The best replacement for vo2 is heart rate.

The best alternatives to vo2 are rated as following:
★★★★★  heart rate
★★  vco2
★★  vo2 max
★★  work rate
★  heart rate graph
★  vo2max
★  absolute vo2
★  relative vo2
★  max vo2
★  power output
★  hr graph
  ve

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vo2
heart rate
vco2