Rational hydrotherapy : a manual of the physiological and therapeutic effects of hydriatic procedures, and the technique of their application in the treatment of disease . ic reaction. Thermic reaction to cold may be defined as the effort 461of the body to replace the heat which has been lost byexposure to cold, and to restore the equilibrium of the bodytemperature. All general cold applications of whatever sort, whether 462made to the skin or to the mucous membrane, lower both thetemperature of the surface to which they are applied, and theinternal or general temperature of the body. This has
Rational hydrotherapy : a manual of the physiological and therapeutic effects of hydriatic procedures, and the technique of their application in the treatment of disease . ic reaction. Thermic reaction to cold may be defined as the effort 461of the body to replace the heat which has been lost byexposure to cold, and to restore the equilibrium of the bodytemperature. All general cold applications of whatever sort, whether 462made to the skin or to the mucous membrane, lower both thetemperature of the surface to which they are applied, and theinternal or general temperature of the body. This has beenabundantly proved by Fleury, Liebermeister, Bottey, andothers. In a considerable proportion of the cases, however,the ultimate lowering of the internal temperature is precededby a slight rise, which begins almost simultaneously withthe cold application, and continues for lo or I2 minutesafterward. After the initial rise and subsequent lowering of the tem- 463perature, there is a gradual return to the normal tempera-ture. 13^ RATIONAL HYDROTHERAPY. This vital movement is very well shown in the fol-lowing diagram, which is modified from that given byBottey : —. Diagram indicating the vital movement following a general cold application. In this diagram, which represents the effect obtainedfrom a short, very cold jet douche or spray applied to theskin with high pressure, the line xx represents the normaltemperature, ° F.; the line ab represents the brief eleva-tion of internal temperature which follows the receding of theblood from the surface the first instant after a cold applica-tion; the line bed represents the fall in internal temperaturewhich immediately succeeds the rise; and the line de repre-sents the reaction by which the normal temperature is line abed may be said to represent the action which pre-cedes reaction. 464: Vigorous exercise or a hot bath taken just before a cold bath increases the initial rise oftemperature, which is doubtless due to
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