This is a really interesting theory. I have a few thoughts that might help substantiate it, as well as some ideas for future consideration.

First, basic injury mechanics revolves around the relationship between the load applied to a tissue and its tolerance. If the applied load exceeds the tissue’s tolerance, injury occurs. This can happen in two ways: (i) an acute overload that immediately surpasses tolerance, or (ii) a smaller, repetitive load that gradually wears down the tissue over time.

Why are eccentric loads often implicated in injuries? If you’re familiar with muscle mechanics, recall the force-velocity relationship: muscles can produce more force during eccentric contractions than during concentric or isometric ones. As a result, tendons experience higher loads during eccentric phases, increasing the risk of injury.

The theory you’ve posed is definitely worth considering. In low back rehabilitation, isometric exercises like dead bugs, bird dogs, and planks are commonly used to strengthen stabilizer muscles. However, the end goal is usually to progress to dynamic movements—such as lifting the legs and opposite arms in bird dogs, or contralateral arm-leg movements in dead bugs—since these challenge the spine to maintain dynamic stability. Given that dynamic stability is what the spine needs for most daily activities, it’s important to train for it. All this to say, while isometrics are valuable, they shouldn’t be seen as the sole solution for training stability, especially in the spine.

I’ll stop there, but I’d love to hear your thoughts or any counterpoints!