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

I've been increasing my running over the last 4 months. Most practice runs are slow, zone 2, heart rate 125. Sometimes I run the first 5k fast or mix it up by HIIT runs. The watch says my VO2Max has consistently increased and my last practice run, 5 days ago, hit a new personal high. 4 miles. So then two days ago, I'm at an actual 5k run, which is only 3 miles. I go all out, heart rate 157 average, time significantly faster than practices. My VO2Max goes down.

I know it's just an estimate, but this peeves me. I have two theories:

distance matters. The real race was shorter so I get less credit.
Race speed went up, but heart rate went way up. So maybe it's like in a car if you increased the RPM of the motor but the car speed didn't go up linearly. Like the transmission is slipping.