Comparison of scapulothoracic muscles onset and deactivation time between individuals with and without inferior angle type of scapular dyskinesis: A cross-sectional study

This is a cross-sectional study that aimed to compare upper trapezius (UT), middle trapezius (MT), lower trapezius (LT), and serratus anterior (SA) muscle onset, deactivation, and activation time from surface electromyography (sEMG) in shoulder flexion, scaption, and abduction between the inferior a...

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Published inWārasān Songkhlā Nakharin Vol. 43; no. 2; pp. 512 - 519
Main Authors Haruthai Petviset, Prasert Sakulsriprasert, Mantana Vongsirinavarat, Peemongkon Wattananon
Format Journal Article
LanguageEnglish
Published Prince of Songkla University 01.04.2021
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Abstract This is a cross-sectional study that aimed to compare upper trapezius (UT), middle trapezius (MT), lower trapezius (LT), and serratus anterior (SA) muscle onset, deactivation, and activation time from surface electromyography (sEMG) in shoulder flexion, scaption, and abduction between the inferior angle type of scapular dyskinesis (ISD) group (n = 6) and normal pattern of scapular motion (NP) group (n = 6). An independent t-test was used for statistical analysis. In flexion, early MT and LT deactivation time were found, and MT activation time in the ISD was shorter than the NP (p < 0.05). In scaption, early LT, and SA deactivation time were found in the ISD (p < 0.05). In abduction, UT deactivation and activation time were significantly different between groups (p < 0.05). This study demonstrated the early time of muscle deactivation and shorter muscle activation time of the scapular force couple muscles. Therefore, the active scapular control should be emphasized during shoulder elevation.
AbstractList This is a cross-sectional study that aimed to compare upper trapezius (UT), middle trapezius (MT), lower trapezius (LT), and serratus anterior (SA) muscle onset, deactivation, and activation time from surface electromyography (sEMG) in shoulder flexion, scaption, and abduction between the inferior angle type of scapular dyskinesis (ISD) group (n = 6) and normal pattern of scapular motion (NP) group (n = 6). An independent t-test was used for statistical analysis. In flexion, early MT and LT deactivation time were found, and MT activation time in the ISD was shorter than the NP (p < 0.05). In scaption, early LT, and SA deactivation time were found in the ISD (p < 0.05). In abduction, UT deactivation and activation time were significantly different between groups (p < 0.05). This study demonstrated the early time of muscle deactivation and shorter muscle activation time of the scapular force couple muscles. Therefore, the active scapular control should be emphasized during shoulder elevation.
Author Mantana Vongsirinavarat
Haruthai Petviset
Peemongkon Wattananon
Prasert Sakulsriprasert
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  organization: Department of Physical Therapy, Faculty of Physical Therapy, Mahidol University, Salaya Campus, Phutthamonthon, Nakhon Pathom, 73170 Thailand
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  fullname: Prasert Sakulsriprasert
  organization: Department of Physical Therapy, Faculty of Physical Therapy, Mahidol University, Salaya Campus, Phutthamonthon, Nakhon Pathom, 73170 Thailand
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  organization: Department of Physical Therapy, Faculty of Physical Therapy, Mahidol University, Salaya Campus, Phutthamonthon, Nakhon Pathom, 73170 Thailand
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  fullname: Peemongkon Wattananon
  organization: Department of Physical Therapy, Faculty of Physical Therapy, Mahidol University, Salaya Campus, Phutthamonthon, Nakhon Pathom, 73170 Thailand
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Snippet This is a cross-sectional study that aimed to compare upper trapezius (UT), middle trapezius (MT), lower trapezius (LT), and serratus anterior (SA) muscle...
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SubjectTerms electromyography
muscles
onset
pain
scapula
Title Comparison of scapulothoracic muscles onset and deactivation time between individuals with and without inferior angle type of scapular dyskinesis: A cross-sectional study
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