Preserving Muscle Mass During a Long Diet?

Hi Christian,

A while back you wrote that you would have an upcoming article on the topic of preserving musclemass during a diet. I know you favour Heavy lifting (4-6) reps to preserve strength during fatloss phases since one then preserves as much muscle as possible.

What would the ideal frequency of training, and if possible the best kind of programs for a goal of maximum muscle preservation during a prolonged fatloss phase?

Would a small amount of isolation work be acceptable (lateral raises) or just counterproductive since one probably will not build alot of muscle when in a caloric deficit?

In short, what kind of setup for training would be optimal in your opinion?

Thanks in advance