Wang Zhiyu, Xia Jinshan (Shanghai Institute of traditional Chinese medicine)
The problem that certain waveform, amplitude and frequency of electroacupuncture have the best analgesic effect needs to be resolved clinically, since varieties of electroacupuncture instruments are now in use. The purpose of this study, therefore, was to explore the effective electroacupuncture parameters for analgesia. White rats were used in the study.
The voltage, waveform and frequency from these instruments can be principally devided into 3 major sorts: (1), the regular pulse, (2), The regular-changed pulse of frequency modulation or amplitude modulation, (3), The entirely irregular electric wave, for example the wave of producing noise and music. In these three major sorts, nine electroacupuncture paramaters were used in this experiment. In the first, major sort, diphasic spike pulse with three different frequencies, 1,47 and 1120 Hz. represented the first, second and third electroacupuncture parameters. In the second sort, three frequncies 1, 47 and 1098 Hz modulated to 43, 1472 and 6540 Hz respectively and regularly represented the fourth, fifth and sixth parameters. In the third major sort, the mixed waves of 1Hz diphasic spike pulse in the electric waves of producing noise and music and 1148 Hz diphasic spike pulse mixed in musical wave represented the seventh, eighth and ninth parameters. 36 white rats were devided into 9 groups, and each group of four rats was respectively given electrical acupuncture twice with dissimilar parameters. The voltage was 4 V peak to peak. There was 1-2 day interval between two times. The duration of the stimulation was 30 minutes each time. Pain of the animals was detected by burning their tails with heated electrothermal coil at 5,10,20 and 30-minutes before and after the electroacupuncture. The duration in seconds from the beginning of heating to turning tails of the animals served as their pain reaction value. The site of needling was in correspondence to the point of "Chengshan" in the human body.
It was observed that, through this study, the analgesic effect of the electroacupuncture parameters of the third sort was the best, those of the second was good, but those of the first was the worst. Among the parameters of the third sort, the eighth parameters was the best, the seventh was next to it, and the ninth was not so good as the other parameters. Generally; electroacupuncture with effective parameters for 5 minutes would induce analgesia. This analgesic effect would be diminished if the voltage, one of these parameters, decreased to 2V. The effect could not be compensated even if the duration of electro-acupuncture would be prolonged or the frequency speeded up.
The problem that certain waveform, amplitude and frequency of electroacupuncture have the best analgesic effect needs to be resolved clinically, since varieties of electroacupuncture instruments are now in use. The purpose of this study, therefore, was to explore the effective electroacupuncture parameters for analgesia. White rats were used in the study.
The voltage, waveform and frequency from these instruments can be principally devided into 3 major sorts: (1), the regular pulse, (2), The regular-changed pulse of frequency modulation or amplitude modulation, (3), The entirely irregular electric wave, for example the wave of producing noise and music. In these three major sorts, nine electroacupuncture paramaters were used in this experiment. In the first, major sort, diphasic spike pulse with three different frequencies, 1,47 and 1120 Hz. represented the first, second and third electroacupuncture parameters. In the second sort, three frequncies 1, 47 and 1098 Hz modulated to 43, 1472 and 6540 Hz respectively and regularly represented the fourth, fifth and sixth parameters. In the third major sort, the mixed waves of 1Hz diphasic spike pulse in the electric waves of producing noise and music and 1148 Hz diphasic spike pulse mixed in musical wave represented the seventh, eighth and ninth parameters. 36 white rats were devided into 9 groups, and each group of four rats was respectively given electrical acupuncture twice with dissimilar parameters. The voltage was 4 V peak to peak. There was 1-2 day interval between two times. The duration of the stimulation was 30 minutes each time. Pain of the animals was detected by burning their tails with heated electrothermal coil at 5,10,20 and 30-minutes before and after the electroacupuncture. The duration in seconds from the beginning of heating to turning tails of the animals served as their pain reaction value. The site of needling was in correspondence to the point of "Chengshan" in the human body.
It was observed that, through this study, the analgesic effect of the electroacupuncture parameters of the third sort was the best, those of the second was good, but those of the first was the worst. Among the parameters of the third sort, the eighth parameters was the best, the seventh was next to it, and the ninth was not so good as the other parameters. Generally; electroacupuncture with effective parameters for 5 minutes would induce analgesia. This analgesic effect would be diminished if the voltage, one of these parameters, decreased to 2V. The effect could not be compensated even if the duration of electro-acupuncture would be prolonged or the frequency speeded up.
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