Fitness Model, Rob Riches, claims that doing bicep curls with Olympic bars is different than lifting with normal bars.

Biceps have always been a favorite muscle group of mine to train, but since IA????1ve started using the Olympic bar to curl with, IA????1m noticing my arms start to thicken out, where as before they had good size from the side view, but when viewed from straight on, I felt as though they lacked the width I should have in them.

Source

Normal barbell curl (short)

barbell curl

Olympic barbell curl (long)

olympic barbell curl

Does Rob Riches’ tip make sense when explained with physics? Let’s take two barbells. The first barbell is an Olympic barbell loaded to a total of 60 lbs. The second barbell is a normal length barbell at 60 lbs as well. How would the force on the biceps differ when lifting these two different length but identical weight barbells? I don’t see how the biceps would feel any difference.