Knee kinematics is altered post-fatigue while performing a crossover task
- 446 Downloads
To examine the effect of a sequential fatigue protocol on lower extremity biomechanics during a crossover cutting task in female soccer players.
Eighteen female collegiate soccer players alternated between a fatigue protocol and two consecutive unanticipated crossover trials until fatigue was reached. Lower extremity biomechanics were evaluated during the crossover using a 3D motion capture system and two force plates. Repeated-measures ANOVAs analysed differences between three sequential stages of fatigue (pre, 50, 100 %) for each dependent variable (α = 0.05).
Knee flexion angles at initial contact (IC) for pre (−32 ± 9°) and 50 % (−29 ± 11°) were significantly higher than at 100 % fatigue (−22 ± 9°) (p < 0.001 and p = 0.015, respectively). Knee adduction angles at IC for pre (9 ± 5°) and 50 % (8 ± 4°) were significantly higher (p = 0.006 and p = 0.049, respectively) than at 100 % fatigue (6 ± 4°).
Fatigue altered sagittal and frontal knee kinematics after 50 % fatigue whereupon participants had diminished knee control at initial contact. Interventions should attempt to reduce the negative effects of fatigue on lower extremity biomechanics by promoting appropriate frontal plane alignment and increased knee flexion during fatigue status.
Level of evidence
KeywordsKinematics ACL injury Knee Female Soccer Decision-making
The authors gratefully acknowledge the research support from National Institute of Health (1R03AR054031-01, 1R01AR062578-01) and the Portuguese Foundation for Science and Technology (SFRH/BD/28046/2006).
- 12.Dempster WT (1955) Space requirements of the seated operator. Wright Air Dev Center Tech Rep 55159:55–159Google Scholar
- 15.Griffin LY, Agel J, Albohm MJ, Arendt EA, Dick RW, Garrett WE, Garrick JG, Hewett TE, Huston L, Ireland ML, Johnson RJ, Kibler WB, Lephart S, Lewis JL, Lindenfeld TN, Mandelbaum BR, Marchak P, Teitz CC, Wojtys EM (2000) Noncontact anterior cruciate ligament injuries: risk factors and prevention strategies. J Am Acad Orthop Surg 8(3):141–150PubMedGoogle Scholar
- 16.Griffin LY, Albohm MJ, Arendt EA, Bahr R, Beynnon BD, Demaio M, Dick RW, Engebretsen L, Garrett WE Jr, Hannafin JA, Hewett TE, Huston LJ, Ireland ML, Johnson RJ, Lephart S, Mandelbaum BR, Mann BJ, Marks PH, Marshall SW, Myklebust G, Noyes FR, Powers C, Shields C Jr, Shultz SJ, Silvers H, Slauterbeck J, Taylor DC, Teitz CC, Wojtys EM, Yu B (2006) Understanding and preventing noncontact anterior cruciate ligament injuries: a review of the Hunt Valley II meeting, January 2005. Am J Sports Med 34(9):1512–1532PubMedCrossRefGoogle Scholar
- 17.Hewett TE, Myer GD, Ford KR, Heidt RS Jr, Colosimo AJ, McLean SG, van den Bogert AJ, Paterno MV, Succop P (2005) Biomechanical measures of neuromuscular control and valgus loading of the knee predict anterior cruciate ligament injury risk in female athletes: a prospective study. Am J Sports Med 33(4):492–501PubMedCrossRefGoogle Scholar
- 18.Isaacs L, Pohlman E (1991) Effects of exercise intensity on an accompanying timing task. J Human Mov Stud 20:123–131Google Scholar
- 36.Yu B, Gabriel D, Noble L, An K (1999) Estimate of the optimum cutoff frequency for the Butterworth low-pass digital filter. J Appl Biomech 15(3):318–329Google Scholar