Muscle fatigue during repetitive voluntary contractions: A comparison between children with cerebral palsy,typically developing children and young healthy adults |
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| Authors: | M.M. Eken A.J. Dallmeijer H. Houdijk C.A.M. Doorenbosch |
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| Affiliation: | 1. Department of Rehabilitation Medicine, MOVE Research Institute, VU University Medical Centre, Amsterdam, The Netherlands;2. Department of Research and Development, Rehabilitation Centre Heliomare, Wijk aan Zee, The Netherlands;3. MOVE Research Institute Amsterdam, Faculty of Human Movement Sciences, VU University, Amsterdam, The Netherlands;4. Academy of Human Kinetic Technology, The Hague University of Applied Sciences, The Hague, The Netherlands;1. Nuffield Orthopaedic Centre, Oxford University Hospitals NHS Trust, Windmill Rd, Headington, Oxford OX3 7HE, UK;2. Copenhagen University Hospital, Kettegaard Alle 30, 2650 Hvidovre, Denmark;1. Laboratoire TIMC-IMAG, UMR UJF CNRS 5525, Équipe Santé-Plasticité-Motricité, Université Grenoble 1, F-38041, France;2. Unité 1093, Cognition, Action et Plasticité Sensorimotrice, Institut National de la Santé et de la Recherche Médicale (INSERM), Dijon, France;3. Clinique MPR CHU Grenoble, Laboratoire TIMC-IMAG, UMR UJF CNRS 5525, Équipe Santé-Plasticité-Motricité, Université Grenoble 1, F-38041, France;1. Department of Veterans Affairs (VA), Rehabilitation Research and Development Center of Excellence for Limb Loss Prevention and Prosthetic Engineering, Seattle, WA 98108, United States;2. Department of Rehabilitation Medicine, University of Washington, Seattle, WA 98195, United States;3. Department of Human Physiology, University of Oregon, Eugene, OR 97403, United States;4. Wallace H. Coulter Department of Biomedical Engineering, Emory University and Georgia Institute of Technology, Atlanta, GA 30332, United States;1. Movement Analysis Laboratory, Istituto Ortopedico Rizzoli, Bologna, Italy;2. Department of Orthopaedic Surgery, Istituto Ortopedico Rizzoli, Bologna, Italy;1. School of Physiotherapy, The University of Notre Dame Australia, Fremantle, WA, Australia;2. School of Physiotherapy, Curtin University, Perth, WA, Australia |
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| Abstract: | AimTo combine peak torque and EMG analyses to investigate the hypothesis that 1) children with cerebral palsy (CP) have lower muscle fatigability than typically developing children (TD) and whether 2) muscle fatigue correlates with muscle strength.MethodsSeven CP children, eight TD children and ten young healthy adults (YHA) performed an all-out fatigue test of 35 maximal concentric knee extension and flexion contractions on an isokinetic dynamometer. Angular velocity was set at 60°/s. Peak torque (PT) was determined per repetition and either normalized to bodyweight or maximum voluntary torque. Surface-EMG of quadriceps and hamstring muscles was measured to obtain changes in median frequency (EMG-mf) and smooth rectified EMG amplitude per contraction.ResultsDecline in PT differed between all groups for extensors and flexors, where YHA showed the largest decline and CP children the smallest decline over the course of the test. YHA showed a larger decline in EMG-mf of all quadriceps and hamstrings than TD and CP children, while TD children showed a larger decline in EMG-mf of m.rectus femoris and m.vastus lateralis than CP children.InterpretationResults confirm that children with CP show lower fatigability than TD children and that the lower fatigability coincides with lower maximal muscle strength. |
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| Keywords: | Cerebral palsy Muscle fatigue Muscle strength Dynamometer Electromyography |
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