Backer_MigraineHRV_2007
I am posting this older article so that I can link to it on an upcoming handout for the UCSF presentation on Wednesday  November 26th.  Interestingly, what they see is that LF decreases over time in the verum acupuncture group.
Acupuncture in migraine: investigation of autonomic effects Bäcker M, Grossman P, Schneider J, Michalsen A, Knoblauch N, Tan L, Niggemeyer C, Linde K, Melchart D, Dobos GJ Clin J Pain. 2008 Feb;24(2):106-15.