Agonist neural drive, measured as changes in quadriceps EMG during maximal voluntary contraction, is the strongest single predictor of individual strength gains after 12 weeks of resistance training, accounting for 30.6% of the variance in strength improvement.

Source: Changes in agonist neural drive, hypertrophy and pre-training strength all contribute to the individual strength gains after resistance training

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports

25score

Challenges

0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation

1 study reviewed

In plain English

The amount of electrical activity in the quadriceps muscle during a maximal effort is the best single indicator of how much strength a person will gain after 12 weeks of weight training, explaining about 30.6% of the differences in strength gains between individuals.

See the scientific wording

Agonist neural drive, measured as changes in quadriceps EMG during maximal voluntary contraction, is the strongest single predictor of individual strength gains after 12 weeks of resistance training, accounting for 30.6% of the variance in strength improvement.

Why this might work

When you train your muscles, your brain gets better at sending stronger and more frequent signals to the muscle fibers, which makes them contract harder. This improved signal comes from your spinal cord and brain becoming more efficient at activating the motor nerves, and it happens faster than your muscles grow bigger. The stronger and more coordinated the signals, the more force your muscles can produce, which is why this is the biggest reason people get stronger after training.

Verified mechanismbased on 1 study

What the research says

1 study

Study: Changes in agonist neural drive, hypertrophy and pre-training strength all contribute to the individual strength gains after resistance training
After 12 weeks of leg training, the biggest reason people get stronger is because their brain gets better at telling their thigh muscles to work harder — and this study proves it's the top factor, even more than muscle growth.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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