Why arm position matters more than barbell shape in bicep curls
Bilateral Biceps Curl Shows Distinct Biceps Brachii and Anterior Deltoid Excitation Comparing Straight vs. EZ Barbell Coupled with Arms Flexion/No-Flexion
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When you curl weights, bending your arms at the shoulder makes your biceps and front shoulder muscles work much harder than keeping your arms straight down.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
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A snapshot of a population at a single point in time. Can identify correlations and prevalence, but cannot determine the direction of cause and effect.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When you curl weights, bending your arms at the shoulder makes your biceps and front shoulder muscles work much harder than keeping your arms straight down.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 537 / 44
Evidence Score
A snapshot of a population at a single point in time. Can identify correlations and prevalence, but cannot determine the direction of cause and effect.
Publication
Authors
Coratella G, Tornatore G, Longo S, Esposito F, Cè E
Related Content
Claims (6)
Performing different types of biceps curls, such as hammer curls or preacher curls, leads to different amounts of muscle growth and strength improvements depending on how the movement is performed.
When performing biceps curls with a weight that allows 8 repetitions, bending the arms during the upward motion increases electrical activity in the biceps muscle by about 18% to 20% compared to keeping the arms straight, based on measurements from trained bodybuilders.
When lifting weights with straight arms, a straight barbell causes slightly higher activation of the biceps muscle compared to an EZ barbell, but this difference disappears when the arms are bent.
When performing biceps curls, the front part of the shoulder muscle activates more strongly when lifting the arm forward than when lowering it, showing that this muscle helps stabilize the shoulder during elbow bending.
When lowering a barbell during a bicep curl, the biceps muscle activates more when the arms are hanging straight down than when the shoulders are bent forward, and this difference is larger with an EZ bar than a straight bar.