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I can run longer and faster without struggling or feeling out of breath, yet my watch says my VO2 is dropping. How accurate is it? (alien.top)

submitted 11 months ago by Solitude20@alien.top to c/apple@hardware.watch

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I have been running for a few months (34m), and I can feel I have become more fit when it comes to how I feel and achieve while running. Now my session is more than double the time than when I started, and even when I end it, I would still be in zone 2 as my heart rate and breath rate are lower, unlike when I began running and I would always find myself at zone 4 by half the time (similar pace). Even when I try to run faster, I can do so for longer than before.

Yet, my VO2 max has dropped from 39.8 to 37.8! I would get very surprised every time I see it drop. Why would that be?

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[–] ermax18@alien.top 1 points 11 months ago

The Apple Watch likes you to kill yourself every run which isn’t the proper way to train. If you do a lot of zone2 running it will tank your VO2Max. I pay it no attention other than for giggles.