eLife Assessment
The results in this study are useful because they begin to establish a causal link between physical activity and the cellular mechanisms of regeneration. The evidence presented is largely solid, supporting the conclusion that exercise-induced changes in the extracellular matrix disrupt regeneration; however, some claims are incomplete, requiring additional controls and a clearer distinction between the effects of mechanical loading and mechanical injury to the blastema. The work will be of interest to researchers in regenerative medicine.