Being more familiar with strength training where 70% of 1 RM is a ball park minimum intensity to elicit strength adaptations; what is a minimum intensity for AMPK signaling?
I found this indicating 60% VO2 Max but that seems a little low and requiring a significant duration.
Chen ZP, Stephens TJ, Murthy S, Canny BJ, Hargreaves M, Witters LA, Kemp BE, McConell GK. Effect of exercise intensity on skeletal muscle AMPK signaling in humans. Diabetes. 2003 Sep;52(9):2205-12. doi: 10.2337/diabetes.52.9.2205. PMID: 12941758.