The effect of leg kicking exercise on the hip and knee isokinetic strength and maximal kicking speed in young soccer players

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Abstract
Background: Maximal kicking performance relies heavily on the coordinated involvement of the hip flexors and knee extensors, yet exercises that specifically target these muscle groups are rarely prioritized in soccer training regimens. Objective: This study aimed to examine the effects of a leg-kicking exercise program (LKE) on the kicking speed, sprint performance, and agility of young players. Methods: Thirty-nine youth players were randomly assigned to either an LKE group (n = 18; 15.9 ± 0.9 years) or a control group (n = 21; 15.8 ± 0.6 years). The LKE group performed a leg-kicking exercise three days a week. The participants underwent body composition analysis, isometric knee, isokinetic knee and hip strength tests, maximal ball speed, linear sprint, and agility tests at baseline and post-intervention. Results: In the LKE group, muscle mass, maximal ball speed in both legs, and both isometric and isokinetic strength significantly increased (p < 0.05), while agility and sprint performance showed no significant changes (p > 0.05). Conclusion: A 6-week LKE program, in addition to soccer training, may enhance kicking speed in youth players. The LKE may serve as a practical alternative to traditional strength training for improving muscle strength and kicking performance.

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