Every one’s giving recommendations for jump squats, but in what program context? What was the rest of the program in the study, what was the population, training experience, exercise execution and other training means execution? 30% is often the number given for max power, but surrounded by what other training means and is max power really even the objective best served by jump squats in most programs?
Do you sprint (varies really depending on program, time of year. Accel or starts + IT + tempo, working the entire speed curve?), do plyos (what type, volumes), Do you do medball throws, multithrow (again types, volumes, etc..), olympic lifts (floor, hang, clean, snatch, jerk), static lifts with medium loads with a fast concentric, heavy statics, etc..? Programs are a reflection (or at least they should be) of athlete needs balanced with facility, sports medicine, and other logistical contstraints.
I’m not trying to make it overly complicated, but many are able to do a lot of the above training units. Where then do jump squats fit? I took the lead of a wise coach and have used them with lighter loads and in the context of the above that’s where they usually fit best for me in my programs. Just like any plyo, depth, coupling time, etc.. will affect recruitment patterns and is programmed accordingly.