I wouldn't say that I have scientific articles. I have read many articles about youth sports that talk about this notion that we have to compete more than we train. Couple things kind of got me on to this idea about 10 years ago. Jim Humphrey was doing an RTC at Peru and as the kids were wrestling live, he and I got on the subject and really opened my eyes. The main thing I remember is him saying that we wrestle too much and don't practice enough. We don't drill enough and work on the basics enough. He said kids should not be competing every weekend and they should limit the number of national tourneys. So, one thing I've tried to do when I go to camps or clinics is pick the brain of the clinician on this subject. I have spoken to Valentin Kahlika (hopefully I spelled it correctly)...he is Aaron Pico's coach and he was adamant that we have our system backward in the U.S. Jake Herbert came and did a 2 day clinic at Rochester and we talked a lot about their BASE system and it is very similar to what Valentin said. The Soviets do it completely opposite of what we do. When their kids start out, they spend 2-3 years doing tumbling and basic drills. No competition and very little "live" wrestling. The next 2-3 years, they continue with this path, adding more technique and "live". They really start working on sparring and play wrestling at this point. Kids might attend 2-3 tournaments in their region. Once they are teenagers, is when they really start competing. But here is the kicker...they still only compete about 5-7 times per year. Jake and Valentin both said we put too much emphasis on competition and weight cutting. I've talked to Tom Brands, Terry Brands, Cael Sanderson, John Smith, Bruce Baumgartner, Brandon Slay, and basically any other coach that has come to Wabash College's camp. While they all have a little different spin on it, they all agree that we compete too much. One of the things Valentin and Herbert both said is that sparring or play wrestling is vital to development.
There are some good articles out there on Russian Wrestling, specifically one region in Russia that has developed like 90% of all their Gold Medalists in freestyle wrestling. My numbers might be off but it is a crazy stat. Andy Hrovat went and trained there for 6 months and that is where he developed his ideas for the BASE system. He kept a blog and talked a lot about how they do things. It was very interesting.
Hope this helps!
Clint