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KMID : 0357220140260060379
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Journal of Korean Society Physical Therapy
2014 Volume.26 No. 6 p.379 ~ p.385
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Immediate Effects of Pulsed Magnetic Field in Subjects with Upper Trapezius Trigger Point
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Kang Sun-Young
Park Joo-Hee
Song Ja-Eik
Jeon Hye-Seon
Lee Hyun-Sook
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Abstract
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Purpose: This study was to determine the immediate effects of pulsed magnetic field (PMF) in subjects with upper trapezius (UT) trigger point (TrP).
Methods: Fifteen subjects with UT TrP were recruited for the study’ s PMF group (pain threshold=2.29 kg/cm2), and 15 age-, weight-, and gender-matched subjects with UT TrP were recruited for control group (pain threshold=2.25 kg/cm2). Pressure algometer was used to measure pressure pain threshold on UT TrP and, cervical range of motion (ROM) inclinometer was used to measure cervical ROM. Surface electromyography was used to record UT, lower trapezius, and serratus anterior muscle activity and relative ratio during scapular plane abduction between pre- and post-treatment.
Results: The PMF effectively improved pain threshold and concurrently increased ROM (rotation to the painful side, lateral flexion to the nonpainful side). In addition, the PMF may effectively deactivate UT activity during abduction and the muscle activity ratio between UT and serratus anterior.
Conclusion: These findings provided empirical evidence that PMF can be an effective treatment method to reduce pain
threshold, to increase cervical ROM, and deactivate UT activity in individuals with TrP.
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KEYWORD
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Eletromyography, Pulsed magnetic field, Pressure pain threshold, Range of motion, Trigger point, Upper trapezius
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