Originally Posted by
merlinextraligh
If you're training by HR, knowing your LTHR is the base of most HR driven programs. However, you can establish by field tests without spending time and money on the lab.
And when you consider a used power meter setup can be had for $300, or a new wired PT for $600. A couple of Lab test sesssions is a good start on a power meter.
This plus....... even if you know your LTHR, HR lags power so much that it is, IMO, not effective for interval training at z5 and z6.