House of Hypertrophy
Training biceps at longer lengths may slightly increase size, but mixed-length training works just as well for growth and strength.
Both training methods build muscle similarly, with no clear advantage for longer-length training despite minor trends.
We checked the science
our breakdown of the video
10 claims, each mapped to its moment in the video
When performing resistance exercises that stretch the elbow flexor muscles more, the muscles grow larger in cross-sectional area than when the same exercises are done with less stretch.
Evidence points in both directions — no clear conclusion yet.
To measure muscle growth in the upper arm, researchers use specific measurements including the muscle's cross-sectional area, thickness at two points along its length, and the circumference of the arm at three different positions.
Strong evidence from clinical studies backs this claim.
Doing resistance exercises with the elbow muscles stretched out or in varied positions leads to a measurable increase in the size of the elbow flexor muscles in people who regularly work out but are not elite athletes.
Multiple causal studies (randomized trials and reviews) support this claim.
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.
Multiple causal studies (randomized trials and reviews) support this claim.
Measuring muscle thickness at a few spots on the body may not correctly show how much muscle has grown overall, because the measurements might be inaccurate or have not been properly tested for reliability.
Strong evidence from clinical studies backs this claim.
When people perform resistance exercises with their muscles stretched to a longer length, they tend to gain more size in the lower part of their arms than when they perform the same exercises with muscles at varying lengths.
Evidence contradicts this claim.
The changes in muscle size caused by different workout routines may be too small to measure accurately with current tools, making it impossible to tell which routine is truly more effective.
Evidence contradicts this claim.
When people who exercise recreationally train with their muscles stretched more during movements, they gain a bit more muscle size compared to training with varied muscle lengths, but both approaches lead to the same improvement in strength.
Multiple causal studies (randomized trials and reviews) support this claim.
When people who already train regularly perform resistance exercises until they can no longer complete another repetition, and they do enough total work, their muscles grow larger, no matter which exercises they choose.
Multiple causal studies (randomized trials and reviews) support this claim.
There is not enough scientific research yet to determine whether training muscles at longer or shorter lengths leads to better muscle growth.
Multiple causal studies (randomized trials and reviews) support this claim.
Key Takeaways
Summary
Based on the video transcript only.
- 1Problem: People want to know if training biceps with arms stretched back (long muscle length) grows them more than using a mix of stretched and contracted positions.
- 2Core methods: Lengthened cable curl, shortened cable curl
- 3How methods work: Lengthened cable curls stretch the biceps by extending the shoulder, while shortened cable curls contract the biceps with the shoulder closer to the body; both stress the muscle differently during movement.
- 4Expected outcomes: Both methods grew the biceps similarly; long-length training showed slightly bigger arm size trends, but not enough to be meaningful.
- 5Implementation timeframe: Results were measured after two 8-week training blocks with a break in between.
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