God, this has been well known for many many years. How much did it cost to do the study.
WE now are taking about muscle confusion also being effective, but exercise to muscle fatigue has been long known behind muscle building. Using heavier wts gets you to fatigue faster.
Probably a study that was paid for by the tax payers.
Exactly...my high school biology teacher used to tell us this all the time and some of the kids were very skeptical...but he was right.