Abstract
In order to explain the relationship between “pinch” and nail, a sphygmograph was used for measuring blood flow changes in a nail while pinching several weight, and frequency characteristics of sphygmogram were analyzed by continuous wavelet transform(CWT). From the results of CWT, frequency components (1-4Hz) were increased as compared with sphygmogram without weights. This indicates a blood flow fluctuation caused by the stimulation of tactile receptors in the nail bed.
