Journal of the Korean Society of Physical Medicine (대한물리의학회지)

The Korean Society of Physical Medicine (대한물리의학회)
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Comparison of the Maximal Muscular Activities of the Deltoid During Shoulder Abductions in Patients with Adhesive Capsulitis

유착성 관절낭염 환자의 어깨벌림 각도에 따른 중간어깨세모근의 최대근활성도 비교

  • Song, Il-Gyu (Department of Physical Therapy, Faculty of Health Science, Eulji University) ;
  • Lee, Han-Suk (Department of Physical Therapy, Eulji University) ;
  • Park, Sun-Wook (Samsung Medical Center)
  • 송일규 (을지대학교 물리치료학과 보건과학대학원) ;
  • 이한숙 (을지대학교 물리치료학과) ;
  • 박선욱 (삼성서울병원)
  • Received : 2016.08.22
  • Accepted : 2016.09.19
  • Published : 2016.11.30
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Abstract

PURPOSE: This study aimed to compare the electromyography (EMG) activity for the middle deltoid (MD) and upper trapezius (UT) muscles in various shoulder abduction angles in patients with adhesive capsulitis (AC). METHODS: A total of 15 subjects participated in the study: 6 without AC (control group) and 9 with AC (AC group). The muscle activities of the UT and MD were measured using EMG during maximal static shoulder abductions in both groups. Each subject performed three repetitions of horizontal abduction at $0^{\circ}$, $30^{\circ}$, $60^{\circ}$, and $90^{\circ}$ of the shoulder abduction angle in a sitting position. The measurement data from the middle 3-seconds of the 5-second periods were used. The mean value of three separate sets of measurements was used in the data analysis. For each muscle, independent t-tests were performed to determine group differences. A measured repeated-measures ANOVA was performed using Bonferroni's post-hoc test. RESULTS: The muscle activity of the UT was significantly greater in the AC group; than in the control group (p<.05). The muscle activity of the MD was significantly lower in the AC group; than in the control group (p<.05). The greatest level of muscle activity for both the MD and UT was demonstrated at the $0-60^{\circ}$ and $0-90^{\circ}$ of shoulder abduction angles in the AC group. CONCLUSION: These findings showed that low muscle activation of the MD may contribute to hyperactivity of the UT during shoulder abduction in AC patients.

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