I’ve read some people that recommend training based on HR instead of power, and getting your HR to 90% of max HR or above your LTHR if your know it.
I’ve got a good idea what my LTHR is, from a few different vectors.
Been doing Vo2max intervals, either 30s on / 15s off, or 3m on / 3m off. My time for heart rate above LTHR is significant;y below the time my power is spend in Vo2max. I know that the first ~90s of an interval end up being anaerobic before oxygen is depleted. The power to HR time disparity is quite large though. For about 10 minutes in vo2 power, I am seeing about 4-5 minutes where my HR is sustained above LTHR.
It seems most people talk about time in power zone when referring to vo2max intervals, so interested what others see for their time in heart rate zone that is above LTHR (or 90% of max HR) when doing vo2max intervals.
My worry is 5 minutes isn’t enough time and I need to find a way to dig harder and get more out of the intervals. My best was just shy of 10 minutes above LTHR, but this week, even with strong recovery (3 days of just 1h endurance and good sleep; recovery sore in 90%+ for 2 days) I only had HR above LTHR for about 5 minutes.
Or maybe I should just get my heart rate into zone with the first couple intervals being a hard start, and then just keep the intensity up and stop looking at HR for the rest of the intervals.
What do others see for vo2max interval HR zone time that they are satisfied with the quality on?