loss of signal I found that making sure the sensors were wet (and once you had a ride going) it would show the HR, the inconsistency is what gets me though. We were doing a steady climb the otehr day and I was at 165 and it kept droping dramatically then would stay back to the 165 range
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Old 01-26-05, 01:10 PM   #4
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Quote:
Originally Posted by jslopez
On the loss of signal I found that making sure the sensors were wet (and once you had a ride going) it would show the HR, the inconsistency is what gets me though. We were doing a steady climb the otehr day and I was at 165 and it kept droping dramatically then would stay back to the 165 range
You may want to try a product similar to this:

Link to Performance Brand Signal Enhancer for HRM

I lightly lube both the HRM (where the sensors are), and my chest (where the sensors contact) before strapping on my HRM. I have a Polar unit, and have had no problems with losing signal. Good luck!
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Old 01-26-05, 03:11 PM   #5
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I would try to rule out positioning first; rule that out because it's the simplest.

Also tightness of the strap. I think one guy said sometimes he got going really fast, enough that the wind flapping his shirt around caused the sensor to move out of position. Obviously you don't want it too tight, but it should be fairly snug.

For lube/wetting: the above recommended stuff is probably OK but you can also use inexpensive and readily available saline solution for contact lenses. Personally, I've always found my own sweat to be more than sufficient, even with a very hairy chest

Interference is a possibility if you are near others that have HRMs. Not sure if any ol' wireless device could cause interference; maybe. If you notice this problem consistently at a particular location on your ride, you might check that out (may not be much you can do, though). EMF disturbance (high voltage wires) could do it too.

Could be a defective unit.

Very unlikely, but not impossible: you may have arrhythmia (irregular heartbeat) or other abnormal heartbeat which can confuse some HRMs.


Polar has some info (not necessarily specific to Polar HRMs) that may help: http://support.polar.fi/PKBSupport.n...1?OpenDocument
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