Does stretching your muscles while lifting make them grow longer?
Does longer-muscle length resistance training cause greater longitudinal growth in humans? A systematic review
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Training at longer muscle lengths didn’t reliably increase fascicle length — and when it did, the measurements were likely fake.
Popular fitness influencers claim full ROM = structural muscle lengthening. This review says the evidence is based on flawed tools and inconsistent results.
Practical Takeaways
If you're a beginner, keep doing full-range lifts — you might get a tiny extra boost in quad growth.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Training at longer muscle lengths didn’t reliably increase fascicle length — and when it did, the measurements were likely fake.
Popular fitness influencers claim full ROM = structural muscle lengthening. This review says the evidence is based on flawed tools and inconsistent results.
Practical Takeaways
If you're a beginner, keep doing full-range lifts — you might get a tiny extra boost in quad growth.
Publication
Journal
Sports Medicine and Health Science
Year
2025
Authors
Milo Wolf, P. Korakakis, Michael D. Roberts, Daniel L. Plotkin, M. Franchi, Bret M. Contreras, Menno Henselmans, Stian Larsen, B. Schoenfeld
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Claims (5)
The hypertrophic response to training at longer muscle lengths may differ between untrained and trained individuals, but current evidence is insufficient to determine this due to limited data in trained populations.
Working your muscles through a fuller range of motion during weight training might make them grow a little bigger than training with a shorter range, but it’s not always clear or the same for every muscle.
Some studies say full-range lifting makes muscle fibers longer, but the tools used to measure this might be inaccurate, so we can’t be sure it’s really happening.
No one has actually counted the tiny units inside muscle fibers to see if full-range lifting adds more of them—so we don’t know if that’s really what’s happening.
Most of the studies on this topic are not very well done—they often don’t report enough details, have small sample sizes, or use shaky methods, so we can’t trust their results fully.