When and how do you use your heart rate information ? What number do you try and stick with and why ?
The very few times I sprint I just ignore my garmin. If I was doing all out intervals I would probably just ignore my garmin also.
I seem to be ok 150 to 165 for 2 hours. I have not tried that pace for longer. While if I did over 170+ I would probably fall over after 5 minutes. ha-ha