The Claim
Twelve weeks of isotonic resistance training employing eccentric, concentric, or eccentric-concentric contractions at slow or fast velocities increases isotonic strength (measured as 1RM) by 25–41% in young healthy males, demonstrating that multiple resistance training modalities can effectively improve maximal strength in the knee extensors.
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 young, healthy guys do strength training for 12 weeks using different types of muscle contractions—whether slow or fast—they’ll get significantly stronger in their thigh muscles, no matter which style they pick.
See the scientific wording
Twelve weeks of isotonic resistance training using eccentric, concentric, or eccentric-concentric contractions at slow or fast velocities increases isotonic strength (1RM) by 25–41% in young healthy males, indicating that multiple resistance training modalities can effectively improve maximal strength in knee extensors.
What the research says
1 studyThe study gave young men different types of leg exercises for 12 weeks and found that all of them made their legs much stronger—by 25% to 41%—no matter if they pushed up fast, slow, or let the weight come down slowly. So yes, the claim is right: lots of ways to train work.
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.