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Effect of posterior cruciate ligament creep on muscular co-activation around knee: A pilot study |
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| Affiliation: | 1. Biomechanics Laboratory, College of Physical Education, Shandong Normal University, 88 Wenhua East Road, Jinan, Shandong 250014, China;2. Biomechanics Laboratory, Shandong Research Center of Sports Science, Jinan 250000, China;1. Neuromechanics Laboratory, Department of Health, Sport and Exercise Sciences, University of Kansas, Lawrence, KS, United States;2. Applied Physiology Laboratory, Department of Health, Sport and Exercise Sciences, University of Kansas, Lawrence, KS, United States;1. Research Organization of Science and Technology, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan;2. Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-8472, Japan;3. Graduate School of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan;4. National Institute of Fitness and Sports in Kanoya, 1 Shiromizu, Kanoya, Kagoshima 891-2393, Japan;5. Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan;1. Neuromuscular Research Laboratory, Schulthess Clinic, Zurich, Switzerland;2. Institute of Human Movement Sciences and Sport, ETH, Zurich, Switzerland;3. Laboratory of Human Motricity, Education, Sport and Health (LAMHESS) – EA 6309, University of Nice Sophia Antipolis, Nice, France;4. INSERM U1093 – Cognition, Action and Sensory Plasticity, University of Burgundy, Dijon, France;1. Department of Mechanical and Materials Engineering, Queen׳s University, McLaughlin Hall, Kingston, Ontario, Canada K7L 3N6;2. Department of Mechanical Engineering, University of Wisconsin-Madison, WI 53706, USA |
| Abstract: | The effect of posterior cruciate ligament (PCL) on muscle co-activation (MCO) is not known though MCO has been extensively studied. The purpose of the study was to investigate the effect of PCL creep on MCO and on joint moment around the knee. Twelve males and twelve females volunteered for this study. PCL creep was estimated via tibial posterior displacement which was elicited by a 20 kg dumbbell hanged on horizontal shank near patella for 10 min. Electromyography activity from both rectus femoris and biceps femoris as well as muscle strength on the right thigh was recorded synchronically during knee isokinetic flexion–extension performance in speed of 60 deg/s as well as 120 deg/s on a dynamometer before and after PCL creep. A one-way ANOVA with repeated measures was used to evaluate the effect of creep, gender and speed. The results showed that significant tibial posterior displacement was found (p = 0.01) in both male and female groups. No significant increase of joint moment was found in flexion as well as in extension phase in both female and male groups. There was a significant effect of speed (p = 0.036) on joint moment in extension phase. Co-activation index (CI) decreased significantly (p = 0.049) in extension phase with a significant effect of gender (p ⩽ 0.001). It was concluded that creep developed in PCL due to static posterior load on the proximal tibia could significantly elicit the increase of the activation of agonist muscles but with no compensation from the antagonist in flexion as well as in extension phase. The creep significantly elicited the decrease of the antagonist–agonist CI in extension phase. MCO in females was reduced significantly in extension phase. It was suggested that PCL creep might be one of risk factors to the knee injury in sports activity. |
| Keywords: | Posterior cruciate ligament Creep Muscle co-activation Knee Agonist Antagonist |
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