found an interesting article/study that was done between a shake weight and a normal dumbbell. looks pretty credible and had some good information on it.
http://www.worldofdiets.com/wp-content/uploads/2010/03/Fitness-IQ-Report_MALE_With-Table.pdf
It was made in december of 2009 and is about:
This report details the analysis preformed using LifeMOD to compare muscular reactions for the Shake Weight and a normal dumbbell curl exercise.
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