I have a couple of questions regarding the "sphere" of lifting exercises...why does dynamic dominate over isometric based training? Dynamic over Isometrics
By "dominate", I assume you mean that dynamic movements are trained more that isometric actions.
If so, the two primary reasons are...
1) Lack of Isometric Knowledge. Individuals are unfamiliar with the training effect obtained from them. Plus, they don't know enough about isometrics to write a program.
2) Unable to measure progress. Weight have a "Yard Stick" which allows you to measure progress.
Isometrics only have a time differential.
Gym talk revolve around how much weight your pushing or pulling, not about how many seconds you pushed against an immovable object. Functional Isometrics
The exception to is Functional Isometrics in which weight is used. Google it to find out more.
Is it more effective?
Absolutely! Isometrics allow for an all out effort at the point of exertion.
Isometrics allow you to strengthen you "Sticking Point".
I realize most lifts use some sort of isometric muscle use even when the lift is dynamic...but wouldn't an isometric-based workout be closer to real life scenarios? And what I mean by that is, generally, pushing a heavy object, lifting, and pulling don't generally use a dynamic movement 5 or 8 times to do so.
Isometrics are another training tool in your "Exercise Tool Box". It is an effective tool for those who know how to use it.
However, the majority of individuals never use it.
Is it because it is easier to quantify "I lifted this much weight, this many times" vs "I pushed on a wall as hard as a could for 10 seconds"?. I know that isn't all isometric workouts consist of but you get the idea.
Yes. It primarily male ego thing.
Even holding a box you have lifted and moving it is more similar to isometric just holding a deadlift after you have lifted it...but I never really see any isometric-type work being done by most people.
The reason is as I noted and you stated above.
Also...are explosive movements (Olympic style maneuvers and whatnot) easier to get into the "overtraining" zone than the previous two?
No. Olympic movements basically are concentric contractions that eliminate the eccentric part of the the movement which causes the greatest muscle trauma.
There is no eccentric action with Isometrics, either.
While you can overtrain with any method, it less likely.
I don't do very high volume workouts but since I have included some power type exercises, along with sprints, I tend to get into the cranky, I don't have the energy to workout stage.Overtraining
You statement indicates you are in the early stages of overtraining.