When trained men estimate how many more reps they could do during weightlifting, their estimates often don't match the actual speed of the barbell. This suggests that relying on self-reported effort...
Mechanism
Synthesis from 1 study
Trained men guess how many more reps they can do based on how their muscles feel, but that feeling doesn’t always match how fast the bar is moving because their brain uses different signals like burn or tiredness — none of which are tied to actual speed, as shown in 10.47206/ijsc.v5i1.393.
Most probable mechanism
When trained men lift weights, their brain estimates how many more reps they can do based on how hard their muscles feel, but this feeling doesn’t always match how fast the bar is moving because different people notice muscle burn, joint strain, or breathlessness differently — and none of these signals are calibrated to actual speed, as shown in studies that compared guesses to bar velocity measurements.
Muscle afferent signals from metabolites, stretch, and tension are interpreted by the central nervous system to generate a subjective estimate of remaining repetitions, but the weighting of these signals varies between individuals and across training sessions, leading to inconsistent perception of effort.
Barbell velocity is a direct biomechanical output of motor unit recruitment and force production, but this objective measure is not consciously perceived or integrated into the subjective RIR estimate, resulting in a disconnect between physiological reality and self-reported fatigue.
Evidence from Studies
Supporting (1)
Community contributions welcome
The Effect of Resistance Training Proximity to Failure on Muscular Adaptations and Longitudinal Fatigue in Trained Men
Contradicting (0)
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