The influence of shoulder position during multi-joint exercises in the relative scapular muscles activity in symptomatic and asymptomatic conditions.
J Back Musculoskelet Rehabil
; 36(4): 883-893, 2023.
Article
in En
| MEDLINE
| ID: mdl-36776036
ABSTRACT
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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Shoulder
/
Superficial Back Muscles
Type of study:
Diagnostic_studies
/
Observational_studies
/
Prevalence_studies
/
Risk_factors_studies
Limits:
Humans
Language:
En
Journal:
J Back Musculoskelet Rehabil
Journal subject:
FISIOLOGIA
/
REABILITACAO
Year:
2023
Document type:
Article
Affiliation country:
Portugal