RowIt heart rate oddities

[TheRocketeer]

I am using RowIt on my home PC (dual Core2 2.1 GHz, 3 GB RAM, Windows 7 x64) to monitor my workouts and have run into an odd phenomenon. When I do longish steady-state pieces, the heart rate on RowIt seems to dip catastrophically every so often. I play my music off an external USB drive plugged into the same computer that runs RowIt, but the heart rate reading dips don't happen every time a song changes. Also, the heart rate doesn't disappear from the screen of the PM3 monitor. I can't figure out the correlation.

I've attached a screenshot so you see what I mean. The red line is the heart rate. It's not the worst thing in the world, but anyone else have the same problem?

[edit: removed inline pic]

[Citroen]

Two ideas:

1. Replace the batteries in your HR belt.
2. Upgrade your PM3/PM4 to latest firmware

[TheRocketeer]

Yep, replaced the batteries a couple months back and it has the newest firmware.

[jamesg]

I see something similar: spikes in both rating and Watts. The Watt spikes can be seen in the bar chart too.

[TheRocketeer]

I think I figured out part of it. By dousing my heartrate belt with water before the workout, I reduced the spikiness.

[enki]

For the heart rate issues:
http://www.dcrainmaker.com/2012/12/annu ... pikes.html