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    Comparison of the activation and mechanical properties of scapulothoracic muscles in young tennis players with and without scapular dyskinesis: an observational comparative study
    (Mosby-Elsevier, 2024) Deniz, Volkan; Sariyildiz, Aylin; Buyuktas, Bilgihan; Basaran, Sibel
    Background: In tennis athletes with scapular dyskinesis, the activation of the scapulothoracic muscles during serve is not known. Also, the mechanical properties (tone, elasticity, and stiffness) of the scapulothoracic muscles of the tennis athletes with scapular dyskinesis are likely to change. The study aimed to evaluate the activation of the scapulothoracic muscles while performing tennis serve and to determine the changes in the mechanical properties of the same muscles in young tennis athletes with scapular dyskinesis. Methods: Seventeen tennis athletes with scapular dyskinesis aged between 11 and 18 years (the scapular dyskinesis group) and age- and gender-matched 17 asymptomatic tennis athletes (the control group) were included in the study. Activation of scapulothoracic muscles (descending-transverse-ascending trapezius and serratus anterior) in the 3 phases (preparation, acceleration, and follow-through) of the serve was evaluated using surface electromyography, and the mechanical properties of the same muscles were measured at rest by myotonometry.Results: Ascending trapezius activation in the follow-through phase was lower in the scapular dyskinesis group compared with the control group (mean difference 95% confidence interval: -22.8 [-41.2 to -4.5]) (P = .017). The tone and stiffness of the transverse trapezius (P = .043 and P = .017, respectively) were higher, whereas the same parameters of the ascending trapezius were lower (P = .008 and P = .010, respectively) in the scapular dyskinesis group compared with the control group.Conclusions: Activation of the ascending trapezius and the tone and stiffness of the transverse-ascending trapezius were altered in tennis athletes with scapular dyskinesis. Implementations to improve these changes can be included in the rehabilitation or training programs of young tennis athletes with scapular dyskinesis.(c) 2023 Journal of Shoulder and Elbow Surgery Board of Trustees. All rights reserved.
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    Effectiveness of corrective exercise program on alignment, muscle activation and biomechanical properties in forward head posture: A randomized controlled trial
    (Cukurova Univ, Fac Medicine, 2024) Sariyildiz, Aylin; Deniz, Volkan; Basaran, Sibel
    Purpose: The aim of this study was to investigate the effects of supervised corrective exercise program on craniovertebral angle (CVA), shoulder protraction angle (SPA), and activity/biomechanical properties of cervicothoracic muscles in medical students with forward head posture (FHP). Materials and Methods: Thirty-six medical students with FHP were allocated to an exercise group (n=18) or a control group (n=18). The participants in the exercise group followed an 8-week supervised corrective exercise program. CVA and SPA were evaluated with photogrammetry and activity and biomechanical chracteristics of the servicothoracic muscles were assessed with surface electromyography and myotonometry at baseline and after supervised exercise program. Results: Data of thirty-two participants (16 for both groups) were analyzed. A significant improvement of CVA [Mean Difference (MD) 95% Confidence Interval (CI): 7.8 (5.2 to 10.5)] and SPA [MD 95%CI: 3.7 (0.2 to 7.2)] was observed in the exercise group compared to the control group. Multiple regression analysis revealed that a reduction in right upper trapezius stiffness had a significant effect on CVA (B= 0.047, Adjusted R2= 0.61), and the change in the tone of the right lower trapezius (B= 2.85, Adjusted R2= 0.64) had a significant effect on SPA. Conclusion: An eight-week corrective exercise program improved cervicothoracic alignment in FHP. Streching exercises that reduce the stiffness of the upper trapezius and strengthening exercises that increase the tone of the lower trapezius can be prioritized in the management of FHP.