Isokinetic and Isometric Assessment of the Knee Joint Extensors and Flexors of Professional Volleyball Players

Purpose: The main objective of this study was to evaluate the level of muscle strength by using isokinetic and isometric measurements—more specifically, the force ratio between the knee flexors and extensors (values of the torques). Methods: An experimental group of elite volleyball players (n = 14)...

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Published in:International journal of environmental research and public health 2021-06, Vol.18 (13), p.6780
Main Authors: Wilkosz, Piotr, Kabacinski, Jaroslaw, Mackala, Krzysztof, Murawa, Michal, Ostarello, John, Rzepnicka, Agata, Szczesny, Lukasz, Fryzowicz, Anna, Maczynski, Jacek, Dworak, Lechoslaw B.
Format: Article
Language:English
Subjects:
Angular velocity
Athletes
Dynamic stability
Experiments
Flexors
Injuries
Injury prevention
Joints (anatomy)
Knee
Laboratories
Medical research
Muscle contraction
Muscle strength
Muscles
Physical education
Physical training
Players
Resistance training
Stability analysis
Torque
Volleyball
Warm up (exercise)
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Summary:Purpose: The main objective of this study was to evaluate the level of muscle strength by using isokinetic and isometric measurements—more specifically, the force ratio between the knee flexors and extensors (values of the torques). Methods: An experimental group of elite volleyball players (n = 14) were compared to a control group (n = 14) of healthy non-athletes of comparable ages. Torque measurements were obtained under three concentric conditions (angular velocities of 60 °/s, 180 °/s, and 300 °/s) and one static condition by utilizing the Biodex System 3. Results: In all trials, the volleyball players achieved significantly higher peak torque (PT) values for both the extensors and flexors (p < 0.05) than those of the control group. However, the strength ratio of the flexors and extensors (H/Q) in the experimental group was only 83% of the standard reported in the literature. The most developed and dominating muscles in the knee joints of the volleyball players were the extensors, which accounted for the low strength ratio and dynamic instability of this joint. Conclusion: Based on a proper assessment of the strength ratio of the knee flexors and extensors, properly selected and implemented resistance training can improve the maximum strength and power production and reduce the incidence of injuries in volleyball.
ISSN:1660-4601
1661-7827
1660-4601
DOI:10.3390/ijerph18136780