New research concludes that muscles adapt in a non-uniform way in response to resistance training and particularly during eccentric loads. With non uniformity there is always a risk of muscular imbalances. If those imbalance are overlooked, and since we tend to compensate with our stronger muscles, this can result in injury due to unbalanced load on the weak muscles.

Abstract here: http://www.sciencedirect.com/science/article/pii/S105064111100188X