The Claim
After 8 weeks of velocity-based squat training with 10% or 20% velocity loss, countermovement jump performance showed no significant improvement in trained female basketball players.
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.
Trained female basketball players who did velocity-based squat training for 8 weeks with either 10% or 20% velocity loss did not show any increase in their countermovement jump performance.
See the scientific wording
Countermovement jump performance did not significantly improve in either the 10% or 20% velocity loss group after 8 weeks of resistance training in trained female basketball players, suggesting that this specific movement may not be sensitive to the neuromuscular adaptations induced by velocity-based squat training.
When lifting weights quickly, the body activates fast-twitch muscle fibers that fire rapidly, improving power in movements like sprinting and squat jumps. But the countermovement jump requires a quick stretch of the muscles before contracting, and this specific training does not train that stretch-reflex pattern. Even though the muscles get stronger and fire faster, they don't learn to use the stretch efficiently, so the jump doesn't get better.
What the research says
1 studyAfter doing squats with a special speed-based training method, the basketball players got better at sprinting and other jumps, but not at the countermovement jump. This suggests that kind of jump might need a different kind of training.
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.