This note is primarily intended to strengthen the priority of clinical and epidemiological studies of Manuel Marín Barrantes; and merely "preliminary" nature of this note clearly states not to invade the originality of its thesis.

In our previous communications we have concluded the tendency to bradycardia and acceleration discrete reactions to the effort in populated highlands of Peru. Also we did see the heart of the Andean supranormal value judged by its cardiovascular response. In order to express the fact that this bradycardic brake even in newcomers appeared, allowed to assume the intervention of the autonomic nervous system in regulating heart of man in heaven.

The pulse was one element that was first observed on trips to great heights. It has sought to establish a relationship between height and pulse rate while this was studied during the trip. At present - where effortless ascents or airplane - it is shown that such an event, but under certain conditions of rarefied air. We can say, as a result of our observations, this frequency is relatively moderate and only when signs appear normal Soroche to appear more or less intense tachycardia rhythm breaks.

In the previous communication we had necessarily refer to the performance of the heart against the effort to determine the frequency characteristics, shape, stability, etc., constituting man's pulse rate of the Andes. Indeed, we have noted the frequency of bradycardic and ortocárdicas reactions which are undoubtedly the best example of the physiological assessment of the Andean heart. So we said that the law of the Andean heart versus moderate or large effort, it is not a straight line as they occur at sea level - equal acceleration effort - but at the expense of the creek ortobradicárdicas reactions slowed to acceleration.