The Claim
Total time under tension during resistance exercise to volitional failure is significantly correlated with integrated electromyography (iEMG) amplitude, indicating that longer muscle contraction duration is associated with greater cumulative motor unit recruitment.
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.
During resistance exercise to muscle failure, longer muscle contraction time is associated with higher total electrical activity in the muscles, reflecting greater cumulative activation of motor units.
See the scientific wording
Total time under tension (TUT) is significantly correlated with integrated EMG (iEMG) during resistance exercise to volitional failure, suggesting that longer duration of muscle contraction is associated with greater cumulative motor unit recruitment.
When a muscle is worked until it can't move anymore, waste products build up inside the muscle fibers. These waste products trigger nerves that send signals to the spinal cord and brain, forcing the nervous system to turn on more muscle fibers to keep pushing. The longer the muscle stays under tension, the more waste builds up, and the more fibers get recruited, leading to higher total electrical activity in the muscle.
What the research says
1 studyEven with light weights, if you hold the muscle under tension longer until you can't do another rep, your muscles fire more overall — like keeping a light bulb on longer makes it use more electricity, even if it's dimmer.
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.