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The dose-dependent effect of an 830-nm, 450-mW low-level laser therapy on the myofacial trigger point of the upper trapezius muscle: a randomized, double-blinded, clinical trial
Lee JH, Han JT
Journal of Physical Therapy Science 2011 Dec;23(6):933-935
clinical trial
6/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: No; Blind subjects: Yes; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

PURPOSE: The purpose of this study was to evaluate the dose-dependent effect of treatment with an 830-nm, 450-mW GaAlAs laser on changes of the pressure-pain threshold (PPT) of the myofascial trigger point (MTrP) of the upper trapezius (UT) muscles of seated workers, in comparison with a placebo GaAlAs laser. SUBJECTS: Twenty-four seated workers (10 males, 14 females) with UT pain agreed to participate in this study. METHODS: The subjects were given treatment either with a placebo GaAlAs laser or an active GaAlAs laser according to a double-blinded, randomized procedure. RESULTS: The placebo group did not show significant changes in PPT after 1 min, 2 min and 5 min of low-level laser therapy (LLLT). The active group did not show significant changes in pressure-pain threshold (PPT) after 1 min and 2 min of LLLT. However, significant changes in PPT were apparent after 5 min of LLLT. CONCLUSION: We suggest that a higher energy, such as 1929 J/cm2, may be necessary to produce an immediate effect on PPT when treating the MTrP of the UT with an 830-nm, 450-mW GaAlAs laser.

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