Intelangelo Leonardo, Ignacio Lassaga, Mendoza Cristian, Bordachar Diego, Jerez-Mayorga Daniel, Barbosa Alexandre Carvalho
Musculoskeletal Research Unit, University Center for Assistance, Teaching and Research, University of Gran Rosario, Corrientes 1245, Rosario, Argentina.
Musculoskeletal Research Unit, University Center for Assistance, Teaching and Research, University of Gran Rosario, Corrientes 1245, Rosario, Argentina.
Clin Biomech (Bristol). 2022 Feb;92:105583. doi: 10.1016/j.clinbiomech.2022.105583. Epub 2022 Jan 21.
Serratus anterior strengthening generally appears in shoulder rehabilitation protocols. This study's aim was to measure electromyographic activity of the serratus anterior, upper trapezius, and infraspinatus muscles during the Supine Scapular Punch exercise in healthy volunteers and those with unilateral shoulder pain.
Fifty-four participants were included and grouped as without (n = 34, age = 25.8 years) or with unilateral shoulder pain (n = 20, age = 26.3 years, visual analogue scale = 4.15 cm). Electromyographic activity of the serratus anterior, upper trapezius, and infraspinatus muscles was assessed during Supine Scapular Punch (four phases: P1 = press up concentric, P2 = Supine Scapular Punch concentric, P3 = Supine Scapular Punch eccentric, P4 = press up eccentric) performed under two conditions, with and without additional load.
Overall muscle activity during P1 and P4 was negligible (< 10% maximal voluntary isometric contractions). During P2 and P3, no statistically significant differences in serratus anterior and upper trapezius muscle activity were found between groups, with moderate to high serratus anterior activity (28.94% to 44.3%) and very low upper trapezius activity (< 6%). Upper trapezius/serratus anterior activity ratios ranged from 0.09 to 0.18. Overall infraspinatus muscle activity was always very low (< 10%).
The Supine Scapular Punch induces moderate to high serratus anterior muscle activity with very low upper trapezius and infraspinatus activation. Based on these results, the Supine Scapular Punch is a safe exercise that can be used in the early phases of shoulder rehabilitation.
前锯肌强化训练通常出现在肩部康复方案中。本研究的目的是测量健康志愿者和单侧肩部疼痛患者在仰卧位肩胛冲击练习过程中前锯肌、上斜方肌和冈下肌的肌电活动。
纳入54名参与者，分为无单侧肩部疼痛组（n = 34，年龄 = 25.8岁）和单侧肩部疼痛组（n = 20，年龄 = 26.3岁，视觉模拟评分 = 4.15 cm）。在有和没有额外负荷的两种条件下进行仰卧位肩胛冲击练习（四个阶段：P1 = 上推向心收缩，P2 = 仰卧位肩胛冲击向心收缩，P3 = 仰卧位肩胛冲击离心收缩，P4 = 上推离心收缩）时，评估前锯肌、上斜方肌和冈下肌的肌电活动。
P1和P4期间的总体肌肉活动可忽略不计（<最大自主等长收缩的10%）。在P2和P3期间，两组之间在前锯肌和上斜方肌的肌肉活动方面未发现统计学上的显著差异，前锯肌活动为中度至高度（28.94%至44.3%），上斜方肌活动非常低（<6%）。上斜方肌/前锯肌活动比值在0.09至0.18之间。总体冈下肌活动始终非常低（<10%）。
仰卧位肩胛冲击练习可诱发前锯肌的中度至高度肌肉活动，而上斜方肌和冈下肌的激活程度非常低。基于这些结果，仰卧位肩胛冲击练习是一种安全的练习，可用于肩部康复的早期阶段。
