In a recent study of 526 women and men, researchers found that those who were the most flexible on a sit-and-reach test also had the most supple arteries, as measured by a pulse-wave pressure test.

But we also know there are some devices for measuring pulse wave velocity over the aorta, between carotid and femoral artery.

The measuring function of short persistence oscillograph can be extended by adding pulse wave collecting circuit and signal processing circuit.