When performing lateral raises with the arm raised exactly 90 degrees, dumbbells and cables produce the same amount of muscle growth, even though they apply resistance differently.

We analyzed the available evidence on whether dumbbells and cables build the same muscle during 90-degree lateral raises, and what we’ve found so far suggests they produce similar muscle growth at that specific angle [1]. Both tools apply resistance in different ways—dumbbells rely on gravity, while cables maintain tension through the cable’s path—but the evidence we’ve reviewed does not show a meaningful difference in muscle-building outcomes when the arm is raised exactly 90 degrees [1]. This doesn’t mean one is better or worse. It means that, at this exact joint position, the body responds similarly regardless of the equipment used. The number of studies supporting this is limited—only one assertion was analyzed—but it was supported without any refuting evidence. We don’t know how this compares to other angles, like 30 or 60 degrees, or whether long-term results differ over months or years. We also don’t know if individual differences in strength, form, or muscle activation play a role. What we’ve found so far is narrow in scope: just one claim, focused on one position, with no data on volume, frequency, or recovery. The evidence doesn’t tell us if one tool is easier to control, safer, or more comfortable. It only points to similar muscle growth at 90 degrees. For someone doing lateral raises, this means you can choose dumbbells or cables based on preference, equipment access, or how it feels in your shoulders—not because one is scientifically proven to build more muscle at that angle.