Purpose: Repetitive and asymmetric movements in tennis can result in biomechanical adaptation in shoulder joint. The aim of this study was to investigate the differences in shoulder range of motion (ROM), strength, and functional performance tests between the dominant and nondominant shoulders, as well as to identify gender differences in junior tennis players. Methods: Forty-two junior tennis players (age mean: 11.3 [1.2] y, body mass index 18.3 [2.4] kg/m2) were included in the study. Shoulder internal rotation (IR), external rotation (ER) ROM, and total ROM, IR and ER isokinetic strength and closed kinetic chain upper-extremity stability, seated medicine ball throw used, grip hold tests were applied bilaterally. Paired sample t test and Student t test were used to compare the differences. Results: ER ROM was greater, while IR ROM and total ROM were lower on the dominant shoulder (all P values < .05). Nineteen players had glenohumeral IR deficit (IR ROM difference >13°). The players had a greater ER strength on the dominant side and similar IR strength between shoulders. There was significant difference in seated medicine ball throw results between the dominant and nondominant sides (P < .001). The mean distance for bilateral seated medicine ball throw was 377.02 (85.70) m, and closed kinetic chain upper-extremity stability results were calculated as a mean of 15.85 (1.72) touches. Differences between the genders: total ROM of the dominant shoulder was higher in female players (P = .045), the IR PT/BW at 60°/s angular speed was higher in male players’ dominant shoulder (P = .030), and closed kinetic chain upper-extremity stability performance was higher in male players (P = .019). Conclusions: Adolescent tennis players demonstrated differences in strength, ROM, and functional performance results between the dominant and nondominant shoulders. Gender differences were also seen in the aforementioned parameters in junior tennis players. Determining these differences may improve our understanding of sport-specific shoulder joint adaptations in tennis.

The ankle dorsiflexor muscle strength might be increased by performing Maitland Grade III mobilization and this increase might be preserved for 30 minutes, while Maitland Grade I mobilization did not lead a such improvement in healthy participants.

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Tenis oyuncularında omuz performansı ile ilişkili birçok faktör bulunmaktadır. Bu çalışmanın amacı, adolesan tenis oyuncularının üst ekstremite performans parametreleri ile omuz rotator kas kuvveti arasındaki ilişkiyi incelemekti.Yöntem: Çalışmaya 10 ile 18 yaş arası 31 adolesan tenis oyuncusu dahil edildi. Üst ekstremite performansını belirlemede sağlık topu fırlatma, kapalı kinetik zincir üst ekstremite stabilite testi ve kavrama kuvveti testi kullanıldı. Omuz rotator izokinetik kas kuvveti ISOMED 2000 (D&R GmbH, Almanya) sistemi ile değerlendirildi. İstatistiksel analizde doğrusal regresyon analizi kullanıldı.Sonuçlar: Sağlık topu fırlatma mesafesi ile 60°/s açısal hızda internal rotator (İR) tepe tork (TT) (r=0,535, p=0,002) ve eksternal rotator (ER) TT (r=0,421, p=0,018) değerleri arasında pozitif yönde orta düzeyde ilişki bulundu. Kavrama kuvveti ile 60°/s İR-TT (r=0,647, p=0,001) ve ER-TT (r=0,645, p=0,001) değerleri arasında güçlü düzeyde ilişki bulundu. Kapalı kinetik zincir üst ekstremite stabilite test sonuçları ile 60°/s ER TT arasında ilişki saptandı (r=0,391, p=0,029). Tartışma: Çalışmanın sonucunda; adolesan tenis oyuncularında omuz rotator kas kuvveti artıkça omuz performansının arttığı görüldü. Tenis oyuncularında performansı etkileyen faktörlerin adolesan dönemde saptanması, performansı arttırmak ve koruyucu yönde önlemler almak için oldukça önemlidir.

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