In an excellent series of articles in the British Journal of Sports Medicine (summarized HERE) the authors reviewed the literature and published findings from their own study on this question: Can too much training be bad for you and cause you to be at greater risk of injury?
And a beautiful InfoGraphic summarizing this article was published on a blog HERE.
Athletes, coaches and sports medicine providers of all persuasions may find great benefit!
~Thanks for reading!
Dr. Joel Carmichael, DC, DACBSP