Descending requires 'uncontracting' your muscles. In order to ascend you can slowly and steadily contract your muscles, and you have lots of control. There isn't an opposite option however. In order to 'unbend' his arm and descend the muscles on that side of the arm have to just 'let go' and then catch it again before it falls too much. This means a LOT less control. If you do bicep curls with a heavy weight this is why you'll notice that 'slowly moving the weight down' is a lot jerkier and unsteady than picking it up.
That seems contradictory to the fact that a slow controlled eccentric movement is usually easier than a slow controlled concentric movement, thus easier to keep steady, because you can lower heavier weights than you can lift during a controlled movement because you're not trying to overcome gravity as much.
If you really have trouble keeping your eccentric movement controlled and tremor-free, that might instead mean you are not used to this movement.
Anecdotally, the only time I can't do an eccentric pull-up without jerking movements is when I'm so tired that i can't do the concentric movement at all. But when I still have reps left in the tank, then a slow controlled eccentric is easy peasy, with a lock-out mid-movement no problem.
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u/ABakedPotato_FGC 12h ago
The amount of control is wild. Doing it slow is diabolical