Augmentation of electrical conduction and contractility by biphasic stimulation of muscle tissue. A first stimulation phase has a first phase polarity, amplitude, and duration. The first stimulation phase, which acts as a conditioning mechanism, is administered at no more than a maximum subthreshold...http://www.google.com/patents/US6343232?utm_source=gb-gplus-sharePatent US6343232 - Augmentation of muscle contractility by biphasic stimulation
