Effect of Isometric Horizontal Abduction on Scapular and Shoulder Muscle Activity During Knee Push-up Plus With Different Shoulder Angles in Individuals With Scapular Winging
Background: Individuals with scapular winging have a weak serratus anterior (SA) muscle, and to compensate, the pectoralis major (PM) and upper trapezius (UT) muscles excessively activate, which can cause upper extremity dysfunction. This study aimed to compare the effects of isometric horizontal...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Korean Research Society of Physical Therapy
2023-05-01
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| Series: | Physical Therapy Korea |
| Subjects: |
| _version_ | 1827309738499506176 |
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| author | Jung-Hoon Choi Heon-Seock Cynn Seung-Min Baik Seok-Hyun Kim |
| author_facet | Jung-Hoon Choi Heon-Seock Cynn Seung-Min Baik Seok-Hyun Kim |
| author_sort | Jung-Hoon Choi |
| collection | DOAJ |
| description | Background: Individuals with scapular winging have a weak serratus anterior (SA) muscle,
and to compensate, the pectoralis major (PM) and upper trapezius (UT) muscles excessively
activate, which can cause upper extremity dysfunction. This study aimed to compare the effects
of isometric horizontal abduction (IHA) on SA, PM, and UT muscle activity, as well as the
SA/PM and SA/UT muscle activity ratios during knee push-up plus (KPP) at 90° and 120° of
shoulder flexion.
Objects: This study aimed to compare the effects of IHA on SA, PM, and UT muscle activity,
as well as the SA/PM and SA/UT muscle activity ratios during KPP at 90° and 120° of shoulder
flexion.
Methods: This study, conducted at a university research laboratory, included 20 individuals
with scapular winging. Participants performed KPP with and without IHA at 90° (KPP90) and
120° (KPP120) of shoulder flexion. SA, PM, and UT muscle activity were measured using surface
electromyography.
Results: PM activity in KPP90 with IHA was significantly lower than KPP90 and in KPP120 was
significantly lower than KPP90. UT activity was significantly greater with IHA than without IHA
and at 120° than 90° of shoulder flexion. SA/PM muscle activity ratio was significantly higher
in KPP90 with IHA than without IHA and in KPP120 than in KPP90. SA/UT muscle activity ratio
was significantly lower with IHA than without IHA.
Conclusion: KPP90 with IHA and KPP120 are effective exercises to reduce PM activity and increase
SA/PM muscle activity ratio. However, applying IHA in KPP90 also reduces SA/UT muscle
activity ratio, implying that it would be preferable to apply KPP120 in individuals overusing
their UT muscles. |
| first_indexed | 2024-04-24T19:46:53Z |
| format | Article |
| id | doaj.art-f164a083aa804115b6557394ef675c21 |
| institution | Directory Open Access Journal |
| issn | 1225-8962 2287-982X |
| language | English |
| last_indexed | 2024-04-24T19:46:53Z |
| publishDate | 2023-05-01 |
| publisher | Korean Research Society of Physical Therapy |
| record_format | Article |
| series | Physical Therapy Korea |
| spelling | doaj.art-f164a083aa804115b6557394ef675c212024-03-25T06:28:35ZengKorean Research Society of Physical TherapyPhysical Therapy Korea1225-89622287-982X2023-05-0130216016810.12674/ptk.2023.30.2.160Effect of Isometric Horizontal Abduction on Scapular and Shoulder Muscle Activity During Knee Push-up Plus With Different Shoulder Angles in Individuals With Scapular WingingJung-Hoon Choi0https://orcid.org/0000-0003-1166-9917Heon-Seock Cynn1https://orcid.org/0000-0002-5810-2371Seung-Min Baik2https://orcid.org/0000-0001-7885-9374Seok-Hyun Kim3https://orcid.org/0000-0002-0951-0360Applied Kinesiology and Ergonomic Technology Laboratory, Department of Physical Therapy, The Graduate School, Yonsei UniversityApplied Kinesiology and Ergonomic Technology Laboratory, Department of Physical Therapy, The Graduate School, Yonsei UniversityApplied Kinesiology and Ergonomic Technology Laboratory, Department of Physical Therapy, The Graduate School, Yonsei UniversityApplied Kinesiology and Ergonomic Technology Laboratory, Department of Physical Therapy, The Graduate School, Yonsei UniversityBackground: Individuals with scapular winging have a weak serratus anterior (SA) muscle, and to compensate, the pectoralis major (PM) and upper trapezius (UT) muscles excessively activate, which can cause upper extremity dysfunction. This study aimed to compare the effects of isometric horizontal abduction (IHA) on SA, PM, and UT muscle activity, as well as the SA/PM and SA/UT muscle activity ratios during knee push-up plus (KPP) at 90° and 120° of shoulder flexion. Objects: This study aimed to compare the effects of IHA on SA, PM, and UT muscle activity, as well as the SA/PM and SA/UT muscle activity ratios during KPP at 90° and 120° of shoulder flexion. Methods: This study, conducted at a university research laboratory, included 20 individuals with scapular winging. Participants performed KPP with and without IHA at 90° (KPP90) and 120° (KPP120) of shoulder flexion. SA, PM, and UT muscle activity were measured using surface electromyography. Results: PM activity in KPP90 with IHA was significantly lower than KPP90 and in KPP120 was significantly lower than KPP90. UT activity was significantly greater with IHA than without IHA and at 120° than 90° of shoulder flexion. SA/PM muscle activity ratio was significantly higher in KPP90 with IHA than without IHA and in KPP120 than in KPP90. SA/UT muscle activity ratio was significantly lower with IHA than without IHA. Conclusion: KPP90 with IHA and KPP120 are effective exercises to reduce PM activity and increase SA/PM muscle activity ratio. However, applying IHA in KPP90 also reduces SA/UT muscle activity ratio, implying that it would be preferable to apply KPP120 in individuals overusing their UT muscles.muscle weaknesspectoralis musclesscapular wingingshoulder bladetrapezius muscle |
| spellingShingle | Jung-Hoon Choi Heon-Seock Cynn Seung-Min Baik Seok-Hyun Kim Effect of Isometric Horizontal Abduction on Scapular and Shoulder Muscle Activity During Knee Push-up Plus With Different Shoulder Angles in Individuals With Scapular Winging Physical Therapy Korea muscle weakness pectoralis muscles scapular winging shoulder blade trapezius muscle |
| title | Effect of Isometric Horizontal Abduction on Scapular and Shoulder Muscle Activity During Knee Push-up Plus With Different Shoulder Angles in Individuals With Scapular Winging |
| title_full | Effect of Isometric Horizontal Abduction on Scapular and Shoulder Muscle Activity During Knee Push-up Plus With Different Shoulder Angles in Individuals With Scapular Winging |
| title_fullStr | Effect of Isometric Horizontal Abduction on Scapular and Shoulder Muscle Activity During Knee Push-up Plus With Different Shoulder Angles in Individuals With Scapular Winging |
| title_full_unstemmed | Effect of Isometric Horizontal Abduction on Scapular and Shoulder Muscle Activity During Knee Push-up Plus With Different Shoulder Angles in Individuals With Scapular Winging |
| title_short | Effect of Isometric Horizontal Abduction on Scapular and Shoulder Muscle Activity During Knee Push-up Plus With Different Shoulder Angles in Individuals With Scapular Winging |
| title_sort | effect of isometric horizontal abduction on scapular and shoulder muscle activity during knee push up plus with different shoulder angles in individuals with scapular winging |
| topic | muscle weakness pectoralis muscles scapular winging shoulder blade trapezius muscle |
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