That only talks about strength, not muscle mass. Also there is a difference in what kinds of muscle fibers are added, and which are removed or replaced by othe

That only talks about strength, not muscle mass. Also there is a difference in what kinds of muscle fibers are added, and which are removed or replaced by others. Some are better for endurance, others more for peak strength. My main point is that it is impossible to gain muscle mass faster than you can loose body fat with a proper diet. A proper weight loss in my opinion starts at one kg a week. Extremely obese people should, with medical consultation, aim much higher, though. There is no way you can gain 52kg of muscle mass in a year. Also for shorter periods it doesn't add up.