What's your max HR?

[Veronica]

Veronica, that's interesting that you get speed, cadence and HR spikes all at the same time. What kind of monitor do you use? (Mine's a Garmin Forerunner 301.) I wonder if you've got intermittent battery contact?

It always happens in the same spot, when I pass under some power lines on a local ride. I use a Polar 720.

V.