When people lift weights until they can no longer complete another repetition, they experience more short-term muscle fatigue than when they stop a few reps before failure, as shown by slower...
Mechanism
Synthesis from 1 study
When people lift weights until they can't do another rep, their muscles get so tired that their nerves can't signal them to contract as hard or as fast, making them move slower and do fewer reps — this is shown in the study with DOI 10.1080/02640414.2024.2321021. Stopping before failure lets the...
Most probable mechanism
When people lift weights until they can't do another rep, their muscles get more tired during each set, which makes their nerves less able to signal the muscles to contract strongly — this causes them to move slower and complete fewer reps, as shown in the study with DOI 10.1080/02640414.2024.2321021.
Training to momentary muscular failure increases motor unit recruitment and metabolic byproduct accumulation during concentric and eccentric contractions, elevating acute neuromuscular fatigue.
Elevated neuromuscular fatigue reduces the ability of motor neurons to sustain high-frequency firing, decreasing the number of active motor units and their firing rates during subsequent repetitions.
Reduced motor unit recruitment and firing rate directly impair muscle force production, leading to measurable declines in lifting velocity and increased repetition loss across sets.
Evidence from Studies
Supporting (1)
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