When one sits with the legs crossed there is an almost invisible but natural swing of the foot that is synchronous with each heartbeat. If one attaches a short rod1 to the side of the shoe of an individual sitting thus and lets the pointed tip of this rod rest lightly against the revolving drum of a sphygmograph, one will get a normal reading such as those in figures 1 to 5.
These graphs, as will be noted, show a dicrotic wave and correspond very closely to the sphygmogram tracings of the radial artery. There are slight variations, as one would expect, and many more control readings will have to be taken in order to get a clear idea as to just what they are and what they mean. They are being taken right along and there will be more to say on the matter later. Cardiac conditions and other factors
Bernheim BM. GRAPHIC METHOD OF INTERPRETING BLOOD VESSEL DISEASE OF THE LEGS: PRELIMINARY REPORT. JAMA. 1935;104(12):994–996. doi:10.1001/jama.1935.92760120001009
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