SociallyChallenged
Elite
I'm curious on this as well but I have a specific question. Does static motions on your forearms like deadlifts, farmer's walk, pull-ups, chin-ups work better to increase strength compared to movement motions like forearm curls and crush grippers?
If the forearm is just like any other muscle, logic would say lifting with full ROM will increase strength and size better than static holds.
Thoughts?
Gaining size and strength actually doesn't have much to do with full ROM. It has to do with the amount of fore a muscle produces and the resulting physiologic healing strategies. For example, people like to say full ROM, concetric+eccentric motions are most effective. That's not true. Technically, eccentric exercise alone through the ROM that requires the greatest muscle demand is going to be most effective for exercise adaptations. Isometric exercises are only slightly less useful if you're using heavy enough weight. The only downside with them though is that you pretty much strangle the blood vessels delivering blood to the musculature working. For people with vascular or heart issues, this is not recommended.
So, in essence, isometric holds are highly effective, even moreso than concentric-only work (based on the force-velocity relationship) if you go heavy enough. Personally, I'd suggest using the hand-grippers because you can easily do eccentric work with them without any real extra trouble (close with two hands, slowly release with one). However, eccentric exercises do increase the amount of demand and damage afterwards so eating enough and allowing proper rest for the forearm musculature is essential to avoiding injury.