I'm less convinced by studies that use an unconventional control group. What I mean by unconventional is primarily the single set of 30 reps once a week, which is not representative of conventional wisdom in weight training (conventional wisdom would be 3-5 sets of 5-8 reps, with a rest of at least a minute between). Another factor is that they are doing maximal eccentric movements. This means lowering a weight slightly heavier than the subject is able to lift slowly. Does this make the study invalid? Not clear, but it makes it less clearly applicable.