The Claim
Preacher curls performed at long muscle lengths may increase muscle thickness at the distal region of the upper arm, specifically at 70% of the acromion-olecranon distance, in recreationally trained women, with an observed medium effect size (Cohen’s d = 0.623) and approximately a 9% increase in muscle thickness following 9 weeks of training.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Doing preacher curls might help women who work out regularly build more arm muscle, especially toward the lower part of the upper arm, and after about 9 weeks they could see around a 9% increase.
See the scientific wording
Preacher curls may increase muscle thickness at the distal region (70% of acromion-olecranon distance) of the upper arm in recreationally trained women, with a medium effect size (Cohen’s d = 0.623) and approximately 9% increase in muscle thickness after 9 weeks of training, suggesting this exercise performed at long muscle lengths could preferentially stimulate growth in that specific region.
What the research says
1 studyThe study tested preacher curls in women and found they made the lower part of the bicep thicker after 9 weeks, just like the claim says.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.