Efeito da corrente interferencial, 2000Hz, no limiar de dor induzida

Abstract

This study aimed at evaluating how effective an interferential current is on pain reduction concerning a painful stimulus, under pressure and cold, in healthy subjects. It was applied a bipolar technique on the nerve root. Fourteen volunteers made part of this study and were divided into two groups. On the first day, one group was submitted to the interferential current, while the other did not have such procedure. On the next day, the groups were exchanged. The pain pressure and cold thresholds were evaluated by an algometer device as well as to discomfort by the Visual Analogue Scale (VAS). The interferential current was used as a form of electrical stimulation with the following parameters: 2000 Hz current base, with AMF 100 Hz, ΔF 50%, slope 1/1. The subjects were reevaluated on three occasions: immediately after; 20 minutes and one hour after stimulation. The results of comparison between evaluations with the pressure algometer and discomfort to cold were not significant, neither in the placebo group not the stimulated one. There was decrease on evaluations for the stimulated group concerning pain to cold. Therefore, it was concluded that there was no change in pain to pressure or discomfort to cold based on the interferential current application with the used parameters produced, but lower pain to cold was produced.

Influence of different frequencies of transcutaneous electrical nerve stimulation on the threshold and pain intensity in young subjects

“…The volunteers were explained that the pain would be evaluated by means of a pressure stimulation technique, and the individual should report the moment he/she felt it. ( 11 ) Assessment with the pressure algometer was made by only one evaluator, and the device was used with a metallic tapered-end stem in the hypothenar region, 3cm from the wrist fold, with gradual vertical pressure, until the volunteer reported the word “pain”. After measuring, the Kgf force necessary to produce the painful stimulus in each individual was noted (AV1).…”

“…Next, the participant was told to remove the limb from the cold water and to mark the intensity of pain on a Visual Analog Scale (VAS) of Pain. ( 11 )…”

“…Foi explicado aos voluntários que a dor seria avaliada por meio de uma técnica de estimulação por pressão, e o indivíduo deveria relatar o momento em que começava a senti-la. ( 11 ) A avaliação com o algômetro de pressão foi feita por apenas um avaliador, e o aparelho foi utilizado com uma haste metálica com ponta afilada, pressionando na região hipotenar, 3cm a partir da prega proximal do punho, com pressão gradual, vertical, até o voluntário relatar a palavra “dor”. Após a mensuração, foi anotada a força em Kgf necessária para ocorrer o estímulo doloroso em cada indivíduo (AV1).…”

“…Passado esse tempo, pediu-se para que o indivíduo retirasse o membro da água gelada e marcasse a intensidade álgica em uma Escala Visual Analógica de Dor (EVAD). ( 11 )…”

Immediate analgesic effect of 2KHz interferential current in chronic low back pain: randomized clinical trial

“…This result is reinforced by Corrêa et al 12 , who found more significant effects on the immediate reduction of pain after IC application with lower frequencies (1KHz), and also by Fuentes et al 20 who found satisfactory results of IC in relation to placebo, but did not indicate the CF used, only the frequency modulation of 0Hz. Only the study by Pereira et al 31 evaluated the IC immediate effects in the frequency of 2KHz and found no significant results in changing the pain threshold for cold and heat. However, this study evaluated healthy individuals and not CLBP ones.…”