The Claim
In untrained young adults, eccentric training performed at 30°/s is associated with greater muscle hypertrophy after 8 weeks compared to concentric training at 180°/s, but not compared to concentric training at 30°/s, indicating that the effects of movement velocity on hypertrophy differ between eccentric and concentric contraction types.
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.
If you're new to lifting weights, doing slow eccentric moves (like lowering a weight slowly) at a slow speed might build more muscle than doing fast concentric moves (like lifting quickly), but not more than slow concentric moves — so speed matters differently depending on whether you're lowering or lifting.
See the scientific wording
Eccentric training at 30°/s is associated with greater muscle hypertrophy than concentric training at 180°/s in untrained young adults after 8 weeks, but not greater than concentric training at 30°/s, suggesting velocity effects differ between contraction types.
What the research says
1 studyStudy: The effects of eccentric and concentric training at different velocities on muscle hypertrophy
The study found that slow eccentric lifts (30°/s) made muscles grow more than fast concentric lifts (180°/s), but not more than slow concentric lifts — just like the claim said. So the claim is right.
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.