My NX990 gps trainer stops receiving data from the heart rate monitor during exercise sessions. What can I do?
The heart rate monitor works on start but in custom (weight lifting and x-c skiing) workout modes, it stops receiving a heart rate until I stop and then start the session again. It (mostly) works in running mode. I've only had a couple of short outages here. Is this something with the monitor, setting or transmitter?
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i guess stopped of use your strap for a long period of time. so you need to nicely clean the strap and try a lot of times until it work again. I happend to me before and the strap worked only after the 10th session on the treadmill
First you need to understand that the Polar system is a medical grade device and it is calculating calories based on specific information that you have inputed and heart rate data from your heart.
Most treadmills and other exercise machines use a much simpler counter that is height and weight based to calculate calories and are generally over generous with their numbers.
Depending on the blood pressure machine you are using, the pulse (not heart rate) is coming through the brachial artery, again not quite as accurate as measuring r-r variance from your heart. There is a ton of literature you can read if you are into the accurateness of the system, but I will sum up with saying that you actual calorie expenditure will be closer on the Polar than on most other devices outside of a hospital. As too the heart rate this is also true, so more likely you are getting inaccurate numbers from the other devices.
If you want pinpoint accuracy then you will need to use the Polar RS800 or S810 devices that measure and display true R-R.
Yes, you definetely need battery replacement. As the hart rate monitoring is most sophisticated part of the device, it has more IC (Integrated Circuits) than any other features. More IC's means more power is needed, so, if the heart rate monitor is starting to malfunction, that's the very first sign of underpowered battery. Find your nearest watch repair shop and ask for battery replacement.