The Claim
In untrained young adults, performing squats with a 4-second eccentric tempo increases time under tension compared to a 1-second eccentric tempo, despite lower total repetitions and reduced training volume.
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.
When untrained young adults perform squats with a slower lowering phase lasting 4 seconds, the muscles experience more total tension over time than when the lowering phase lasts only 1 second, even though they do fewer repetitions and less overall work.
See the scientific wording
In untrained young adults, a 4-second eccentric tempo during squats results in significantly greater time under tension than a 1-second tempo, despite producing fewer total repetitions and lower training volume, indicating that tempo manipulation can independently alter training stimulus.
When you lower a weight slowly, your muscles stay under tension longer, which forces the endurance-type muscle fibers to grow bigger and work more efficiently, making you stronger even if you do fewer reps.
What the research says
1 studySlowing down the downward part of squats made muscles grow more and get stronger, even though people did fewer reps — proving that how slowly you move matters, not just how many times you do it.
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.