The Claim

Nine weeks of Nordic hamstring exercise training leads to increased torque levels at which motor unit recruitment and de-recruitment occur, while motor unit discharge rate returns to baseline, indicating a shift from early neural to later structural adaptations as a contributor to strength gains.

Source: Biceps femoris long-head motor unit discharge rates and recruitment thresholds vary across 9 weeks of eccentric training

What the research says

Supports is higher

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

Supports
31score
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.

How it works
1 study reviewed
In plain English

After nine weeks of Nordic hamstring training, the nervous system activates muscle fibers at higher force levels, and the firing rate of those fibers returns to normal, suggesting that muscle structure changes become more important than nervous system changes for gaining strength.

See the scientific wording

After nine weeks of Nordic hamstring exercise training, motor unit recruitment and de-recruitment occur at higher torque levels, while discharge rate returns to baseline, suggesting a transition from early neural to later structural adaptations contributing to strength gains.

Why this might work

At first, your nerves fire faster to make your muscles stronger, but after weeks of training, your muscles physically change so they can produce more force without needing faster nerve signals. Your muscles now turn on and off at higher levels of force because they’ve grown longer and more sensitive, so they stay active longer during relaxation and only activate when really needed.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Biceps femoris long-head motor unit discharge rates and recruitment thresholds vary across 9 weeks of eccentric training

    After nine weeks of Nordic hamstring exercises, your muscles learn to turn on and off at stronger force levels, but your nerves stop firing faster — meaning your muscles got stronger because they physically changed, not because your nerves worked harder.

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

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.