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KMID : 1211620140090040433
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Journal of the Korean Society of Physical Medicine
2014 Volume.9 No. 4 p.433 ~ p.438
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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
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김병조:Kim Byeong-Jo
이정훈:Lee Jung-Hoon
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Abstract
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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 (857.14 J/cm2) 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.
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KEYWORD
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GaAlAs laser, Low-level Laser Therapy, Visual analog scale
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