Can treadmills for sporting acitivities be used for scientific studies?

Medical grade treadmills for instance from GE case system costs $13`249 (sale price): https://www.cardiologyshop.com/ge-marquette-stress-systems.html Dr. Evan Matthews from Montclair State University uses such a device for doing an exercice stress test: Fellnr has written in his calibration method description: «However, this may give you some rather depressing information, is your treadmill belt may be varying …