Basic Study of Strength-Duration Curve in Magnetic Stimulation:-Using an Experimental Eddy Current Waveform-

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There is increasing interest in the use of magnetic stimulation as a modality for clinical examination and therapy. It is desirable that the eddy current density produced by a change in the strength of a magnetic field should be greater than the excitability threshold of the muscles or nerves to be stimulated. Magnetic stimulation for clinical use has two advantages over electrical stimulation: 1) It can be carried out non-invasively without the need for skin-surface electrodes, and 2) the removal of the patient's clothing is not required. However, effective magnetic stimulation requires the input of a high current into the stimulation coil. The requisite equipment is therefore large and costly. It is necessary to develop magnetic stimulators that are more efficient in stimulating tissues and more convenient to use than those presently available. The eddy current waveform differs from the rectangular current waveform common in electrical applications. Basic studies on the effects of magnetic stimulation on threshold values and other aspects of eddy current waveforms have not been conducted. In this study, the authors attempted to measure the strength-duration curve (S-D curve) of eddy currents on the sural muscle of the bullfrog and propose a new S-D curve formula for eddy currents in place of Weiss's equation for rectangular current waveforms.
一般社団法人日本生体医工学会の論文