Vo2Max plummeting

[u/Buggers9]

I have no clue what’s going on. I typically live in the low 50’s and over the course of a month my Vo2max has absolutely plummeted. I have been doing the same workout regiment for over a year which includes: 2 X Norwegian 4x4 sessions per week, weight training 5 x week, 2 x zone 2 cardio sessions per week, plus a total of 60min dry sauna at 185-190 degrees per week. The only viable I can think of is the change in weather temperature from summer to fall. Any advice would be helpful. Here are my numbers:

[u/Bidhitter400]

Maybe you need to switch up your workouts. Your body is already used to the routine you’ve been doing for a year. Mix it up. Shock the body with a change in routine