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A Study, on the Threshold in Sensation of Pain [1] : Pain in Depth Shyoichi Sadakata 1 1Department of Surgery, Faculty of Medicine, Tohoku University pp.566-570
Published Date 1957/9/1
DOI https://doi.org/10.11477/mf.1406200604
  • Abstract
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Using coiled spring esthesiometer which was made by the author, length 30 cm., weight 110 gm., pain threshhold was measu-red. The force exerted on the tissue by the rounded ebonite tip of the plunger, 10mm in diameter, was read from a scale which indi-cated the degree of compression of the steel spring. The pain threshold measurements were obtained by placing the plunger tip upon the forehead and increasing the pressure (1 kg./5minutes) until the subject reported pain. Every effort was made to direct the plunger perpendicular to the calvarium, thus to avoid dragging or pulling the skin.

From the experiments of 0.05% percamine injection, it was inferred that the subcutaneous and periosteal tissues were the primary sites of noxious stimulation.. Pain threshold was found to be relatively stabilized on the fore-head, and its mean pressure which required to evoke pain in 66 adult subjects was O.58kg. Noticeable differences on five trained adult subjects showed the same results with Hardy's apparatus.

Experiments on the influence of skin tem-perature were performed on 10 trained adult subjects.


Copyright © 1957, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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