Resistance exercise performed to muscular failure with high repetition volumes (8–12 reps) causes greater acute reductions in neuromuscular function and slower recovery of movement velocity and jump height compared to non-failure protocols, with impairments persisting up to 48 hours post-exercise in young, trained men.

When muscles are pushed to failure with many repetitions, they run out of energy quickly, break down their own energy stores, and tear apart tiny parts of the muscle fibers. This damage and energy loss make the muscles weak and slow to respond, so movements like jumping or lifting become slower and weaker for up to two days until the body repairs the damage and restores energy.