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Yeah, there is definitely a difference when going from dumbbell to barbell and vice versa, and I do believe that it is because of the stabilizing factor. And it appears to depend on what kind of muscles you're working as to the amount of weight increase/decrease when changing from dumbbells to barbells. For instance, when doing bicep curls it stays nearly the same because you don't have to stabilize the dumbbells anymore for the curl than you would the barbell. However, when doing the bench press it requires more stabilizing muscles to hold the dumbbell above you than to hold a barbell that is also being supported by the other arm. And so a barbell bench press will usually use higher poundage than the dumbbell bench press.
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