Relationships among Isokinetic Knee Strength, Anaerobic Power, and Vertical Jump Performance in Professional Male Volleyball Players

Profesyonel Voleybolcularda İzokinetik Kuvvet, Anaerobik Güç ve Dikey Sıçrama İlişkisi

Utku Gönener¹ Ahmet Gönener²

*Correspondence: Utku Gönener Kocaeli University Faculty of Sport Sciences utku.gonener@kocaeli.edu.tr
Orcid: 0000-0002-6152-3353

¹ Kocaeli University Faculty of Sport Sciences, Orcid: 0000-0002-6152-3353
² Kocaeli University Faculty of Sport Sciences, ahmet.gonener@kocaeli.edu.tr Orcid: 0000-0003-3766-1016

Doi: https://doi.org/10.5281/zenodo.18879665

https://www.ijoss.org/Archive/v3-i1/ijoss-Volume3-issue1-10.pdf

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Received / Gönderim: 31.11.2025 Accepted / Kabul: 19.02.2026 Published / Yayın: 28.02.2026

Abstract

The purpose of this study is to examine the relationship between isokinetic strength and anaerobic power as well as vertical jump in professional male volleyball players. Twenty-two professional male volleyball players participated in this study.  Isokinetic strength of the knee extensor and flexor muscles was measured at an angular velocity of 60°/s. Anaerobic power was evaluated using the Wingate anaerobic power test and vertical jump performance was evaluated through the countermovement jump test. A strong positive significant correlation was found between vertical jump height and right leg extension strength while moderate positive correlation was found between with left leg extension strength. A highly positive significant correlation was found between vertical jump height and right and left leg flexion strengths. A moderate level of positive significant correlation was found between vertical jump height and right and left leg Hamstring/Quadriceps(H/Q) ratios. A highly positive significant correlation was found between Wingate anaerobic peak power and vertical jump height. In addition, significant positive correlations were identified between Wingate anaerobic peak power and Wingate anaerobic mean power and the 60°/s right and left leg extension and flexion peak torque values, while no significant correlations were found between right–left leg extension or flexion peak torque differences and Wingate anaerobic peak power. The findings revealed strong positive correlations between isokinetic strength, Wingate anaerobic peak power output (W), and vertical jump height in volleyball players.

Keywords Isokinetic strength, Anaerobic power, Vertical Jump, Biodex, Wingate.

Öz

Bu çalışmanın amacı, profesyonel erkek voleybolcularında izokinetik kuvvet ve anaerobik güç ile dikey sıçrama arasındaki ilişkiyi incelemektir. Çalışmaya yirmi iki profesyonel erkek voleybolcu katılmıştır. Diz ekstansör ve fleksör kaslarının izokinetik gücü 60°/s açısal hızda ölçülmüştür. Anaerobik güç Wingate anaerobik güç testi ile değerlendirilmiş, dikey sıçrama performansı ise karşı hareket sıçrama testi ile değerlendirilmiştir.  Dikey sıçrama yüksekliği ile sağ bacak ekstansiyon kuvveti arasında güçlü pozitif ve anlamlı bir korelasyon bulunurken, sol bacak ekstansiyon gücü ile orta düzeyde pozitif ve anlamlı bir korelasyon saptanmıştır. Dikey sıçrama yüksekliği ile sağ ve sol bacak fleksiyon güçleri arasında yüksek düzeyde pozitif ve anlamlı korelasyonlar tespit edilmiştir. Dikey sıçrama yüksekliği ile sağ ve sol bacak Hamstring/Quadriceps (H/Q) oranları arasında orta derecede pozitif anlamlı korelasyonlar bulunmuştur. Wingate anaerobik zirve gücü ile dikey sıçrama yüksekliği arasında yüksek düzeyde pozitif ve anlamlı korelasyon bulunmuştur. Ayrıca, Wingate anaerobik zirve gücü ile Wingate anaerobik ortalama güç değerleri ile 60°/s sağ ve sol bacak ekstansiyon ve fleksiyon zirve tork değerleri arasında anlamlı pozitif korelasyonlar tespit edilirken, sağ-sol bacak ekstansiyon veya fleksiyon zirve tork farkları ile Wingate anaerobik zirve gücü arasında anlamlı bir ilişki belirlenmemiştir.  Sonuçlar, voleybol oyuncularında izokinetik kuvvet, Wingate anaerobik zirve gücü (W) ve dikey sıçrama yüksekliği arasında güçlü pozitif korelasyonlar olduğunu ortaya koymuştur.

Anahtar Kelimeler İzokinetik kuvvet, Anaerobik güç, Dikey sıçrama, Biodex, Wingate

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