http://www.bioenergimed.com Heart Rate Variability (HRV) excerpt from a lecture by Dr. Jeffrey Marrongelle. HRV is a window to look at the control and coordination of the autonomic nervous system by observing that control directly on the heart rate under various states of stress. This technology is based on the assessment of the RR wave interval derived from ECG. Dr. Marrongelle is one of the world’s leading experts on HRV technology. He has given dozens lectures to international audiences and practitioners in addition to administering over 12,000 HRV exams. To learn more about HRV and other health technology and products, visit http://www.bioenergimed.com