systole

systole puhekieltä The rhythmic contraction of the heart, by which blood is driven through the arteries.
1972, Vladimir Nabokov, Transparent Things, McGraw-Hill 1972, pp. 78-9:

A double systole catapulted him into full consciousness again, and he promised his uncorrected self that he would limit his daily ration of cigarettes to a couple of heartbeats.

There is no essential virtue in comfort. To be relaxed is good if it is part of a process of systole and diastole. Relaxation comes between phases of tenseness.