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- Title
Shoulder-Abduction Angle and Trapezius Muscle Activity During Scapular-Retraction Exercise.
- Authors
Kara, Dilara; Harput, Gulcan; Duzgun, Irem
- Abstract
Scapular-retraction exercises are often prescribed to enhance scapular stabilization. To investigate upper trapezius (UT), middle trapezius (MT), and lower trapezius (LT) activities and UT/MT and UT/LT ratios during scapular-retraction exercises with elastic resistance at different shoulder-abduction angles. Descriptive laboratory study. Biomechanical analysis laboratory. Thirty-five asymptomatic individuals. Surface electromyography was used to evaluate UT, MT, and LT activities during the scapular-retraction exercise at 0°, 45°, 90°, and 120° of shoulder abduction. The mean muscle activity ranged from 15.8% to 54.7% maximal voluntary isometric contraction (MVIC) for UT, 30.5% to 51.6% MVIC for MT, and 21.4% to 25.5% MVIC for LT. A significant muscle × angle interaction was found (P <.001). Post hoc analysis revealed that the MT was more activated than the UT and LT during both retraction at 0° (P <.001 and P =.01, respectively) and 120° (P =.03 and P =.002, respectively). During retraction at 45° and 90°, the LT generated less activity than the UT (P =.02 and P =.03, respectively) and MT (P <.001 and P =.002, respectively). Further, UT/MT and UT/LT ratios during retraction at 0° were lower than at 45° (P =.03 and P =.001, respectively) and 90° (P <.001 and P <.001, respectively). Retraction at 90° resulted in a higher UT/LT ratio than at 45° (P =.004) and 120° (P =.004). Due to less UT relative to MT activity, retraction at 0°, 45°, and 120° can be preferable in early shoulder training or rehabilitation. Additionally, retraction at 90° was the most effective exercise in activating all parts of the trapezius muscle.
- Subjects
SHOULDER physiology; STATISTICS; RESISTANCE training; SKELETAL muscle; MUSCLE contraction; ANALYSIS of variance; TRAPEZIUS muscle; EXERCISE physiology; T-test (Statistics); ABDUCTION (Kinesiology); SCAPULA; REPEATED measures design; BIOMECHANICS; ELECTROMYOGRAPHY; DATA analysis; BODY mass index; DATA analysis software; EXERCISE therapy
- Publication
Journal of Athletic Training (Allen Press), 2021, Vol 56, Issue 12, p1327
- ISSN
1062-6050
- Publication type
Article
- DOI
10.4085/1062-6050-0053.21