Why do muscles respond differently to range of motion in strength training?
What the Evidence Shows
What we've found so far is that muscles may not all respond the same way to different ranges of motion during strength training. Our analysis of the available research suggests that some muscles might benefit more from larger movements than others [1].
We looked at one assertion from the evidence, and it supports the idea that not every muscle grows best with the same type of movement. This means that doing the same kind of lift—like always using full or partial reps—might not be the best approach for every muscle group . The evidence we've reviewed leans toward the idea that muscle response can vary depending on the range of motion used, but we don’t yet know which muscles respond best to which types of movement.
Right now, we don’t have enough studies to say how exactly each muscle reacts, or why some might need bigger movements to grow. There’s only one assertion in our analysis so far, and no studies that refute it, but that doesn’t mean it’s true for everyone or every muscle. Our current analysis is limited, and what we’re seeing could change as we review more evidence over time.
We can’t draw firm conclusions yet. The idea makes sense—if muscles have different shapes, attachments, and roles in movement, then they might respond differently to different ranges of motion—but we don’t have enough data to map it out.
Practical takeaway: It might be worth trying different types of movements—some with big ranges, some more focused—to see what works best for different muscles. But we’re still learning, and what we know now could shift as more research becomes available.