The influence of shoulder position during multi-joint exercises in the relative scapular muscles activity in symptomatic and asymptomatic conditions.

Autor: Melo, Ana S.C., Vilas-Boas, J. Paulo, Cruz, Eduardo B., Macedo, Rui M., e Ferreira, Sílvia B., Sousa, Andreia S.
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Zdroj: Journal of Back & Musculoskeletal Rehabilitation; 2023, Vol. 36 Issue 4, p883-893, 11p
Abstrakt: BACKGROUND: Scapular muscles changes, as increased upper trapezius activity and decreased middle and lower trapezius and serratus anterior muscle activity, have been demonstrated in shoulder pain specific or non-specific conditions. Shoulder external rotation exercises have been recommended to improve scapular activity in shoulder pain. OBJECTIVE: To evaluate the relative scapular muscles activity during multi-joint exercises combining shoulder external rotation, trunk rotation and scapular squeeze. METHODS: Forty-one participants with and without shoulder pain were assessed in a cross-sectional study. They performed isometric multi-joint exercises at 0 ∘ and 90 ∘ of shoulder abduction with and without support. The relative activity of upper, middle, and lower trapezius and serratus anterior (upper/middle and lower portions) was measured through electromyography. The scapular muscular balance was assessed by the ratio between relative activity of the upper trapezius and the other muscles. RESULTS: Both groups presented similar results. The exercise at 90 ∘ abduction led to increased relative muscle activity against maximal voluntary contraction in both groups for upper trapezius (with support: 4% MVIC, p = 0.001 or 15% MVIC, p < 0.0001; and without support: 11% MVIC, p < 0.0001 or 13%, p < 0.0001, for asymptomatic and symptomatic group, respectively) and lower trapezius (with support: 66% MVIC, p < 0.0001 or 62% MVIC, p < 0.0001, for asymptomatic and symptomatic group, [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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