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The Effects of Transcutaneous Electric Nerve Stimulation (TENS) on the EMG Power Spectrum and Pressure Pain Threshold (PPT)

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±èö ( Kim Cheol ) - °­¸ª´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­³»°úÁø´ÜÇб³½Ç
¹Ú¹®¼ö ( Park Moon-Soo ) - °­¸ª´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­³»°úÁø´ÜÇб³½Ç

Abstract

º» ¿¬±¸´Â ÀúÀÛ±ÙÀÇ °úÈ°¼ºÀ¸·Î À¯¹ßµÈ ±ÙÇÇ·Î¿Í ±ÙÀ°ÅëÁõ¿¡ °æÇǼº ½Å°æÀÚ±ØÀÌ ¾î¶² ¿µÇâÀ» ¹ÌÄ¡´ÂÁö Æò°¡Çϱâ À§ÇØ ÃøµÎÇϾÇÀå¾ÖÀÇ º´·Â°ú ÇöÁõÀÌ ¾ø´Â Æò±Õ¿¬·É 26.1¼¼ÀÎ 29¸íÀÇ Á¤»ó ¼ºÀÎ (³²ÀÚ 18¸í, ¿©ÀÚ 11¸í)À» ´ë»óÀ¸·Î ±³±ÙÀÇ ÁÖ°üÀû ÅëÁõ°­µµ, ¾Ð·ÂÅë°¢¿ªÄ¡, ±ÙÀüµµ power spectrumÀÇ º¯È­¾ç»óÀ» ÃøÁ¤ÇÏ¿© ºÐ¼®ÇÏ¿´´Ù. ¸ðµç ÇÇÇèÀÚ´Â Àû¾îµµ 3ÀÏ ÀÌ»óÀÇ °£°ÝÀ¸·Î 2 ȸÀÇ ½ÇÇè¿¡ Âü¿©ÇÏ¿© ÇÏ·ç´Â ½ÇÇ豺À¸·Î¼­ °æÇǼº ½Å°æÀÚ±Ø(TENS)À» Àû¿ëÇÏ¿´°í, ´Ù¸¥ ÇÏ·ç´Â ´ëÁ¶±ºÀ¸·Î¼­ À§°æÇǼº ½Å°æÀÚ±Ø(sham-TENS)À» Àû¿ëÇÏ¿´´Ù. ½ÇÇ豺°ú ´ëÁ¶±º¿¡¼­ °¢°¢ ±³±ÙÀÇ Áö¼ÓÀûÀÎ µîô¼º ¼öÃà Àü°ú ÈÄÀÇ ÁÖ°üÀû ÅëÁõ°­µµ, ¾Ð·ÂÅë°¢¿ªÄ¡, Àγ»½Ã°£±îÁöÀÇ ±Ù¼öÃà µ¿¾È ±ÙÀüµµ power spectrumÀ» ÃøÁ¤ ºÐ¼®ÇÏ¿© ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù. 1. Áö¼ÓÀûÀÎ µîô¼º ¼öÃàÀ¸·Î À¯¹ßµÈ ±ÙÇÇ·Î ÈÄÀÇ ¾Ð·ÂÅë°¢¿ªÄ¡¿Í Áß°£ÁÖÆļö´Â ±ÙÇÇ·Î À¯¹ß Àüº¸´Ù À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´´Ù.
2. ±ÙÇÇ·Î À¯¹ß Àü°ú ÈÄÀÇ ¾Ð·ÂÅë°¢¿ªÄ¡´Â TENS¸¦ Àû¿ëÇÑ ½ÇÇ豺¿¡¼­ Åë°èÀûÀ¸·Î À¯ÀÇÇÏ°Ô Áõ°¡ÇÏ¿´´Ù.
3. ±ÙÇǷηΠÀ¯¹ßµÈ ¾Ð·ÂÅë°¢¿ªÄ¡ÀÇ º¯È­·®Àº TENS¸¦ Àû¿ëÇÑ ½ÇÇ豺¿¡¼­ À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´´Ù.
4. ±ÙÇÇ·Î ÈÄÀÇ ÁÖ°üÀû ÅëÁõ°­µµ´Â TENS¸¦ Àû¿ëÇÑ ½ÇÇ豺¿¡¼­ À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´´Ù.
5. Àγ»½Ã°£Àº TENS¸¦ Àû¿ëÇÑ ½ÇÇ豺¿¡¼­ Áõ°¡ÇÏ¿´°í, sham-TENS¸¦ Àû¿ëÇÑ ´ëÁ¶±º¿¡¼­´Â °¨¼ÒÇÏ¿´À¸³ª, ¸ðµÎ Åë°èÀû À¯ÀǼºÀº ³ªÅ¸³ªÁö ¾Ê¾Ò´Ù.
6. Àγ»½Ã°£ µ¿¾È Áß°£ÁÖÆļö º¯È­·®Àº TENS¸¦ Àû¿ëÇÑ ½ÇÇ豺¿¡¼­ ´õ¿í Àû°Ô °¨¼ÒÇÏ¿´°í Áß°£ÁÖÆļö º¯È­ÀÇ ±â¿ï±â´Â ´õ¿í Å©°Ô Áõ°¡ÇÏ¿´À¸³ª ¸ðµÎ Åë°èÀû À¯ÀǼºÀº ³ªÅ¸³ªÁö ¾Ê¾Ò´Ù.

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¡¾4.7 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.

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°æÇǼº ½Å°æÀÚ±Ø;±ÙÀ°ÅëÁõ;±ÙÀüµµ power spectrum;±ÙÇÇ·Î;¾Ð·ÂÅë°¢¿ªÄ¡;ÁÖ°üÀû ÅëÁõ°­µµ
EMG power spectrum;Masticatory muscle pain;Muscular fatigue;Pressure Pain Threshold;Transcutaneous Electric Nerve Stimulation;Visual Analogue Scale

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