Question about DB bicep curls

[sparrow]

I've seen some people do alternating DB bicep curls up the their shoulders.
And others bring the DB up to waist level, then back down.

Any difference/advantage/disadvantage to these two ways?

thanks

[swanso5]

just variation really...you'll feel during db curls that there is no tension once your arms passes by 90 degrees so really it's a waste so haklf curls or 3/4 curls are probably more efficient although if you do them with cables you'll get the most tension at the top position