I'm really decue this product. Both the pulse is just as much a 3mn interval, systole does not correspond to anything. I am sporty and no particular problem and when I operated the Duronic I get to 21 voltage .... In the hospital for medical examination of my hut level I 11.7 I do not understand why it forms part between 19 and 21 or 23 of systole ... there really was a problem with the Duronic