Journal of the Korean Society of Physical Medicine (대한물리의학회지)

The Korean Society of Physical Medicine (대한물리의학회)
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The Immediate Effects of 975-nm GaAlAs Low-level Laser Therapy on Myofacial Triger Point of Upper Trapezius Muscle in Subjects with Rounded Shoulder Posture

둥근 어깨 자세를 가진 자의 등세모근 위 섬유의 압통점에 975-nm GaAlAs 저출력레이저 적용에 대한 즉각적인 효과

  • Kim, Byeong-Jo (Department of Physical Therapy, College of Nursing and Healthcare Sciences, Dong-Eui University) ;
  • Lee, Jung-Hoon (Department of Physical Therapy, College of Nursing and Healthcare Sciences, Dong-Eui University)
  • 김병조 (동의대학교 의료보건대학 물리치료학과) ;
  • 이정훈 (동의대학교 의료보건대학 물리치료학과)
  • Received : 2014.10.10
  • Accepted : 2014.10.30
  • Published : 2014.11.30
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Abstract

PURPOSE: The purpose of our study was to compare a 975-nm, 500-mW GaAlAs low-level laser therapy versus placebo low-level laser therapy with regard to the immediate changes on the myofascial trigger point of the dominant upper trapezius muscle in subjects with rounded shoulder posture. METHODS: Thirty-two male college students with rounded shoulder posture and shoulder pain consented to participate in the experiment. The subjects were randomly assigned to a 2-minute procedure with either an active GaAlAs low-level laser or a placebo GaAlAs low-level laser. The pressure-pain threshold and visual analog scale on tenderness at 3 kg were measured with an algometer before and after the laser treatments. RESULTS: The active GaAlAs low-level laser group showed significant changes in pressure-pain threshold and visual analog scale on tenderness at 3 kg (p<0.05). The placebo GaAlAs low-level laser group showed no significant changes in either pressure-pain threshold or visual analog scale on tenderness at 3 kg (p>0.05). CONCLUSION: An immediate effect was observed in pressure-pain threshold and visual analog scale on tenderness at 3 kg following a 2-minute application ($857.14J/cm^2$) of a 975-nm, 500-mW GaAlAs low-level laser to the myofascial trigger point of the dominant upper trapezius muscle in patients with rounded shoulder posture.

Keywords

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