Effect of using jelly-type protector for nail on throwing performance

Abstract

The purpose of this study was to reveal the effects of using the jelly-type protector on the gripping force and the performance in ball-throwing. The nail works to catch the force from given the finger pad and plays the important role of physical exercise. However, the nail problems such as flat nails and spoon nails have been reported in these days, so that it is necessary for the approach to prevent them. It seems that a jelly coat on the fingernails qualitatively affects the gripping force. From the above, we measured the relationship between the fingernails strain and the gripping force with 3 conditions (no-jell, 3layered jell and 5layered jell on their fingers of their dominant hands). In this study, bidirectional strain gauges are mounted on radial and ulnar side of each finger and gripping force sensor were made for acquiring the gripping force in each finger. As a result, it was apparent that the jelly-type protector decreased the strain of fingernails by making a multilayer on it.