ORIGINAL RESEARCH article
Front. Sports Act. Living
Sec. Exercise Physiology
Volume 7 - 2025 | doi: 10.3389/fspor.2025.1627059
Relationship between knee isokinetic muscle strength and countermovement jump height among elite male gymnasts
Provisionally accepted
- 1Shanghai University of Sport, Shanghai, China
- 2Ludong University School of Physical Education, Shandong, shandong, China
- 3Dalian University college of physical education, liaoning, China
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This study quantifies the isokinetic knee strength of elite male gymnasts and examines 5 the relationship between concentric extensor strength, limb asymmetry, and 6 countermovement jump (CMJ) height. A total of 18 elite male gymnasts participated 7 in isokinetic strength testing, assessing concentric and eccentric actions during both 8 extension and flexion of the knee at joint angular velocities of 60°/s, 180°/s, and 9 240°/s. Relative peak torque (RPT) of the knee flexors and extensors, the functional 10 eccentric hamstring/concentric quadriceps (Hecc/Qcon) ratio, and the inter-limb 11 asymmetries were analyzed. CMJ height was assessed using a contact mat, and the 12 relationship between concentric extensor RPT and limb asymmetries with CMJ height 13 was analyzed using Pearson correlation coefficients analysis. Results indicate that at 14 an angular velocity of 180°/s, both an abnormal limb asymmetries in the concentric 15 extensors was observed and the strongest negative correlation with CMJ height (r = 16 -0.638, p<0.05) was found. At an angular velocity of 240°/s, knee extensor strength 17 demonstrated the strongest correlation with CMJ height (r = 0.962, P < 0.001). 18 Therefore, we recommend that gymnasts conduct regular isokinetic strength 19 assessments, particularly focusing on concentric knee extensor strength and limb 20 asymmetries, as they exhibit moderate to high correlations with CMJ height.
Keywords: Muscle Strength, muscle balance, Vertical jump, hamstring to quadricepsratio, Limb asymmetries
Received: 06 Jun 2025; Accepted: 18 Aug 2025.
Copyright: © 2025 Ma, Zhou, Jin, Wang and Chen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Chao Chen, Dalian University college of physical education, liaoning, China
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