Journals / Düzce Üniversitesi Spor Bilimleri Dergisi / 2026 / Cilt: 6 Sayı: 2

An Analysis of Bilateral Asymmetry in Cyclical and Non-Cyclical Sports

Dönüşümlü ve Dönüşümsüz Sporlarda Bilateral Asimetrinin İncelenmesi

Hasan Basri Taşkın(KASTAMONU ÜNİVERSİTESİ)0000-0002-0770-3214
Bayram Ceylan(Kastamonu Üniversitesi)0000-0002-6753-1848
Pages
117–121
Publication Date
2026-10-27
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Larger sample sizes and longitudinal follow-up studies could clarify the asymmetry–performance–injury relationship.

📌 3 Key Takeaways

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Objective & Hypothesis:This study aims to compare bilateral asymmetry levels in young athletes engaged in symmetrical (swimming) and asymmetrical (kickboxing) sports.
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Key Findings & Data:The study included 16 swimmers and 16 kickboxers aged 8–12 years, who had been training regularly for at least 3 years, participated in ≥3 training sessions per week, had at least one competition experience in the last 2 years, and had not sustained any injuries in the previous 3 months.
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Conclusion & Impact:Larger sample sizes and longitudinal follow-up studies could clarify the asymmetry–performance–injury relationship.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Bilaterel asimetri · Kick boks · Yüzme

Abstract

This study aims to compare bilateral asymmetry levels in young athletes engaged in symmetrical (swimming) and asymmetrical (kickboxing) sports. The study included 16 swimmers and 16 kickboxers aged 8–12 years, who had been training regularly for at least 3 years, participated in ≥3 training sessions per week, had at least one competition experience in the last 2 years, and had not sustained any injuries in the previous 3 months. Upper extremity asymmetry was assessed using the handgrip strength (HGS) test, while lower extremity asymmetry was evaluated using the contact time asymmetry percentage calculated with My Jump 2 during single-leg countermovement jump (CMJ). For HGS, classification was made based on the highest right/left ratio using the “10% rule.” CMJ and HGS outcomes were analyzed using independent samples t-test and Mann–Whitney U test, respectively (p<0.05). No significant difference was found in CMJ contact time asymmetry [kickboxing: 4.8 ± 4.0; swimming: 5.8 ± 3.1; p>0.05; d=-0.29] or HGS asymmetry [kickboxing: 2.3 ± 2.0; swimming: 1.3 ± 1.0; p>0.05; d=0.20]. CMJ performance also showed similarity between groups (p=0.43). The findings suggest that sport-specific movement symmetry may have a limited effect on determining asymmetry in this age group, and individual neuromuscular differences may play a more determining role. Larger sample sizes and longitudinal follow-up studies could clarify the asymmetry–performance–injury relationship.

Özet

Bu çalışma, dönüşümlü (yüzme) ve dönüşümsüz (kick boks) sporlarla uğraşan genç sporcularda bilateral asimetri düzeylerini karşılaştırmayı amaçlamaktadır. Çalışmaya 8–12 yaş aralığında, en az 3 yıldır düzenli antrenman yapan ve haftada ≥3 antrenmana katılan, son 2 yılda en az bir müsabaka deneyimi olan ve son 3 ayda sakatlık yaşamamış 16 yüzücü ve 16 kick boksçu dahil edilmiştir. Üst ekstremite asimetrisi el kavrama kuvveti (EKK) testi ile, alt ekstremite asimetrisi tek ayakla countermovement jump (CMJ) sırasında My Jump 2 ile hesaplanan kontakt zaman asimetri yüzdesi ile değerlendirilmiştir. EKK için en yüksek sağ/sol oranı üzerinden “%10 kuralı” ile sınıflama yapılmış; CMJ ve EKK çıktıları sırasıyla bağımsız örneklem t-testi ve Mann–Whitney U testi ile analiz edilmiştir (p0.05; d=-0.29] ve EKK asimetrisi [kick boks: 2.3 ± 2.0; yüzme: 1.3 ± 1.0; p>0.05; d=0.20] açısından anlamlı fark bulunmamıştır. CMJ performansı da benzerlik göstermiştir (p=0.43). Bulgular, branşa özgü hareket simetrisinin bu yaş grubunda asimetriyi belirlemede sınırlı etkisi olabileceğini ve bireysel nöromüsküler farklılıkların daha belirleyici rol oynayabileceğini düşündürmektedir. Daha geniş örneklemler ve boylamsal izlem çalışmaları, asimetri–performans–sakatlık ilişkisini açıklığa kavuşturabilir.

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Cite This Article

Taşkın, H. B., Ceylan, B. (2026). An Analysis of Bilateral Asymmetry in Cyclical and Non-Cyclical Sports. Düzce Üniversitesi Spor Bilimleri Dergisi, Cilt: 6 Sayı: 2, 117–121. https://ajindex.com/articles/1668345

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