@jimpncc Everybody is different, but one thing that I think maybe has been studied, and I’ve certainly noticed anecdotally, is how training in predominantly sprint formats can trigger more of a stress response in your body. If your running around with a jacked up cortisol level from being super stressed, be it emotional or physiological or whatever, your BP is going to be high (and that stress response is the mechanism behind why stress is a modifiable risk factor for a lot of chronic diseases.
Conversely, training in a more low-intensity, steady state fashion is going to give you adaptations that reflect a more efficient heart/lungs, like lower resting heart rate and lower BP and such, and does not put you into a stress state the way that super intense stuff does (unless you drastically overdo it before you’re ready).
I would venture a guess that either the more intense reps, even for super short sets, done that many times throughout the day is possibly giving your body more of a stress response, and/or the absence of other types of training you used to do that previously did give you the benefits more typically associated with lesser intensity, longer duration activity (like going for long brisk walks, or 30 min easy jogs, etc, as opposed to doing hill sprints) is responsible for the change if it’s not just normal minute fluctuation.
Or, you might have more mental/emotional stress and it’s outpacing the benefits of your exercise, or you have congenital hypertension that’s no longer being effectively controlled by your exercise.
If you want to do an experiment, stop your current training and go back to whatever you did before and see if it stops? Or, google the Dan Martin program minimum minimum (or read the stickied thread on it over at the danjohn section on Dave Draper.com forum, or do some other low intensity type of workout) and see if your BP lowers. You could examine if it training-related by messing around with how you train and seeing what happens?