The Claim
Resistance training performed at long muscle lengths enhances dynamic strength during lengthened elbow flexion in individuals who are trained in resistance exercise.
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 people who regularly lift weights perform exercises that stretch their muscles fully, they gain more strength in movements that involve those stretched positions, such as bending the elbow while the muscle is lengthened.
See the scientific wording
Resistance training at long muscle lengths improves dynamic strength during lengthened elbow flexion in trained individuals.
When muscles are stretched under load, the fibers and surrounding tissues experience more tension, which triggers the building of more muscle protein, especially near the ends of the muscle. This makes the muscle thicker in the stretched position, allowing it to generate more force when bent under load. At the same time, the nervous system gets better at activating more muscle fibers during these movements, making the person stronger specifically when the muscle is lengthened.
What the research says
3 studiesThis study found that lifting weights with your arms stretched out (like at the bottom of a bicep curl) builds strength just as well as lifting through the full motion. So yes, working your muscles when they're stretched helps you get stronger.
People who lift weights and fully stretch their biceps while doing curls get a little stronger at bending their elbow when the muscle is stretched, compared to only doing partial curls.
Study: Mixing Up Muscle Lengths: The Effects of Training at Different Muscle Lengths in the Elbow Flexors
This study found that doing bicep curls with your arm stretched out more made people stronger at lifting with their arm stretched out, compared to mixing in curls with the arm bent. So yes, training with your muscles stretched helps you get stronger in that stretched position.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 3 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.