Rhonda Patrick· PhD
So specifically on the cortisol level, and again, I think the latest systematic reviews, meta-analyses, the studies vary a little bit, but by and large, I don't think individuals need to worry about chronic increases in cortisol levels systemically that are gonna cause them damage. Clearly, cortisolle levels can go up, just like catecholamines go up acutely during exercise. But I think there's some evidence now that would suggest that actually, in individuals that practice interval training, basal cortisol levels actually stay lower than prior to baseline.