Effects of Exercise-Induced Neuromuscular Fatigue on Jump Performance and Lower-Limb Asymmetries in Youth Female Team Sport Athletes
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Faculty of Psychology, Education Sciences and Sport (FPCEE) Blanquerna, Ramon Llull University, Barcelona, Spain.
School of Health Sciences (FCS) Blanquerna, Ramon Llull University, Barcelona, Spain.
Segle XXI Female Basketball Team, Catalan Federation of Basketball, Esplugues de Llobregat, Spain.
Faculty of Science and Technology, London Sport Institute, Middlesex University, London, UK.
College of Health Solutions, Arizona State University, Phoenix, AZ, USA.
Submission date: 2022-10-02
Acceptance date: 2023-08-28
Online publication date: 2023-10-27
Corresponding author
Azahara Fort-Vanmeerhaeghe   

Sport Sciences, Faculty of Psychology, Education Sciences and Sport (FPCEE) Blanquerna, Ramon Llull University, Barcelona, Spain, Barcelona, Spain
Journal of Human Kinetics 2023;89:19–31
The objective of the present study was to examine the effect of acute neuromuscular fatigue on unilateral jump performance and inter-limb asymmetries. Thirty elite youth female team sport athletes (age: U-14 to U-18) performed the Unilateral Countermovement Jump (UCJ) and the Unilateral Drop Jump (UDJ) (18-cm box) tests before and approximately 10 minutes after the 30-15 intermittent fitness test (30-15 IFT). A paired samples t-test showed significant reductions in UCJ jump height in the right leg after the 30-15 IFT (p = 0.018; d = 0.33), but not in the left leg (p = 0.459; d = 0.48). For the UDJ, significant reductions in jump height were shown in both the right (p < 0.001; d = 0.33) and left (p < 0.001; d = 0.33) legs. In addition, for the reactive strength index (UDJ), significant reductions were seen in the left leg after the 30-15 IFT (p < 0.001; d = 0.31), but not in the right leg (p = 0.948; d < 0.001). Only UCJ inter-limb jump height asymmetries increased significantly post 30-15 IFT (p = 0.033; d = 0.46). In conclusion, the current study indicates that the 30-15 IFT provides a sufficient dose of activity for inducing acute fatigue in elite youth female team sport athletes. Therefore, monitoring jump height in unilateral jump testing is recommended given the tests’ sensitivity to detect significant differences in physical performance and inter-limb asymmetries under acutely fatigued conditions in healthy youth female athletes.
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