Zone 2 run - VO2 Max training effect?

Your HR zones are pretty badly setup. Try setting them up depending on %max HR (of course if you know your max HR)

The zones are also too tight for my opinion. You can try to estimate the zones via any calculator available, like this one: www.myprocoach.net/.../

To my knowledge, HR Zones don't affect VO2max analysis. It is based just on max HR, resting HR, measured HR and HR variability.

Thanks for the reply. I just use the automatic zone calculation in Garmin connect. Looks like the zones don't auto-update when Garmin detects a new LT. I updated them after reading your response and they only moved by 1-2 bpm. From the image above, my max HR of 152 for Zone 2 does seem pretty high. A quick search online and LTHR looks to be a pretty common method of calculating zones. What are the pro's/con's of using MHR vs LTHR vs HRR?

This is right, but if you didn't setup your max hr properly, then you'll receive these high calculated results.

Max HR doesn't mean your max hr for each zone. It means the maximum heart rate that your heart can beat.

An estimate of your max HR can be calculated by using 220 minus your age. But the value depends on your fitness level.

Yes, of course. Sorry, my choice of terminology may have been a little confusing. My max heart rate is taken from all out effort activities and is pretty consistent at 186. When I said max HR of 152 for Z2, I was meaning the upper HR number for the zone. Thanks!