The Claim

Nordic hamstring exercise training increases the torque at which motor units are recruited by 12% after three weeks and by 16% after nine weeks, indicating a progressive shift toward requiring higher force output to activate these motor units.

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.

Quantitative
1 study reviewed
In plain English

Performing Nordic hamstring exercises over several weeks leads to a measurable increase in the amount of force needed to activate muscle motor units, with greater increases seen after longer training periods.

See the scientific wording

Nordic hamstring exercise training increases the torque at which motor units are recruited by 12% after three weeks and 16% after nine weeks, indicating a progressive shift toward requiring higher force output to activate these motor units.

Why this might work

When you repeatedly do Nordic hamstring exercises, your muscles are stretched under heavy load, which sends signals to your spinal cord. Over time, your spinal cord becomes harder to trigger, so it takes more force to turn on your muscle fibers. At the same time, your muscle fibers themselves change shape and become longer, which makes them send stronger signals when stretched — this also makes your muscles stay active longer even as you relax. Together, these changes mean you need more force to start using your muscles, and once they’re on, they stay on longer, making your movements more controlled and powerful.

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 doing Nordic hamstring exercises for 3 weeks, your hamstrings needed 12% more force to start firing their nerve signals, and after 9 weeks, that increased to 16%. The study directly measured this and found it to be true.

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

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