For this chain-of-thought reasoning and answer, what was the question?
To answer this question, we should know that: Based on the measured distance, an estimate of VO max (in mL / ( kg min) ) is:
A: mL / ( kg min
Q: Kenneth H. Cooper conducted a study for the United States Air Force in the late 1960s. One of the results of this was the Cooper test in which the distance covered running in 12 minutes is measured. Based on the measured distance, an estimate of VO max (in mL / ( kg min) ) is:

Based on this passage, what is the unit of measurement for vo2max?