The Claim
In untrained individuals, resistance training performed twice weekly for 7 weeks at 60–70% 1RM to failure produces significant muscle hypertrophy and strength gains, regardless of eccentric phase duration.
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.
In people who have not trained before, doing resistance exercises twice a week for seven weeks at 60–70% of their maximum strength until muscle failure results in measurable increases in muscle size and strength, whether the lowering phase of the movement is slow or fast.
See the scientific wording
In untrained individuals, resistance training performed twice weekly for 7 weeks at 60–70% 1RM to failure produces significant muscle hypertrophy and strength gains, regardless of eccentric phase duration, suggesting that training to failure may be a more potent stimulus than tempo manipulation.
When someone lifts weights until they can't do another rep, the muscles are stretched and squeezed hard enough to trigger new muscle growth and stronger nerve signals. This happens whether the weight is lowered slowly or quickly, because the key is pushing the muscle to its limit, not how fast it moves. The muscle gets bigger from building more protein inside its fibers, and the nervous system gets better at turning on more muscle fibers to produce force.
What the research says
1 studyFor beginners, lifting weights until you can't do another rep twice a week builds muscle just as well whether you lower the weight slowly or quickly. Strength still goes up either way, though slowing down the weight a bit helps a little more.
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.