The Study
Similar Regional Hypertrophy of the Elbow Flexor Muscles in Response to Low-Load Training With Vascular Occlusion at Short Versus Long Muscle Lengths
This study tested two ways of doing bicep curls and found that both made the muscles grow about the same amount. It’s like testing two different flavors of ice cream to see which one makes you happier — and finding out both make you just as happy. But it doesn’t mean one flavor is better overall — just that in this test, they were equal.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
People lifted light weights with a blood-flow cuff around their arm for 3 weeks, doing some lifts with their shoulder stretched back and others with it bent forward.
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 554 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — even without heavy weights, this method builds muscle evenly along the arm, and shoulder position doesn’t make a difference.
- 2Arm muscles grew by 3.8% to 8.5% in both positions — no meaningful difference between stretched or bent shoulder.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Sports Health
Year
2024
Authors
Levi da Silva Vendruscolo, Helderson Brendon, Victoria Hevia-Larraín, A. Y. Aihara, Vitor de Salles Painelli
Related Content
Claims (10)
Doing resistance exercises with the elbow muscles stretched out or in varied positions leads to a measurable increase in the size of the elbow flexor muscles in people who regularly work out but are not elite athletes.
When performing resistance exercises that stretch the elbow flexor muscles more, the muscles grow larger in cross-sectional area than when the same exercises are done with less stretch.
When training volume and intensity are the same, lifting weights with greater resistance at longer muscle lengths results in the same amount of muscle growth as lifting with greater resistance at shorter muscle lengths.
When the total mechanical workload is the same, training muscles while they are stretched does not consistently lead to more muscle growth than training them while they are shortened.
There is not enough scientific research yet to determine whether training muscles at longer or shorter lengths leads to better muscle growth.
When performing low-load resistance training with blood flow restriction, the elbow flexor muscles grow equally along their entire length, from the shoulder to the elbow, without favoring any specific segment.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.