The Claim
The triceps brachii long head demonstrates a 1.5-fold greater hypertrophic response to mechanical tension from lengthened muscle positions than the lateral and medial heads under identical training conditions.
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 performing overhead elbow extensions, the long head of the triceps muscle grows 1.5 times more than the lateral and medial heads under the same training conditions.
See the scientific wording
The triceps brachii long head exhibits greater hypertrophic sensitivity to mechanical tension from lengthened muscle positions than the lateral and medial heads, as evidenced by a 1.5-fold greater growth response to overhead elbow extensions compared to a 1.4-fold increase in the monoarticular heads under identical training conditions.
When the long head of the triceps is stretched deeply during overhead arm extensions, the muscle fibers experience more tension along their length, which triggers signals inside the muscle cells to build more protein and grow larger than the other heads that don't stretch as much.
What the research says
1 studyWhen you do arm extensions with your arms overhead, the long part of your triceps gets stretched more than the other parts, and this study shows it grows bigger as a result — even when you’re lifting lighter weights.
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.