I had a personal training for a while and he would mix in what he would call "negatives" that were exactly that. For example, we'd set up in a bench press and he'd assist in lifting the bar up, then it was on me to slowly lower it back down. According to him, you're able to use your strength more effectively going down, so I was actually able to do more than I could normally bench this way. Similar story with concentration curls.
Exercises can also have a "tempo" variation, where you slowly do one of the parts, with "tempo squat" probably being one of the most popular ones where descent takes 3-5 seconds.
Opinions vary, but solo alternative is to cheat the up phase with momentum, and then control the down phase.
Similar thought. Article states you can use both arms/legs to lift and one to place down. Both arms to do the curl up, one arm to bring down. Both legs on the the leg press machine up, one down. Butlers likely would also work, but wasn't studied ;)
what I got always told is to have to do the eccentric part of the exercise longer than the concentric one. helps
As the article says, feel free to use two hands to raise the weight, but only one to lower it.
Sounds like you'd just have to do twice as many reps, one for each arm. I get that those reps would notionally be more effective, but enough to balance out? Seems unlikely.
This sounds like a very quick way to gain an injury. I've usually had negative experiences with doing things in this manner.