I am currently doing my zone 2 training on a treadmill. To know how to titrate my running speed, I did a VO2Max test at a professional sports center. The upshot was that to get into zone 2 on a treadmill I should run at 7-8.6 km/h and maintain a heart rate of 113-141 bpm.
Now, inspired by Peter Attia's Q&A on zone 2, I said to do a bit of zone 2 heart rate training on a stationary bike.
I rode the bike and noticed that around 2.5 watts per kilo, my leg muscles started to hurt, but my heart rate was low at around 105 bpm on average. This is much lower than what I normally see when I'm near 8.6 km/h on a treadmill (140 bpm).
My questions are:
- Without a lactic meter, is there any way to convert my treadmill VO2Max result in km/h to stationary bike watts per kilo?
- Can I still be in zone 2 on a bike even if my heart rate is much lower than the "equivalent" effort on a treadmill?