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AmirAli Jafarnezhadgero, Morteza Madadi-Shad, Christopher McCrum and Kiros Karamanidis

lower disability score and lower static knee joint valgus alignment after corrective training may indicate that the corrective training enabled more effective bilateral drop landing. This may be explained by the increased degrees of hip flexion in the EG (see Figure  3 ), as well as potentially less co-contraction

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Christie Powell, Jody Jensen and Samantha Johnson

et al 43 (16–30) y/male ACLR (1) SLHD (2) Co-contraction agility test (3) Carioca test (4) Shuttle run (20 ft × 4 s) Retrospective comparative study Level 3 N = 67 Paterno et al 44 10–25 y male/female ACLR; healthy subjects (1) DVJ (30-cm box) (LSI % calculated) Controlled laboratory Cross

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Nicole C. George, Charles Kahelin, Timothy A. Burkhart and David M. Andrews

. 2002 ; 35 : 639 – 647 . PubMed doi:10.1016/S0021-9290(01)00243-3 10.1016/S0021-9290(01)00243-3 11955503 7. Yeadon MR , King MA , Forrester SE , Caldwell GE , Pain MTG . The need for muscle co-contraction prior to a landing . J Biomech

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Jonathan S. Goodwin, Robert A. Creighton, Brian G. Pietrosimone, Jeffery T. Spang and J. Troy Blackburn

.1097/00003086-200006000-00022 10853168 14. Collins A , Blackburn JT , Olcott C , Yu B , Weinhold P . The impact of stochastic resonance electrical stimulation and knee sleeve on impulsive loading and muscle co-contraction during gait in knee osteoarthritis . Clin Biomech . 2011 ; 26 ( 8 ): 853 – 858 . PubMed ID

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Joerg Teichmann, Rachel Tan, Kim Hébert-Losier, Yeo Wee Kian, Shabana Jalal Din, Ananthi Subramaniam, Dietmar Schmidtbleicher and C. Martyn Beaven

Sci Sports . 2011 ; 21 ( suppl 1 ): 62 – 68 . doi: 10.1111/j.1600-0838.2011.01343.x 21679325 22. Chmielewski TL , Hurd WJ , Rudolph KS , Axe MJ , Snyder-Mackler L . Perturbation training improves knee kinematics and reduces muscle co-contraction after complete unilateral anterior

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Remco J. Baggen, Jaap H. van Dieën, Sabine M. Verschueren, Evelien Van Roie and Christophe Delecluse

measurements are difficult to obtain and are subject to effects of co-contraction of synergistic and antagonistic muscles that modulate the net force produced. 2 However, the absolute value of surface EMG signals (obtained in V or mV) can be affected by many factors, such as variation in EMG electrode

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Fabian Mager, Jim Richards, Malika Hennies, Eugen Dötzel, Ambreen Chohan, Alex Mbuli and Felix Capanni

. 1998 ; 85 ( 3 ): 1044 – 1055 . PubMed ID: 9729582 doi:10.1152/jappl.1998.85.3.1044 9729582 10.1152/jappl.1998.85.3.1044 4. Apps C , Sterzing T , Brien TO , Lake M . Lower limb joint stiffness and muscle co-contraction adaptations to instability footwear during locomotion . J Electromyogr

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Chen Deng, Jason C. Gillette and Timothy R. Derrick

, Gillette JC . Muscle activity amplitudes and co-contraction during stair ambulation following anterior cruciate ligament reconstruction . J Electromyogr Kinesiol . 2015 ; 25 : 298 – 304 . doi:10.1016/j.jelekin.2015.01.007 10.1016/j.jelekin.2015.01.007 25716325 26. Delp SL , Maloney W . Effects

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Gregory S. Walsh, Daniel C. Low and Marco Arkesteijn

, Latash ML . Unintentional drifts during quiet stance and voluntary body sway . Exp Brain Res . 2017 ; 235 ( 7 ): 2301 – 2316 . PubMed ID: 28477042 doi:10.1007/s00221-017-4972-x 10.1007/s00221-017-4972-x 28477042 25. Falconer K , Winter DA . Quantitative assessment of co-contraction at the

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Alison R. Oates, Aaron Awdhan, Catherine Arnold, Joyce Fung and Joel L. Lanovaz

indicators of co-contraction . Journal of Electromyography and Kinesiology, 22 ( 4 ), 607 – 611 . PubMed ID: 22382273 doi: 10.1016/j.jelekin.2012.02.001 Maki , B.E. ( 1997 ). Gait changes in older adults: Predictors of falls or indicators of fear? Journal of the American Geriatrics Society, 45