If you take a minute to read the information available http://www.choosemuse.com/pages/faq#using http://www.choosemuse.com/pages/faq#using says that there is

If you take a minute to read the information available http://www.choosemuse.com/pages/faq#using http://www.choosemuse.com/pages/faq#using says that there is a 1 minute calibration period at the beginning of each use.