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The effects of fatigue on lower limb biomechanics and kinetic stabilisation of the tuck jump assessment

journal contribution
posted on 2023-09-25, 13:33 authored by Lucy Kember, Gregory D. Myer, Izzy MooreIzzy Moore, Rhodri S. Lloyd

Context:General and local muscular fatigue is postulated to negatively alter lower limb biomechanics; however, few prospective studies have examined the effect of fatigue on tuck jump performance. The tuck jump assessment (TJA) is a criteria-based visual screening tool designed to identify neuromuscular deficits associated with ACL injury. Utilization of kinetics during the TJA following an intense sport-specific fatigue protocol may identify fatigue induced neuromuscular deficits associated with ACL injury risk.Objective:To examine the effects of a sport-specific fatigue protocol on visually evidenced (2D) technical performance of repeated tuck jumps and lower limb kinetic stabilisation.Design:Cross-sectional Study.Setting:Laboratory.Patients of Other Participants:Twelve recreational female athletes (age 20.8 ± 2.6 yrs; height 170.0 ± 0.04 m; body mass 67.5 ± 7.4 kg).Intervention(s):Sport-specific fatigue protocol.Main Outcome Measure(s):Paired t-tests and effect sizes were used to evaluate differences and magnitude of differences in TJA scoring criterion, kinetics, and kinetic stabilisation pre-to post-fatigue.Results:A moderate increase (p < 0.01; g = 0.45) was observed for relative leg stiffness (kleg) post-fatigue. Ground contact time, flight time, jump height, net impulse, and centre of mass displacement (p ≤ 0.02) decreased with small to moderate effect sizes (g = 0.41-0.74). No differences were observed for TJA composite scores, peak VGRF, and stabilisation indices of kinetic variables (p > 0.05) following the fatigue protocol.Conclusions:Kinetic analysis of repeated 26 tuck jumps following a fatigue protocol identified an altered jumping strategy, that was not identifiable via visual 2D assessment. However, based on kinetic measures, fatigue induces a stiffer jumping strategy and practitioners should consider assessing load attenuation strategies that may not be visually evident when evaluating ACL injury risk factors in athletes who are fatigued.



National Athletic Trainers' Associaton


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Kember, L.S., Myer, G.D., Moore, I.S. and Lloyd, R.S.,(2023) 'The effects of fatigue on lower limb biomechanics and kinetic stabilisation of the tuck jump assessment',. Journal of Athletic Training. doi: 10.4085/1062-6050-0252.23

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Cardiff Met Affiliation

  • Cardiff School of Sport and Health Sciences

Cardiff Met Authors

Lucy Kember Izzy Moore Isabel Moore Rhodri S. Lloyd

Cardiff Met Research Centre/Group

  • Applied Injury Science
  • Youth Physical Development

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  • © The Publisher


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