I remembered this experience when I read by chance in the comments of this book that term cardiac coherence was linked to breathing exercises, so I was immediately interested. I explain the basic idea of the book. By breathing to the rhythm of inspiration and 5 seconds per 5 seconds per expiration, focusing on breathing (we guess that there is difficulty), a link occurs with the sympathetic and parasympathetic systems. There has favorable effects for several hours not only on stress, anxiety or depression, but also on other health items (see from p. 38), which attenuates ( hopefully!) some effects of aging. When the effects are over, you have to start (4 or 6 hours).
Dr O'Hare advises three sessions per day, the most important being that morning, at the rate of 5 minutes each time. I tried for about two and a half months and I've waited for this time to tell others about my experience. At first it is difficult to subject themselves to this exercise, not least because we are not sure it will be used for something. But soon I felt the effects. First, there certainly has psychological effects. In my case, I had the impression of having more enthusiasm, even for boring tasks, a certain indifference to unpleasant sensations, perhaps a more cordial and diplomatic attitude in society and I say with caution because self-suggestion plays its role, a slight improvement in both conditions. This does not delete mood changes depending on the day, but I can conclude that true efficiency. If I had been depressed or stressed by overwork, the result might have been even more spectacular. Although I can not imagine a real depressive able to submit to this effort, except in institutions.
I do not know if the book brings something from those of David Servan-Schreiber, I have not read and whose author is referring to the work (according to some commentators, there is nothing new) . This little book is clear and accessible, with a personal style (puns based on etymologies), but it has a flaw. As the matter was a bit insufficient to make a real self, the author diluted, was repeated. Paradoxically, he speaks of scientific studies that confirm the value of the technique, but it says nothing as he had instead. Now if only for unbelievers, it might have been useful to give some details ...
