Journal of Oral Medicine and Pain

Korean Academy of Orofacial Pain and Oral Medicine (대한안면통증구강내과학회)
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The Effects of Transcutaneous Electric Nerve Stimulation (TENS) on the EMG Power Spectrum and Pressure Pain Threshold (PPT)

경피성 신경자극이 근전도 Power Spectrum과 압력통각역치에 미치는 영향

  • Kim, Cheul (Department of Oral Medicine and Diagnosis & Research Institute of Oral Science College of Dentistry, Kangnung National University) ;
  • Park, Moon-Soo (Department of Oral Medicine and Diagnosis & Research Institute of Oral Science College of Dentistry, Kangnung National University)
  • 김철 (강릉대학교 치과대학 구강내과.진단학 교실 및 구강과학연구소) ;
  • 박문수 (강릉대학교 치과대학 구강내과.진단학 교실 및 구강과학연구소)
  • Published : 2007.12.30
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Abstract

This investigation was carried out to evaluate the effect of Transcutaneous Electric Nerve Stimulation (TENS) to experimentally induced masticatory muscle pain and muscular fatigue. Twenty-nine healthy volunteers (18 men and 11 women, aged $26.1{\pm}4.7$ years) without past history or present symptoms of temporomandibular disorders were participated in this study. All of the subjects were randomly assigned to experimental group and control group, after at least 3 days interval, two groups were reassigned conversely. Subjects assigned to experimental group were received TENS and others assigned to control group were received sham-TENS therapy for 45 minutes, respectively. The changes of Visual Analogue Scale (VAS), Pressure Pain Threshold (PPT), and EMG power spectrum were measured on the masseter muscle both before and after sustained fatiguing contraction in each group. The major findings of this study are as follows : 1. PPTs and median frequencies of masseter muscles were significantly decreased after sustained isometric contraction resulting in muscular fatigue. 2. In experimental group received TENS therapy, PPTs measured both before and after occurrence of experimentally induced muscular fatigue were significantly increased. 3. In experimental group received TENS therapy, the changes of PPTs during sustained isometric contraction resulting in muscular fatigue were significantly decreased. 4. In experimental group received TENS therapy, VAS measured after occurrence of experimentally induced muscular fatigue was significantly decreased. 5. Although there were not statistical significances, endurance time was increased in experimental group received TENS therapy and decreased in control group received sham-TENS therapy. 6. In experimental group received TENS therapy, the changes of median frequencies were the less decreased and the slope of median frequency shift was the more increased during endurance time than in control group, however, there were not statistical significances.

본 연구는 저작근의 과활성으로 유발된 근피로와 근육통증에 경피성 신경자극이 어떤 영향을 미치는지 평가하기 위해 측두하악장애의 병력과 현증이 없는 평균연령 26.1세인 29명의 정상 성인 (남자 18명, 여자 11명)을 대상으로 교근의 주관적 통증강도, 압력통각역치, 근전도 power spectrum의 변화양상을 측정하여 분석하였다. 모든 피험자는 적어도 3일 이상의 간격으로 2 회의 실험에 참여하여 하루는 실험군으로서 경피성 신경자극(TENS)을 적용하였고, 다른 하루는 대조군으로서 위경피성 신경자극(sham-TENS)을 적용하였다. 실험군과 대조군에서 각각 교근의 지속적인 등척성 수축 전과 후의 주관적 통증강도, 압력통각역치, 인내시간까지의 근수축 동안 근전도 power spectrum을 측정 분석하여 다음과 같은 결론을 얻었다. 1. 지속적인 등척성 수축으로 유발된 근피로 후의 압력통각역치와 중간주파수는 근피로 유발 전보다 유의하게 감소하였다. 2. 근피로 유발 전과 후의 압력통각역치는 TENS를 적용한 실험군에서 통계적으로 유의하게 증가하였다. 3. 근피로로 유발된 압력통각역치의 변화량은 TENS를 적용한 실험군에서 유의하게 감소하였다. 4. 근피로 후의 주관적 통증강도는 TENS를 적용한 실험군에서 유의하게 감소하였다. 5. 인내시간은 TENS를 적용한 실험군에서 증가하였고, sham-TENS를 적용한 대조군에서는 감소하였으나, 모두 통계적 유의성은 나타나지 않았다. 6. 인내시간 동안 중간주파수 변화량은 TENS를 적용한 실험군에서 더욱 적게 감소하였고 중간주파수 변화의 기울기는 더욱 크게 증가하였으나 모두 통계적 유의성은 나타나지 않았다.

Keywords

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