Betablocker and VO2 decrease

[2nccoast]

OP - I think the only accurate way to measure VO2max is to have it directly measured, in a lab. I don't know the algorithm Garmin uses for computing VO2 so I can't comment on it; I use my Garmin mostly for tracking running distances as I think their heart rate monitor is also rather inaccurate. The hospital where I work has a Sports Med lab and would do a VO2 test for around $200, pre-Covid.

For VO2max, you can use the different methods outlined in this page:
VO2max Calculator | SHAPESENSE.COM

If all of your results cluster about the same figure, your VO2max is probably in the ballpark.

[SmartMoney]

Be careful if you experience any shortness of breath - I didn't see that here reading, but I found out the hard way I was allergic to Inderal. Took 2 doctors and an emergency room over 4 days to dx my respiratory distress as an allergic reaction to this beta blocker. I was in my 30s when this happened and was taking it as a prophylactic for migraines.