I don’t know if you are a member of the ACSM or have access to their journals, however, here are two peer-reviewed studies you might find of interest.
I am sure if you google the titles, the researchers names will come up with the study.
1. Arterial Saturation During Maximal Exercise Depends upon Capacity to Increase Ventilation.
2. A Comparision of Incremental Exercise Tests During Cyucle and Treadmill Ergometry.
Best to you.