Here is a link. Not sure if its the same study but seems to be a study on this matter. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2906692/
I had a basic 15 minute left arm acupuncture treatment in the morning and noticed improvement and spasmsi had tonight are less painful. Just a 2 out of 10 as opposed to over 5-6.