Stevens claire


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Stevens claire

  1. 1. Initial contact Peak stance M male F female A anticipated U unanticipated Changes in lower limb landing biomechanics following a functional fatiguing programme: Contributions to anterior cruciate ligament injury Method • Five male and five female recreational athletes were recruited. Study Protocol: • Lower limb biomechanics were analysed two dimensionally at both the initial contact and peak stance phases of landing (figure 1). Figure 1. hip flexion (A), knee flexion (B), ankle dorsiflexion (C) and knee valgus (D). C D Results Jump landing task Training Session Jump landing task Dependent variable Fatigue Gender* Fatigue Landing* Fatigue Hip flexion M F A U Knee flexion Ankle DF Knee valgus Conclusions • The results of this study have highlighted the potential hazardous role of fatigue in inducing ACL injury risk positions. • As this is the first study that aimed to replicate game fatigue the results can be applied more confidently to an ACL prevention programme. • By exposing athletes to more complex movement tasks in training it may counter the deleterious impact of fatigue on movement patterns (Borotikar et al., 2008). Introduction • There are an estimated 80-100,000 ACL injuries occurring annually within the United States (Griffin et al., 2000). • This high frequency of ACL injuries still remains (Kernozek, Torry, and Iwasaki, 2008), highlighting that current prevention programmes may be excluding vital factors linked to the true mechanism of injury. • Literature has recently focussed on neuromuscular fatigue as a mechanism of ACL injury but all studies lack validity. • AIM: To examine the changes in lower limb biomechanics following a functional fatiguing programme. To examine if the changes differed between genders and between landing type when controlling for the stage of the hormonal cycle. References • Borotikar, B.S., Newcomer, R., Koppes, R. and McLean, S.G. (2008) Combined effects of fatigue and decisions making on female lower limb landing postures: central and peripheral contributions to ACL injury risk. Clinical Biomechanics, 23(1), pp. 81-92. • Griffin, L., Agel, J., Albolhm, M., Arendt, L., Ireland, M., Johnson, R., Kibler, B., Lephart, S., Lewis, J., Lindenfeld, T., Madelbaum, B., Marchak, P., Teitz, C. and Wojtys, E. (2000) Noncontact anterior cruciate ligament injuries: risk factors and prevention strategies. Journal of the American Academy of Orthopaedic Surgeons, 8(3), pp.141-50. • Kernozek, T.W., Torry, M.R. and Iwasaki, M. (2008) Gender differences in lower extremity landing mechanics caused by neuromuscular fatigue. The American Journal of Sports Medicine, 36(3), pp. 554-65. A B Fatigue increases ACL risk factors; prevention programmes need to incorporate fatigue into their strategies. Claire Stevens – Supervisor – Kevin Campbell-Karn