Median Frequency Analysis of Shoulder Muscles Using EMG Power Spectrum Analysis After Rotator Cuff Repair

Kang, Jeong-Il; Moon, Young-Jun

doi:10.5392/ijoc.2014.10.3.090

Cited by 2 publications

(1 citation statement)

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“…The MDF shifts from high frequency to low frequency due to a decrease in motor neuron excitability, change in the depolarization region, and change in the Na + K + ion balance of the muscle fascia24 ) . Kang and Moon25 ) measured MDF of patients with rotator cuff tear three weeks after rotator cuff repair. It is said that muscle fatigue is indicated by a shift in MDF from high frequency to low frequency in muscles around the shoulder.…”

Section: Discussionmentioning

confidence: 99%

The effect of exercise types for rotator cuff repair patients on activities of shoulder muscles and upper limb disability

Kang

Moon²,

Choi

et al. 2016

J Phys Ther Sci

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[Purpose] This study investigated the effect on activities, shoulder muscle fatigue, upper limb disability of two exercise types performed by patients in the post- immobilization period of rotator cuff repair. [Subjects and Methods] The intervention program was performed by 20 patients from 6 weeks after rotator cuff repair. Ten subjects each were randomly allocated to a group performing open kinetic chain exercise and a group preforming closed kinetic chain exercise. Muscle activity and median frequency were measured by using sEMG and the Upper Extremity Function Assessment before and after conducting the intervention and changes in the results were compared. [Results] There was a significant within group increases in the activities of the shoulder muscles, except for the posterior deltoid. The median power frequencies (MFD) of the supraspinatus, infraspinatus and anterior deltoid significantly increased in the open kinetic chain exercise group, but that of the posterior deltoid decreased. There were significant differences in the changes in the upper limb disability scores of the two groups, in the shoulder muscle activities, except for that of the posterior deltoid, in the comparison of the change in the muscle activities of the two groups, and in the MDFs of all shoulder muscles. [Conclusion] The Median power frequencies of all these muscles after closed kinetic chain exercise increased indicating that muscle fatigue decreased. Therefore, research into exercise programs using closed kinetic chain exercises will be needed to establish exercise methods for reducing muscle fatigue.

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Section: Discussionmentioning

confidence: 99%