The Claim
In a within-subject comparison, incline curls produce greater hypertrophy of the biceps brachii compared to preacher curls, while preacher curls produce greater hypertrophy of the brachialis and brachioradialis compared to incline curls.
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.
When performed by the same person, incline curls lead to more growth in the main bicep muscle, while preacher curls lead to more growth in the forearm muscles that help bend the elbow.
See the scientific wording
Within-subject comparison of incline curls and preacher curls results in greater biceps brachii hypertrophy with incline curls and greater brachialis and brachioradialis hypertrophy with preacher curls.
When you do incline curls, your biceps muscle is stretched more at the bottom, which makes the top part of the muscle work harder and grow more. When you do preacher curls, your arm is bent in a way that keeps the biceps less stretched but puts more strain on the muscles underneath it, so those muscles grow more.
What the research says
2 studiesStudy: Distinct muscle growth and strength adaptations after preacher and incline biceps curls
This study found that doing incline curls makes the upper part of your biceps bigger, while preacher curls make the lower arm muscles bigger — just like the claim says.
Related videos
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 2 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.