Cargando…

Scapular Retraction under Adduction Load: An Alternative to Overhead Exercises to Activate Infraspinatus, Upper, and Lower Trapezius in Subjects with and without Shoulder Pain

Exercises for lower trapezius (LT) often use overhead positions, causing compressive forces to the subacromial space. Scapular retraction would be an alternative to activate LT muscle. The present study aimed to assess the excitation levels of infraspinatus, upper trapezius, and lower trapezius musc...

Descripción completa

Detalles Bibliográficos
Autores principales: dos Santos, Jefferson James, Nagy, Rebeca Orozco, Souza, Matheus Almeida, Intelangelo, Leonardo, Barbosa, Michelle Almeida, Silveira-Nunes, Gabriela, Barbosa, Alexandre Carvalho
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8430934/
https://www.ncbi.nlm.nih.gov/pubmed/34501840
http://dx.doi.org/10.3390/ijerph18179251
_version_ 1783750819488727040
author dos Santos, Jefferson James
Nagy, Rebeca Orozco
Souza, Matheus Almeida
Intelangelo, Leonardo
Barbosa, Michelle Almeida
Silveira-Nunes, Gabriela
Barbosa, Alexandre Carvalho
author_facet dos Santos, Jefferson James
Nagy, Rebeca Orozco
Souza, Matheus Almeida
Intelangelo, Leonardo
Barbosa, Michelle Almeida
Silveira-Nunes, Gabriela
Barbosa, Alexandre Carvalho
author_sort dos Santos, Jefferson James
collection PubMed
description Exercises for lower trapezius (LT) often use overhead positions, causing compressive forces to the subacromial space. Scapular retraction would be an alternative to activate LT muscle. The present study aimed to assess the excitation levels of infraspinatus, upper trapezius, and lower trapezius muscles during a scapular retraction exercise under progressive adduction loads in subjects with and without painful shoulder. Electromyography of infraspinatus (IS), upper trapezius (UT), and LT was recorded during scapular retraction under progressive adduction loads of 42 participants, divided into two groups: with (SP, n = 26) and without shoulder pain (nSP, n = 16). The adduction loads of 20%, 30%, 40%, and 50% of the maximal voluntary contraction (MVC) were applied using a load cell. Normalized electromyography and the ratio between UT and LT (UT:LT) were used for statistical analysis. No differences were observed between groups, but a condition effect occurred for all muscles: UT showed higher values at 50% vs. 20% of MVC (p = 0.004); LT showed higher values on 40% and 50% of MVC (p = 0.001; 0.006). Higher values for IS were noted at 40% of MVC (vs. 20% of MVC; p = 0.04) and at 50% of MVC (vs. 20% of MVC; p = 0.001, vs. 30% of MVC, p = 0.001; vs. 40% of MVC; p = 0.001). UT:LT showed lower values at 50% of MVC (vs. 20% of MVC; p = 0.001 and vs. 30% of MVC; p = 0.016). Scapular retraction with adduction loads at 40–50% is an alternative to overhead exercises aiming to activate the LT and the IS muscles. The exercise ensures higher levels of LT and IS excitation without increasing UT excitation.
format Online
Article
Text
id pubmed-8430934
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-84309342021-09-11 Scapular Retraction under Adduction Load: An Alternative to Overhead Exercises to Activate Infraspinatus, Upper, and Lower Trapezius in Subjects with and without Shoulder Pain dos Santos, Jefferson James Nagy, Rebeca Orozco Souza, Matheus Almeida Intelangelo, Leonardo Barbosa, Michelle Almeida Silveira-Nunes, Gabriela Barbosa, Alexandre Carvalho Int J Environ Res Public Health Article Exercises for lower trapezius (LT) often use overhead positions, causing compressive forces to the subacromial space. Scapular retraction would be an alternative to activate LT muscle. The present study aimed to assess the excitation levels of infraspinatus, upper trapezius, and lower trapezius muscles during a scapular retraction exercise under progressive adduction loads in subjects with and without painful shoulder. Electromyography of infraspinatus (IS), upper trapezius (UT), and LT was recorded during scapular retraction under progressive adduction loads of 42 