The Claim

Five weeks of resistance training performed with either low or high ratings of perceived exertion (RIR) results in a reduction in torque steadiness during submaximal isometric contractions as fatigue progresses, with no statistically significant difference in this reduction between the low-RIR and high-RIR training groups.

Source: The effects of resistance training to near volitional failure on motor unit recruitment during neuromuscular fatigue

What the research says

Supports is higher

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

Supports
68score
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.

Description
1 study reviewed
In plain English

After five weeks of strength training using either light or heavy effort levels, people show less stability in their muscle force during sustained, moderate-intensity contractions as they become fatigued, and the level of effort used during training does not affect this decline.

See the scientific wording

Resistance training with either low or high RIR for 5 weeks leads to a reduction in torque steadiness during submaximal isometric contractions as fatigue progresses, indicating decreased neuromuscular control, with no difference between training groups.

Why this might work

When muscles get tired during a steady force task, the individual muscle fibers that were first activated lose their ability to produce force. To keep the force level constant, the nervous system turns on additional muscle fibers that are bigger and stronger. These bigger fibers fire in a less precise way, making the overall force output wobble more instead of staying smooth.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: The effects of resistance training to near volitional failure on motor unit recruitment during neuromuscular fatigue

    After five weeks of lifting weights either close to failure or with plenty left in the tank, both groups got equally worse at holding a steady muscle force when tired — meaning how hard you train doesn’t change how much your control drops when you’re fatigued.

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

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