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Updated: June 17, 2025
Now let anyone make an experiment upon the arm of a man, either using such a fillet as is employed in blood-letting, or grasping the limb lightly with his hand, the best subject for it being one who is lean, and who has large veins, and the best time after exercise, when the body is warm, the pulse is full, and the blood carried in larger quantity to the extremities, for all then is more conspicuous; under such circumstances let a ligature be thrown about the extremity, and drawn as tightly as can be borne, it will first be perceived that beyond the ligature, neither in the wrist nor anywhere else, do the arteries pulsate, at the same time that immediately above the ligature the artery begins to rise higher at each diastole, to throb mere violently, and to swell in its vicinity with a kind of tide, as if it strove to break through and overcome the obstacle to its current; the artery here, in short, appears as if it were preternaturally full.
He believes that the important factors in the estimation of the circulatory strength are the systolic pressure, which shows the power of the left ventricle, the diastolic pressure, which shows the intravascular tension during diastole as well as the peripheral resistance, and the pulse rate, which designates the number of times the heart must contract during a minute to maintain the proper flow of blood.
He watched his mood. And thus in all Macaulay's "Essays" we feel the systole and diastole, and the hot, strong, impatient movement of ruddy life. There is "go" in every sentence. This is what constitutes his marvelous style life, life, life! To very few men, indeed, is it given to be at once a brilliant talker, a strong writer and an effective orator.
London, that immense heart, with its systole and diastole, its ebb and flow and putrefying growth, lay beating behind me. Ahead lay that grey, brooding North, that vast coal-field whose output had made us masters of the world. Take it how you will, you must have roads. That is America's need to day roads. Without roads no art, no literature, no real progress. No canals or railroads will do.
For when Goethe speaks of systole and diastole, as the plant first taught him to see them and as later he found them forming the basic factors of weather-formation, he is really speaking of the ancient concepts, 'cold' and 'warm'. Goethe's way of observing nature is, in fact, a first step beyond the limits of a science which kept itself ignorant of levity as a cosmic counterpart to terrestrial gravity.
A troop train was speeding north and a hospital train crawling south, their coming and going betrayed only to the ear, for they showed no lights. The one was freighted with youth, health, life; the other with pain, wounds, death. It was the systole and diastole of the Base.
There must be a true equilibrium between what we eat and what we reject again by excretion: likewise between the systole and diastole of the heart, the inspiration and expiration of our breathing. Suffice to say the equilibrium is never quite perfect. Most people are either too fat or too thin, too hot or too cold, too slow or too quick. There is no such thing as an actual norm, a living norm.
The short downward curve from the apex means relaxation of the auricle. The second lesser rise, called the carotid wave, is believed to be due to the impact of the sudden expansion of the carotid artery. The drop of the wave tracing after this cartoid rise is due to the auricular diastole.
No one, before his time, conceived that the movement of the blood was entirely due to the mechanical action of the heart as a pump. There were all sorts of speculations about the matter, but nobody had formed this conception, and nobody understood that the so-called systole of the heart is a state of active contraction, and the so-called diastole is a mere passive dilatation.
Like the systole and diastole of a slowly beating pulse, the word kept on forming in his mind and welling away in a tide of confused and amorphous scenes; and forming again; and again oozing in presentments of speculations, scenes, surmises, and in profound disturbances of strange emotions. War.... And there kept appearing the face of Otway with the little points of perspiration about his nose.
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