[javaru]

"In one study from 2008, rats forced to run wound up with significantly more new brain cells after eight weeks than those who ran when they chose, even though the latter animals ran faster. "

This earlier study's conclusion that the forced aspect was more important than pushing the exerciser outside of their comfort zone. It seems like they should experiment with 45rpm forced exercise to see if that has the same effect. Though, it may have been just the article making that logical jump.