participants, divided into two groups: with (SP, n = 26) and without shoulder pain (nSP, n = 16). The adduction loads of 20%, 30%, 40%, and 50% of the maximal voluntary contraction (MVC) were applied using a load cell. Normalized electromyography and the ratio between UT and LT (UT:LT) were used for statistical analysis. No differences were observed between groups, but a condition effect occurred for all muscles: UT showed higher values at 50% vs. 20% of MVC (p = 0.004); LT showed higher values on 40% and 50% of MVC (p = 0.001; 0.006). Higher values for IS were noted at 40% of MVC (vs. 20% of MVC; p = 0.04) and at 50% of MVC (vs. 20% of MVC; p = 0.001, vs. 30% of MVC, p = 0.001; vs. 40% of MVC; p = 0.001). UT:LT showed lower values at 50% of MVC (vs. 20% of MVC; p = 0.001 and vs. 30% of MVC; p = 0.016). Scapular retraction with adduction loads at 40–50% is an alternative to overhead exercises aiming to activate the LT and the IS muscles. The exercise ensures higher levels of LT and IS excitation without increasing UT excitation. MDPI 2021-09-02 /pmc/articles/PMC8430934/ /pubmed/34501840 http://dx.doi.org/10.3390/ijerph18179251 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
dos Santos, Jefferson James
Nagy, Rebeca Orozco
Souza, Matheus Almeida
Intelangelo, Leonardo
Barbosa, Michelle Almeida
Silveira-Nunes, Gabriela
Barbosa, Alexandre Carvalho
Scapular Retraction under Adduction Load: An Alternative to Overhead Exercises to Activate Infraspinatus, Upper, and Lower Trapezius in Subjects with and without Shoulder Pain
title Scapular Retraction under Adduction Load: An Alternative to Overhead Exercises to Activate Infraspinatus, Upper, and Lower Trapezius in Subjects with and without Shoulder Pain
title_full Scapular Retraction under Adduction Load: An Alternative to Overhead Exercises to Activate Infraspinatus, Upper, and Lower Trapezius in Subjects with and without Shoulder Pain
title_fullStr Scapular Retraction under Adduction Load: An Alternative to Overhead Exercises to Activate Infraspinatus, Upper, and Lower Trapezius in Subjects with and without Shoulder Pain
title_full_unstemmed Scapular Retraction under Adduction Load: An Alternative to Overhead Exercises to Activate Infraspinatus, Upper, and Lower Trapezius in Subjects with and without Shoulder Pain
title_short Scapular Retraction under Adduction Load: An Alternative to Overhead Exercises to Activate Infraspinatus, Upper, and Lower Trapezius in Subjects with and without Shoulder Pain
title_sort scapular retraction under adduction load: an alternative to overhead exercises to activate infraspinatus, upper, and lower trapezius in subjects with and without shoulder pain
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8430934/
https://www.ncbi.nlm.nih.gov/pubmed/34501840
http://dx.doi.org/10.3390/ijerph18179251
work_keys_str_mv AT dossantosjeffersonjames scapularretractionunderadductionloadanalternativetooverheadexercisestoactivateinfraspinatusupperandlowertrapeziusinsubjectswithandwithoutshoulderpain
AT nagyrebecaorozco scapularretractionunderadductionloadanalternativetooverheadexercisestoactivateinfraspinatusupperandlowertrapeziusinsubjectswithandwithoutshoulderpain
AT souzamatheusalmeida scapularretractionunderadductionloadanalternativetooverheadexercisestoactivateinfraspinatusupperandlowertrapeziusinsubjectswithandwithoutshoulderpain
AT intelangeloleonardo scapularretractionunderadductionloadanalternativetooverheadexercisestoactivateinfraspinatusupperandlowertrapeziusinsubjectswithandwithoutshoulderpain
AT barbosamichellealmeida scapularretractionunderadductionloadanalternativetooverheadexercisestoactivateinfraspinatusupperandlowertrapeziusinsubjectswithandwithoutshoulderpain
AT silveiranunesgabriela scapularretractionunderadductionloadanalternativetooverheadexercisestoactivateinfraspinatusupperandlowertrapeziusinsubjectswithandwithoutshoulderpain
AT barbosaalexandrecarvalho scapularretractionunderadductionloadanalternativetooverheadexercisestoactivateinfraspinatusupperandlowertrapeziusinsubjectswithandwithoutshoulderpain