. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . zing contraction is continued for some time, relaxation or seda-tion takes place. This has been thought by some to be due to musclefatigue, others^ believe it to be due either to some sort of inhibitoryaction or to contracting the bloodvessels so that an anemic conditionis produced in the nerve and muscle and hence impaired function. It can be demonstrated that, as in the case of the galvanic current, thekathode is here also more efficient in producing contractions. Owingto the fact that the faradi
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . zing contraction is continued for some time, relaxation or seda-tion takes place. This has been thought by some to be due to musclefatigue, others^ believe it to be due either to some sort of inhibitoryaction or to contracting the bloodvessels so that an anemic conditionis produced in the nerve and muscle and hence impaired function. It can be demonstrated that, as in the case of the galvanic current, thekathode is here also more efficient in producing contractions. Owingto the fact that the faradic current is an alternating current, it mightbe supposed that there is no constant positive and negative pole. Whenthe current from the secondary coil is employed, this is the case, but thecurrent of break is of greater intensity and hence greater physiologicalactivity, and is the current meant when the polarity of the faradiccurrent is considered. As the extra current from the primary coil, asas has been shown on page 90, practically only occurs at break, thesame rule applies to it. Fig. 93. De Watteville combiner, to which ia added a to the negative pole. imutator, with index pointing Physiological Action of the Combined Galvanic and Faradic Currents.—Tlie action of both currents may be obtained at the same time by meansof a suitable switch (Fig. 93), or, if not at hand, by the following method:If the negative pole is to be attached to the indifferent electrode (p. 201)and the positive to the active, the negative cord of the galvanic batteryis carried direct to the indifferent electrode and the positive cord ofthe galvanic current is carried to the negative post of the faradic battery. 1 Journal of Advanced Therapeutics, November, 1909, p. 538 et seq. 124 THE HUMAN BODY AS A CONDUCTOR OF ELECTRICITY To the positive pole of the faradic battery a cord is attached, whichbecomes the combined positive of both currents, and is to be carriedthrough the meter and controller before
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