Source credit: PubMed record and free full text in PubMed Central for Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions, published in the Journal of Sport and Health Science. DOI: 10.1016/j.jshs.2025.101104. PMID: 41276164.
Short summary
A new review in the Journal of Sport and Health Science argues that mechanical tension remains the main evidence-backed driver of resistance-training hypertrophy, while several popular explanations for muscle growth are often overstated.
The authors review claims around acute hormone spikes, metabolic stress, cell swelling, “the pump,” and sarcoplasmic hypertrophy. Their bottom line is not that training feel is irrelevant, but that coaches and lifters should be careful about treating transient sensations as proven causes of long-term muscle gain.
Why it matters for lifters
For bodybuilders and strength athletes, the practical message is to keep the program centered on high-quality loading, progressive tension, adequate volume, and repeatable execution. Pump work can still have a place in a session, but this review cautions against building a whole hypertrophy plan around burn, swelling, or hormone-hack language.
The review also reinforces a realistic expectation: early strength gains are not always the same thing as new muscle tissue, and long-term progress depends on consistent training stimulus, recovery, nutrition, and individual response.
What to watch next
Watch for future long-term studies that compare hypertrophy outcomes across training styles while measuring actual muscle architecture and fiber-level changes. For now, lifters should read this as a reason to prioritize durable programming over novelty claims.
Health disclaimer: This article is for informational purposes only and is not medical advice. Talk with a qualified health professional before changing your training, nutrition, supplement, or medical plan, especially if you have an injury, condition, or recent surgery.