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Apple Watch Series 12 reports lower VO2 Max than Series 7

Switching from a Apple watch 7 to a 12, my VO2 Max is 15-20% less on the 12 than it was on the 7. I did a watch to watch conversion when I got the new watch and all my body measurements are the same. Redoing the same exercise routine on the old watch yields the higher result. Customer care was unable to figure out the reason.

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