Comparison of isokinetic knee muscular strength, jump performance, and hormone levels in female adolescent voleyball players of different ages

Abstract

Purpose: The aim of this study was to evaluate and compare the relationships between knee muscular strength, jump performance and hormone levels among female adolescent volleyball players of different ages. Methods: Sixty adolescent female volleyball players were divided into two groups according to age: those with an age between 11-13 years constituted; Group 1 (N=29) and those with an age between 14-16 years constituted; Group 2 (N=31). Jump performance assessed using one-leg hop test and vertical jump test, bilateral isokinetic knee strength by isokinetic dynamometer and concentrations of oestrogen and prolactin via radioimmunoassay and enzyme-linked immunoassay. Results: Group 1 had greater distance trend during one leg hop test performance than Group 2. There were no significant differences in symmetry index of jump performances between groups (p>0.05). While Group 2 had significantly greater concentric knee extension contractions; Group 1 had significantly greater concentric knee flexion contractions in peak torque, peak work and total work values (p<0.05). Oestrogen level of Group 2 was significantly higher than Group 1 (p<0.05). Conclusion: Physiotherapists should take into account variability for muscular strength, jump performance and hormone levels while planning exercise regimes female adolescent volleyball players of various ages

Keywords

• Muscle strength
• Hormone
• Adolescent
• Volleyball

Farklı yaş gruplarındaki bayan adölesan voleybol oyuncularında izokinetik kas kuvveti, sıçrama performansı ve hormon seviyelerinin karşılaştırılması

Öz

Amaç: Farklı yaş gruplarındaki bayan adölesan voleybol oyuncularında diz kas kuvveti, sıçrama performansı ve hormon seviyeleri arasındaki ilişkiyi incelemek ve karşılaştırmaktır. Yöntem: Altmış bayan adölesan voleybol oyuncusu 11-13 yaş arası Grup 1 (N=29) ve 14-16 yaş arası Grup 2 (N=31) olmak üzere iki gruba ayrıldı. Sıçrama performansı, tek bacak üzerinde sıçrama ve dikey sıçrama testi ile, bilateral izokinetik kas kuvveti izokinetik dinamometre ile, östrojen ve prolaktin konsantrasyonları ise radioimmunoassay ve enzime bağlı immunoassay ile değerlendirildi. Sonuçlar: Grup 1, tek bacak üzerinde sıçrama testi performansında Grup 2’den daha fazla sıçrama eğilimindeydi. Gruplar arasında sıçrama performansı simetri indeksi açısından anlamlı fark yoktu (p>0.05). Konsentrik diz ekstansiyon kontraksiyonları açısından Grup 2 daha iyiyken; zirve tork, zirve iş ve toplam iş değerleri açısından Grup 1 daha yüksek konsentrik diz fleksiyon kontraksiyonlarına sahipti (p<0.05). Grup 2’deki östrojen seviyesi Grup 1’dekinden daha yüksekti (p<0.05). Tartışma: Fizyoterapistler, farklı yaş gruplarındaki bayan adölesan voleybol oyuncularında egzersiz rejimlerini planlarken kas kuvveti, sıçrama performansı ve hormon seviyeleri açısından var olması beklenen farklılıkları göz önünde bulundurmalıdır

Anahtar Kelimeler

• Kas kuvveti
• Hormon
• Adölesan
• Voleybol

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