Influence of Resistance Training Proximity-to-Failure, Determined by Repetitions-in-Reserve, on Neuromuscular Fatigue in Resistance-Trained Males and Females

Training muscles to the point of failure reduces gains in strength because it increases fatigue without producing significant improvements in nerve signaling or physical force production.

For trained men doing bench presses to failure with one-minute rests, doing more than four sets reduces the physical load and metabolic demand on the muscles, as shown by slower movement and less total time under tension, but does not eliminate the stimulus entirely.

When people lift weights and stop three repetitions before failure, they experience less muscle fatigue 24 hours later and lift faster compared to stopping one repetition before failure or going to complete failure.

When people train to muscular failure, their bodies take longer to recover than when they train without reaching failure, even if the total amount of work done is the same.

When lifting weights until complete exhaustion, the total number of repetitions performed across all sets is lower than when stopping one repetition before failure, because fatigue reduces performance in later sets, even if the first set has more reps.

When men and women who regularly lift weights perform bench presses until they can't complete another rep, men show 29% more short-term muscle fatigue than women. However, when they stop short of failure—at one or three reps in reserve—there is no difference in fatigue between the sexes.