The Claim
In young, trained men, resistance training with moderate loads (55–70% 1RM) and velocity loss ≥30% results in a higher proportion of slow, fatiguing repetitions (mean propulsive velocity <0.90 m/s) compared to resistance training with 10% velocity loss, and this condition is associated with impaired adaptations for explosive movements despite equivalent gains in maximal strength.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In young, trained men, performing resistance exercises with moderate weights and allowing at least 30% drop in movement speed leads to more slow, fatigued repetitions and reduced improvement in explosive power compared to exercises with only 10% speed drop, even when both methods produce the same increase in maximum strength.
See the scientific wording
In young, trained men, resistance training with moderate loads (55–70% 1RM) and velocity loss ≥30% leads to a higher proportion of slow, fatiguing repetitions (MPV <0.90 m/s) compared to 10% velocity loss, which may impair adaptations for explosive movements despite similar strength gains.
When people lift weights until their movements become very slow, their muscles accumulate fatigue that changes the type of muscle fibers used for fast movements. This change makes the muscles slower and less powerful, so even though they get stronger overall, they lose the ability to jump or sprint quickly. Training with less fatigue keeps the fast muscle fibers working at high speed, which preserves explosive power.
What the research says
1 studyStudy: Effect of velocity loss during squat training on neuromuscular performance
When people do squats and keep going until they’re super slow (30%+ velocity loss), they end up doing too many tired, sluggish reps that hurt their ability to jump or sprint fast. Doing fewer reps and stopping before they slow down much leads to better speed and jumping gains — even if both groups get equally strong.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.