The Claim
Eccentric and concentric resistance training produce similar overall muscle hypertrophy in healthy adults, with no statistically significant difference in muscle growth (mean effect size: 0.285, 95% CI: -0.131 to 0.701, p = 0.179) across 26 randomized trials involving 682 participants.
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.
Eccentric and concentric resistance training result in the same amount of muscle growth in healthy adults, with no statistically detectable difference between the two methods.
See the scientific wording
Eccentric and concentric resistance training produce similar overall muscle hypertrophy in healthy adults, with no statistically significant difference in muscle growth (mean effect size: 0.285, 95% CI: -0.131 to 0.701, p = 0.179) across 26 randomized trials involving 682 participants, suggesting neither muscle action type is superior for general hypertrophy.
When muscles contract under load, whether pushing or pulling, the force stretches muscle fibers and builds up metabolic byproducts. This activates the same cellular signals that tell the muscle to build more protein and grow larger, no matter if the movement is lowering or lifting the weight.
What the research says
1 studyThis study found that lifting weights by lowering them slowly (eccentric) and pushing them up (concentric) build about the same amount of muscle overall — neither way is clearly better. Some small differences showed up in arms or short workouts, but they weren't strong enough to change the big picture.
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.