It assumes a monotonic relationship between Vo2 and HR/Pace. it is because you train at the max and fatigue kicks in more rapidly. running at 5min/km at 125 bpm indicates better fittness and vo2 than running at 4.30min/km at 175 bpm even though the latter workout is faster and consumes more energy. If that's the case, you could probably hold their wheel and could well have a better 10s sprint! Note: my Garmin estimates my cycling VO2 max to be around 68-70. I suspect this is from my 5 minute power of 437W and to a lesser degree of 60 minute power of 335W, both done while 74-75kg. I1yg.

is a higher or lower vo2 max better