Kim Taeyeong, Kim Minhee, Lee Minyoung, Yoon Bumchul
Department of Health Science, Korea University Graduate School, Seoul, Korea.
College of Medicine, Korea University, Seoul, Korea.
J Back Musculoskelet Rehabil. 2019;32(3):437-443. doi: 10.3233/BMR-181293.
The prevalence of degenerative shoulder disease is increasing, and most shoulder diseases are accompanied by changed activation of the scapular muscles. However, the characteristics of scapular muscle activation in older adults have not yet been reported.
The aim of this study was to investigate the effect of age and load on scapular muscle activation during shoulder abduction and flexion.
Eleven older adults (5 men, 6 women; 71.1 ± 5.3 years) and ten young adults (5 men, 5 women; 25.0 ± 2.7 years) performed shoulder elevation (abduction and flexion) with and without a dumbbell. Electromyography were recorded from the upper, middle and lower trapezius, and serratus anterior muscles in the dominant side. Muscle activation was normalized by reference voluntary contractions.
During shoulder elevation with a dumbbell load, the activation of the middle trapezius (p= 0.036) in older adults was significantly higher than that in young adults during abduction. The activation of the upper trapezius (p= 0.001) in older adults was significantly higher than that in young adults during flexion.
The older adults have a higher activation of the upper and middle trapezius during shoulder elevation with a weighted load.
退行性肩部疾病的患病率正在上升，并且大多数肩部疾病都伴有肩胛肌激活的改变。然而，老年人肩胛肌激活的特征尚未见报道。
本研究旨在调查年龄和负荷对肩部外展和屈曲过程中肩胛肌激活的影响。
11名老年人（5名男性，6名女性；71.1±5.3岁）和10名年轻人（5名男性，5名女性；25.0±2.7岁）在有和没有哑铃的情况下进行肩部抬高（外展和屈曲）。记录优势侧上、中、下斜方肌和前锯肌的肌电图。肌肉激活通过参考自主收缩进行标准化。
在哑铃负荷下肩部抬高过程中，老年人外展时中斜方肌的激活（p = 0.036）显著高于年轻人。老年人屈曲时上斜方肌的激活（p = 0.001）显著高于年轻人。
在负重肩部抬高过程中，老年人上、中斜方肌的激活更高。
