The squat sticking point is set on the way down
In short
Thirty resistance-trained male collegiate lifters performed 1RM free-weight squats and maximal isometric squats matched to the same postures within the sticking region. Despite identical positions, the 1RM squat produced significantly greater vertical ground reaction force, hip and knee extension torque, ankle plantarflexion torque, and higher muscle activation in the vastus medialis, tibialis anterior, and both gastrocnemius heads. The authors attribute the surplus to the preceding eccentric (lowering) phase and conclude that eccentric-focused strategies may enhance force production through the sticking region.
In the mid-range zone where 1RM squats most often stall — the sticking point — a real squat produced more force than a maximal isometric push from the exact same position. Thirty trained lifters were measured. The only difference between the two conditions was whether a descent came first.
Why does the sticking point exist?
The sticking region is the section of the ascent where force output and joint torque drop sharply. How much load you can tolerate through it effectively caps the lift. This study confirmed the same marked drop in output during the free-weight squat.
What was compared, and how?
Thirty resistance-trained male collegiate participants performed 1RM free-weight squats and maximal isometric squats at several heights within the sticking region, with posture matched between conditions. A 3D motion-capture system, a force platform, and surface electromyography (sEMG) recorded output at the same positions simultaneously.
The results all pointed one way. The 1RM squat showed significantly greater vertical ground reaction force, greater hip and knee extension torque, greater ankle plantarflexion torque, and higher sEMG amplitudes in the vastus medialis, tibialis anterior, and both heads of the gastrocnemius. Lowering and then driving up extracted more output at the same joint angles than pushing maximally from a dead stop.
Why does the descent add force?
The authors interpret the surplus as the extra mechanical demand of the preceding eccentric phase raising joint torque and muscle activation into the sticking region. The descent is not the rest portion of the rep — it is where the output needed to clear the weakest zone gets loaded.
Their practical suggestion follows directly: eccentric-focused strategies. That ranges from simply lowering under control with full tension to methods that overload the descent itself, like eccentric overload training. By contrast, training with the eccentric removed gives this contribution away.
What changes for a 1RM attempt
The squat 1RM that feeds your Muscle Index succeeds or fails mostly in this zone, and this measurement says how you control the descent is part of what you can produce there. If your max attempts keep dying at the sticking point, audit your eccentric alongside how to train your weakest lift.
The sample was 30 resistance-trained male collegiate lifters and the only exercise was the squat. The interpretation comes from comparing dynamic and isometric squats — no specific training method, such as tempo or paused squats, was directly tested.
Frequently asked questions
What is the squat sticking point?
The mid-range section of the ascent where force output and joint torque drop sharply, making it the most likely place for the bar to stall. The load you can tolerate through it effectively determines your squat 1RM.
Why did the real squat produce more force than a posture-matched isometric?
Because an eccentric (lowering) phase came first. Across 30 trained lifters, the 1RM squat showed significantly greater vertical ground reaction force, hip and knee extension torque, and muscle activation than a maximal isometric squat in the same positions.
How should you train to break through a sticking point?
The authors point to eccentric-focused strategies: lowering under control with full tension, and methods like eccentric overload that add load to the descent itself.
Does this mean paused squats are bad?
The study did not test paused squats. It does show the eccentric contribution fades the longer you sit in the bottom, so a paused squat is best understood as deliberately training your ability to drive up without that help.
Does this apply to the bench press or deadlift?
Only the squat was measured. The bench press has a sticking region too, but whether the eccentric contributes the same surplus there cannot be answered from this data.
Source: PubMed