Rational hydrotherapy : a manual of the physiological and therapeutic effects of hydriatic procedures, and the technique of their application in the treatment of disease . 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 t
Rational hydrotherapy : a manual of the physiological and therapeutic effects of hydriatic procedures, and the technique of their application in the treatment of disease . 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 the factthat muscular activity increases heat produc-tion to so marked a degree that the cold application finds thethermogenic processes in full play, and hence more able toproduce a strong thermic reaction. 4:65 Warm or tepid baths (80° to 92°) do not produce the initial rise of temperature. The following diagram representsthe thermic action and reaction accompanying and followinga tepid bath. Modificationsof TliermicReaction. THE PHYSIOLOGICAL EFFECTS OF WATER. 137. II Diagram representing the vital rriovement following a warm or tepid bath. In this diagram, xx represents the normal temperature,° F. The line ad represents the action whereby thebody is cooled; the line dc, the reaction. The perpendiculardotted line is the point of division between the two classes ofphenomena. A tepid or neutral bath causes lowering of the body tern- 466perature purely in a physical and mechanical way, indepen-dently of any reflex action. The surface blood-vessels do notcontract, and hence the blood is rapidly cooled as it comes incontact with the water at a temperature a few degrees belowthe body temperature, and by the circulation of the bloodcurrent the internal temperature is lowered. Not infrequently the rise of body temperature produced by 467the thermic reaction after a cold bath does
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