The Claim
In previously untrained healthy young men, increases in normalized quadriceps surface electromyography amplitude during maximal contractions are moderately associated with gains in knee extension strength after 15 weeks of resistance training, with correlation coefficients of 0.58 for isometric maximum voluntary torque and 0.56 for one-repetition maximum.
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 healthy young men who have not previously trained, greater electrical activity in the quadriceps muscle during maximum effort is linked to larger increases in knee extension strength after 15 weeks of resistance training.
See the scientific wording
In previously untrained healthy young men, increases in normalized quadriceps surface electromyography amplitude during maximal contractions are moderately associated with gains in knee extension strength after 15 weeks of resistance training, with correlation coefficients of 0.58 for isometric maximum voluntary torque and 0.56 for one-repetition maximum.
When a person trains their thigh muscles with heavy lifting, their brain sends stronger signals to the muscles, causing more muscle fibers to turn on at the same time. At the same time, the muscle fibers themselves get bigger because they make more contractile proteins. Both of these changes allow the muscle to produce more force when the person tries their hardest. The bigger muscles generate more force directly, while the stronger brain signals make the existing muscle work more efficiently.
What the research says
1 studyAfter 15 weeks of leg workouts, guys who got better at turning on their thigh muscles during hard efforts also got stronger — but not as much as those who gained more muscle. The study proves this connection is real, but muscle growth matters 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.