Background: Sling exercises are frequently used for the rehabilitation process of patients with shoulder joint injuries, but research on the significant frequency intensity and appropriate treatment duration for sling exercises with local vibration stimulation is lacking.
Objects: The aim of this study was to investigate the effects of sling exercise with vibration on shoulder range of motion (ROM), muscle strength, pain, and dysfunction in patients with a medical diagnosis of shoulder joint injury.
Methods: Twenty-two patients were randomly assigned to the experiment and control groups. Six sling exercises with and without 50 ㎐ vibrations were applied in the experiment and control groups, respectively. Each exercise consisted of 3 sets of 5 repetitions performed for 6 weeks. The assessment tools used included shoulder joint range of motion, muscle strength, pain level, and shoulder pain and disability index for functional disability. We conducted re-evaluations before and 3 and 6 weeks after intervention. The changes in the measurement variables were analyzed and compared between the two groups.
Results: The ROM of the external rotation of the shoulder joint had a significant interaction between the group and the measurement point (F=3.652, p<.05). In both groups, we found a significant increase in external rotation angle between the measurement points (p<.05). The flexor strength of the shoulder joint significant interaction between the group and the measurement point (F=4.247, p<.05). Both the experiment (p<.01) and control groups (p<.05) showed a significant increase in shoulder flexor strength at the measurement points. After 6 weeks of the interventions, both the groups showed significantly improved VAS (p<.01), SPADI (p<.01), and orthopedic tests (p<.01). However, there was no significant difference between the group and the measurement point in terms of the clinical outcomes observed.
Conclusion: The sling exercise with local vibration of 50 ㎐ affected the external rotation of the shoulder range of motion and improved shoulder flexor strength in the patients with shoulder injuries. Therefore, we propose the use of the sling exercise intervention with vibration in the exercise rehabilitation of patients with shoulder joint injuries.

Abstract
 Ⅰ. 서론
 Ⅱ. 연구방법
  1. 연구대상자
  2. 평가도구 및 측정방법
  3. 연구 설계와 중재방법
  4. 분석방법
 Ⅲ. 결과
  1. 연구대상자의 일반적 특성
  2. 실험군과 대조군 간에 어깨 관절가동범위와근력의 변화 양상 비교
  3. 실험군과 대조군 간에 통증 수준과 기능장애수준의 변화 양상 비교
  4. 실험군과 대조군에 따른 정형의학적 특수 검사의 변화 양상 비교
 Ⅳ. 고찰
 Ⅴ. 결론
 References

• 지창연(동탄시티병원 물리치료실) | Chang-yeon Chi (Dept. of Physical Therapy, Dong Tan City Hospital)
• 김선엽(대전대학교 보건의료과학대학 물리치료학과) | Suhn-yeop Kim (Dept. of Physical Therapy, College of Health Medical & Science, Daejeon University) Corresponding author