How hard can I train during fasting, without diminishing training results too much?
I am mostly thinking of multi-day fasts, but also when I plan to fast in the morning or have calorie-deficit the day after. (Not fasted training per se)
Should I look at special protocols with eg amino acids or Collagen?
What I often do, is to cut reps/set to 70-80% of max in my slightly eccentric resistance training program. At the same time, I train more like circuit training, with intermixing exercises and shorter breaks.
I know the best, at least for fatloss, is to burn calories with minimum stress and damage, but I do this to maintain my level and "repeated-bout effect", so that I can train hard a few days later with little DOMS.