During unilateral resistance training, gains in maximum strength influence absolute muscular endurance positively and relative muscular endurance negatively, suggesting that these two types of...
Mechanism
Synthesis from 1 study
Getting stronger makes you able to do more reps total because your brain tells your muscles to work harder. But since you're now much stronger, doing the same number of reps feels easier relative to your new strength — so your efficiency doesn't improve, it actually drops.
Most probable mechanism
When you get stronger through heavy lifting, your brain sends stronger signals to your muscles, letting you do more total reps before getting tired. But because your muscles are now stronger, the same number of reps feels harder relative to your new strength, so your efficiency doesn't improve — it gets worse.
High-load resistance training increases neural drive from the motor cortex to spinal motor neurons, enhancing motor unit recruitment and firing rates in trained and contralateral muscles.
Increased motor unit activation allows more muscle fibers to be engaged simultaneously and sustained over time, enabling greater total work capacity before fatigue.
The rise in maximal strength elevates the force threshold required to reach task failure during endurance testing, reducing the proportion of available strength utilized per repetition.
As a result, the same number of repetitions represents a smaller fraction of maximal capacity, decreasing relative muscular endurance despite increased absolute endurance.
Evidence from Studies
Supporting (1)
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Unilateral High-Load Resistance Training Increases Absolute but Not Relative Muscular Endurance in the Contralateral Untrained Limb
Contradicting (0)
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