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Open AccessArticle

Effect of Fatigue on Electromyographic Activity Patterns of the Knee Joint Muscles in Anterior Cruciate Ligament Reconstructed and Deficient Patients during Landing Task

Department of health and sports medicine, Faculty of physical education and sports sciences, University of Tehran, 1417614418 Tehran, Iran
Neuromusculoskeletal research center, Iran University of Medical Sciences, 1449614535 Tehran, Iran
Department of Kinesiology, University of North Carolina at Charlotte, Charlotte, NC 28223, USA
Author to whom correspondence should be addressed.
J. Funct. Morphol. Kinesiol. 2018, 3(2), 22;
Received: 28 February 2018 / Revised: 1 April 2018 / Accepted: 3 April 2018 / Published: 5 April 2018
(This article belongs to the Special Issue Movement Analysis)
PDF [4273 KB, uploaded 3 May 2018]


Lower extremity fatigue causes a number of neuromuscular alterations that may increase the risk of knee (re)injury. It has therefore been suggested that fatigue-resistance training be incorporated into injury prevention and rehabilitation programs. The purpose of this study was to determine the effects of fatigue on knee-muscle activity patterns after anterior cruciate ligament injury (ACL). Twelve healthy, 12 ACL reconstructed (ACLR) and 12 ACL deficient (ACLD) recreationally active male volunteers participated in this case-control study. Fatigue was induced via repetitive sets of double-leg squats and drop landings. Muscle activity was assessed via surface electromyography during a single-leg drop landing task pre- and post-fatigue. After fatigue, medial hamstring, lateral hamstring and vastus lateralis muscles turned on significantly earlier in ACLR compared to the control group. Significantly greater vastus medialis muscle activity was observed in ACLD compared to ACLR and control participants post-fatigue. Finally, fatigue decreased lateral gastrocnemius muscle activity in ACLD and control participants. It seems ACLR patients rely on earlier muscle pre-activation to establish knee joint stability upon landing after fatigue. This feed-forward strategy should be emphasized during post-operative rehabilitation in ACLR patients. Furthermore, according to our results, quadriceps and gastrocnemius muscles play an important role in establishing knee joint stability post impact in ACLD patients. View Full-Text
Keywords: knee; injury; neuromuscular control; rehabilitation knee; injury; neuromuscular control; rehabilitation

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Dashti Rostami, K.; Alizadeh, M.H.; Minoonejad, H.; Yazdi, H.; Thomas, A. Effect of Fatigue on Electromyographic Activity Patterns of the Knee Joint Muscles in Anterior Cruciate Ligament Reconstructed and Deficient Patients during Landing Task. J. Funct. Morphol. Kinesiol. 2018, 3, 22.

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