My wife's VO2Max calculated by Garmin peaked at 73. She was age 72. She is the hour record holder at 38.6 Km age 70 to 74. She is also the 2k pursuit WR holder 70 to 74. She is going for the 75-79 hour record in 2025 with a target of 40 km. She weighs 105 pounds, 9% body fat and works out in the gym daily. She was tested at UCLA sports lab to enter a sports clinical trial and failed to produce any lactate. They disqualified her from the trial. Beware of trials that contain selected athletes.

She is always in beast mode. So there are a lot of other genetic features that matter other than VO2 max when determining if someone if going to set a world record. Her first coach in 2007 when she did her initial simple test on the trainer said Cat 2 power. That was untrained.

Do I believe the 73 VO2 max. Yes, to an extent (it may be higher) coupled with the hour record and 2k performances but I think the determining factors are her lactate production or lack thereof and total focus on performance, strength and weight control.