【論文摘要】The Comparison of the Effects of External Rotator Eccentric Exercise and Scapular Stabilization Exercise on Musculotendinous Architecture of Supraspinatus

【論文摘要】比較肩外轉肌群離心訓練與肩胛穩定訓練對於棘上肌肌肉肌腱結構之影響

毛冠盛(Kuan-Sheng Mao) ； 林燕慧(Yang-Hua Lin) ； 陳柏村(Po-Tsun Chen)

《物理治療》 47卷4期 (2022/12) Pp. 279-279

https://doi.org/10.6215/FJPT.202212.O01

摘要

Background and Purpose: Scapular dyskinesis (ScD) is commonly seen in overhead athletes and disturbing the length-tension relationship of rotator cuff. The effectiveness of intervention exercises for shoulder disorders, i.e., scapular stabilization exercises and external rotator eccentric training, focusing on the muscle control has been reported. The musculotendinous architecture, including the pennation angle (PA) and fiber bundle length (FBL), can reflect the status of muscle length and contraction. However, there was no thorough evidence to examine the cause-and-effect relationship between scapular stability and supraspinatus architecture. Thus, the purpose of this study was to investigate the effects of scapular stabilization and external rotator eccentric exercise on muscle strength and musculotendinous architecture of supraspinatus in volleyball players with ScD. Methods: Twenty-two volleyball players were recruited and randomly allocated to two groups for eight-week exercise training: scapular stabilization with supraspinatus eccentric exercise (ECC-SCA) group and isolated scapular stabilization exercise (SCA) group. The evaluations included the PA and FBL of supraspinatus by sonography and the maximal strength of periscapular muscles and rotator cuff. Two-way repeated measures ANOVA was used to compare the differences between the groups and the intervention. Results: There were significant interactions between group and intervention in FBL and PA, respectively. The post hoc test showed that the FBL (4.14 ± 0.54 cm vs. 4.60 ± 0.59 cm, p = 0.012) and PA (19.72° ± 3.56° vs. 21.93° ± 4.35°, p = 0.001) in ECC-SCA were significantly increased after intervention, while no significant change was noticed in SCA. The strength of internal rotator (ECC-SCA: 11.9 ± 2.6 kg vs. 13.2 ± 3 kg, p = 0.024; SCA: 12.5 ± 2.6 kg vs. 14.6 ± 2.7 kg, p = 0.005), middle trapezius (ECC-SCA: 21.2 ± 4.4 kg vs. 25.6 ± 5.6 kg, p = 0.017; SCA: 21.9 ± 6.7 kg vs. 27.2 ± 5.5 kg, p ＜ 0.001), lower trapezius (ECC-SCA: 19.6 ± 3.9 kg vs. 23.2 ± 4.4 kg, p = 0.016; SCA: 20 ± 5.9 kg vs. 24.6 ± 5.4 kg, p = 0.004) and serratus anterior (ECC-SCA: 31.7 ± 7.7 kg vs. 40.4 ± 9.6 kg, p = 0.003; SCA: 32 ± 6.6 kg vs. 42.6 ± 13.9 kg, p = 0.009) in both groups were significantly increased after intervention, but the external rotator didn't show the significant changes. Conclusions: The ECC-SCA can significantly lengthen FBL and increase PA of supraspinatus as well as increase periscapular muscle strength in volleyball players with ScD. Clinical Relevance: The ECC-SCA could be recommended for the overhead athletes whose rotator cuff may be shortened and stiff after long-term training and requiring stretching and strengthening.