Isokinetic Strength Asymmetries of Trunk Rotation and Knee Joint in Adolescent Female Amateur Boxers: Implications for Injury Prevention
Liu Y, Xiao J, Chen Z. · Research Square · 2026
Abstract
Objective: To investigate bilateral asymmetries in trunk axial rotation and knee isokinetic strength among adolescent amateur female boxers and provide guidance for sport-specific training and injury prevention.
Methods: Sixteen adolescent female amateur boxers (age: 16.8 ± 1.8 years) were tested using the IsoMed 2000 isokinetic dynamometer. Concentric trunk rotation and knee concentric/eccentric strength were assessed at 60°/s, 120°/s, and 180°/s. Paired-samples t-tests and repeated-measures ANOVA were used for statistical analysis.
Results: Trunk rotation exhibited significant velocity-dependent asymmetry, with the left (dominant) side producing higher peak torque and total work than the right side at 120°/s and 180°/s (P
Conclusion: Adolescent amateur female boxers demonstrate notable asymmetries favoring the dominant side in trunk rotation and eccentric knee strength. These imbalances, together with relatively low lower-limb strength, may increase the risk of lumbar and knee injuries. Training programs should prioritize balanced bilateral trunk rotational strength, enhanced power production in the non-dominant limb, and optimization of the eccentric H/Q ratio to improve sport-specific performance and reduce injury risk.