Contribution of components of the quadriceps femoris muscle for producing external torque in patients with patellofemoral pain syndrome |
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| Institution: | 1. Department of Physical Therapy, School of Science and Technology, Universidade Estadual Paulista (UNESP), Presidente Prudente, SP, Brazil;2. Department of Physical Therapy, UniAmérica Descomplica Centro Universitário, Foz do Iguaçu, Brazil;3. Centre for Sports and Exercise Medicine, School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom;4. Physical Therapy Department, Cascavel Educational Center, Cascavel, Brazil;5. La Trobe Sport and Exercise Medicine Research Centre, School of Allied Health, Human Services and Sport, La Trobe University, Melbourne, Australia;1. School of Kinesiology, Shanghai University of Sport, China;2. Research Institute for Sport and Exercise, University of Canberra, Australia;3. Faculty of Health, Art and Design, Swinburne University of Technology, Australia;4. Department of Sports Medicine, East Hospital, Tongji University, China;5. College of Rehabilitation Sciences, Shanghai University of Medicine and Health Sciences, China |
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| Abstract: | IntroductionDifferent muscular activities of the quadriceps components for producing necessary torque may change in patients with patellofemoral pain syndrome (PFPS). The aim of the current study, therefore, was to assess the contribution of each component of the quadriceps femoris muscle for producing external torque in patients with PFPS.MethodTwelve females with PFPS (24.7 ± 2.3 years) and twelve healthy matched females (25.4 ± 2.4 years) performed three consecutive knee flexion and extension movements with maximum effort at 45°/s and 300°/s using a Biodex system 3 dynamometer. Simultaneously, electromyographic (EMG) activities of the vastus medialis oblique (VMO), RF (rectus femoris) and vastus lateralis (VL) muscles were recorded using a DataLog instrument. Standard multiple regressions were used to assess the ability of EMG activities of the VMO, RF and VL muscles to predict normalized quadriceps femoris isokinetic concentric and eccentric torques at 45°/s and 300°/s in the normal and patient groups.ResultsIn the normal group, the VL and the VMO were the good predictors of quadriceps concentric torque at 45°/s and 300°/s, respectively. The VL and the RF were the good predictors of quadriceps eccentric torque at 300°/s in the patient group. No other conditions showed a considerable prediction for quadriceps torque in the normal or patient group.ConclusionFemales with PFPS differ with normal females in terms of the contribution of each component of the quadriceps femoris for producing external torque. Training the VMO for concentric contraction at both high and low velocities should be included in the management of the patients with PFPS. |
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| Keywords: | Electromyography Torque Quadriceps Prediction |
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