John Wehrer

I received the final proofs for the 3rd edition of my textbook, "Science and Development of Muscle Hypertrophy." Looking back, it’s remarkable to see how much hypertrophy science has advanced over the past decade. One of the most intriguing developments has been our evolving understanding of the mechanisms underlying hypertrophy. Emerging evidence has helped clarify the intrinsic stimuli that drive muscle growth, and in particular, has increasingly called into question a meaningful role for muscle damage in the process. In the past, I speculated that there may be a “sweet spot” whereby mild muscle damage could enhance anabolic processes beneficial to muscle development (e.g., satellite cell activity, macrophage signaling). However, more recent research suggests these responses are primarily associated with more severe muscle damage, which is inherently detrimental to subsequent performance and, hence, long-term gains. Given the inherent challenges of mechanistic research in humans and the difficulty in establishing causal inference, a contributory role for muscle damage cannot be completely ruled out. That said, if such an effect does exist, it is likely to be minor in practical significance. The mechanisms that drive muscle development remains an exciting area of research that should continue to evolve in the coming years. We know a lot more than we did a decade ago, but there’s still much to learn. The book is available for pre-order on Amazon: amazon.com/Science-Developme…