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Isometric muscle activation of the serratus anterior and trapezius muscles varies by arm position: a pilot study with healthy volunteers with implications for rehabilitation
- Source :
- Journal of Shoulder and Elbow Surgery. 26:1166-1174
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Background This study aimed to determine the most appropriate angle and moving direction of the arm for improving coordination of the periscapular muscles, including the serratus anterior (SA), upper trapezius (UT), middle trapezius (MT), and lower trapezius (LT). Methods Muscle activation amplitudes were evaluated in the SA, UT, MT, and LT in 11 healthy subjects by use of surface electromyography. The subjects were asked to maintain the arm position at 5 elevated positions with maximal effort against applied manual forces, which were directed from upper to lower (test 1), lower to upper (test 2), posterior to anterior in the frontal plane and lateral to medial in the sagittal plane (test 3), and anterior to posterior in the frontal plane and medial to lateral in the sagittal plane (test 4). The relative activity of the UT with respect to the SA, MT, and LT was calculated, resulting in the UT/SA, UT/MT, and UT/LT ratios. Results Test 4 in all positions but 150° of elevation in the frontal plane showed high activity of the SA with a low UT/SA ratio. High MT activity with a low UT/MT ratio was observed during test 3 at the 90° elevated position, whereas high LT activity without UT hyperactivation was not found. Discussion To strengthen the periscapular muscles in the balanced condition, horizontal adduction is recommended for the SA. Horizontal abduction at the 90° elevated position should be effective for the MT. Because no technique in this study was effective for the LT, further studies are needed.
- Subjects :
- Male
medicine.medical_treatment
Pilot Projects
Intermediate Back Muscles
Electromyography
Isometric exercise
Young Adult
03 medical and health sciences
0302 clinical medicine
Isometric Contraction
Healthy volunteers
medicine
Humans
Orthopedics and Sports Medicine
Range of Motion, Articular
muscle activation
030222 orthopedics
Rehabilitation
medicine.diagnostic_test
business.industry
Muscle activation
030229 sport sciences
General Medicine
Anatomy
periscapular muscles
Healthy Volunteers
Sagittal plane
Exercise Therapy
erexercise
medicine.anatomical_structure
Shoulder Impingement Syndrome
Coronal plane
Arm
Superficial Back Muscles
Surgery
muscle balance
business
should
Arm position
Subjects
Details
- ISSN :
- 10582746
- Volume :
- 26
- Database :
- OpenAIRE
- Journal :
- Journal of Shoulder and Elbow Surgery
- Accession number :
- edsair.doi.dedup.....89cf72283458244cffc23882645ca4d5