Keith Livingstone The Cardiovascular Machine
Автор: Hitsystem
Загружено: 2020-11-01
Просмотров: 1053
Описание: Keith talks about how the cardiovascular ‘pump’ is best-developed with much lower intensities than many coaches and athletes would think. The heart is essentially the ultimate ‘slow twitch ‘muscle fibre; it has never stopped beating since you were two weeks old in utero. It will only work efficiently as a pump if the filling chambers of the heart, the atria, are effectively filled at a rate that is just slow enough to ensure the maximal inflow of blood, and then the pumping chambers, the muscular ventricles, needed to be fully stretched, like Spandex, to maximal tension by a decent volume of blood before contracting maximally as well. This stretch reflex mechanism and the muscular tension it creates which eventually leads to a very large ventricular capacity and greatly increased oxygen uptake is called the Frank-Starling mechanism.
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