The Study
Does Muscle Length Influence Regional Hypertrophy? A Systematic Review and Meta-Analysis
This study looked at lots of other studies and found that lifting weights with your muscles stretched more or less doesn’t seem to make one part of your muscle grow much more than another—but we don’t know if those original studies were fair or not, so we can’t say it definitely causes the same growth.
Analysis score
Maximum 100 for a systematic review with meta-analysis.
Where the score came from
Scientists looked at whether doing exercises that stretch your muscles more makes them grow bigger in different parts.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 533 / 100
Quality score
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Key takeaways
Summary
Based on the study abstract and findings.
- 1These tiny differences are too small to matter for most people trying to build muscle.
- 2Muscle growth was almost the same whether muscles were stretched more or less: changes ranged from -1.92% to 4.34%.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
International Journal of Sports Medicine
Year
2025
Authors
Dorian Varović, Milo Wolf, B. Schoenfeld, James Steele, J. Grgic, P. Mikulic
Related Content
Claims (7)
When you do exercises that stretch your muscles more through a bigger movement—like doing full squats instead of tiny half-squats—you may build more muscle tissue than when you stay in a shorter, more restricted movement range.
Exercises that position biarticulate muscles at longer lengths (via joint angle manipulation) produce greater hypertrophy in those biarticulate muscle heads compared to exercises that place them at shorter lengths.
Isometric contractions performed at longer muscle lengths produce greater muscle hypertrophy than isometric contractions performed at shorter muscle lengths.
Even though muscles might grow a tiny bit more at the far end when stretched more, it’s so small that it doesn’t really matter in practice — all parts grow about the same.
Doing strength exercises with your muscles stretched more or less doesn’t seem to make much difference in how much each part of the muscle grows — all parts grow about the same.
Whether you do strength exercises with your muscles stretched out or more shortened, your muscles grow about the same amount in different parts — no big difference.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.