The Claim
In untrained young adults, performing barbell squats with a 4-second eccentric phase for 7 weeks results in a greater increase in one-repetition maximum strength (effect size = 1.60) compared to a 1-second eccentric phase (effect size = 0.99), with a statistically significant between-group difference (p < 0.05).
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.
Untrained young adults who perform barbell squats with a 4-second lowering phase for 7 weeks gain more strength in a one-repetition maximum test than those who use a 1-second lowering phase.
See the scientific wording
In untrained young adults, performing barbell squats with a 4-second eccentric phase for 7 weeks results in a greater increase in one-repetition maximum strength (effect size = 1.60) compared to a 1-second eccentric phase (effect size = 0.99), with a statistically significant between-group difference (p < 0.05), suggesting slower eccentric tempo may enhance strength gains in compound lower-body movements.
Lowering a heavy weight slowly stretches muscle fibers for a longer time, causing the endurance-oriented muscle fibers to grow bigger. These bigger fibers produce more force and work more efficiently during maximum efforts, making it easier to lift heavier weights.
What the research says
1 studyPeople who slowly lowered the barbell during squats for 7 weeks got much stronger than those who lowered it quickly — the study proved it with numbers.
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.