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Muscle performance during maximum repeated knee extensions in children with hemiplegic cerebral palsy
Linköping University, Department of Clinical and Experimental Medicine, Rehabilitation Medicine. Linköping University, Faculty of Health Sciences.
Department of Biomedical Engineering and Informatics, Umeå University Hospital, Umeå, Sweden.
Linköping University, Department of Clinical and Experimental Medicine, Rehabilitation Medicine. Östergötlands Läns Landsting, Centre for Medicine, Pain and Rehabilitation Centre. Linköping University, Faculty of Health Sciences.
2008 (English)In: Isokinetics and exercise science, ISSN 0959-3020, E-ISSN 1878-5913, Vol. 16, no 4, 221-230 p.Article in journal (Refereed) Published
Abstract [en]

The aim of the present study was to compare isokinetic muscle performance of the knee extensors including surface EMG during repetitive maximum contractions between children with hemiplegic CP and healthy controls. A group of children with hemiplegic cerebral palsy (CP) (16 boys and eight girls; mean age 11 years with SD 2; range 7 to 15 years) and a control group (14 boys and eight girls; mean age 10 years with SD 2; range 7 to 15 years) participated. The relationships between maximum peak torque and the surface electromyography (EMG) variable root mean square (RMS) were obtained during 100 concentric knee extensions at 90°/s. Surface EMG was recorded from rectus femoris, vastus lateralis, and biceps femoris. The children with CP were also tested using Gross Motor Function Measure (GMFM). There were no differences between the groups in muscle endurance for the younger children. The results indicated that the children with CP had less strength enhancement in the hemiplegic leg during puberty. Peak torque correlated with GMFM and with RMS in rectus femoris and vastus lateralis. Co-activation was found in biceps femoris, but it did not affect muscle strength.

Place, publisher, year, edition, pages
2008. Vol. 16, no 4, 221-230 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-16531OAI: oai:DiVA.org:liu-16531DiVA: diva2:158145
Available from: 2009-01-30 Created: 2009-01-30 Last updated: 2017-12-14
In thesis
1. Evaluation of surface electromyography and aspects of muscle strength in persons without motor impairment and in children with hemiplegic cerebral palsy
Open this publication in new window or tab >>Evaluation of surface electromyography and aspects of muscle strength in persons without motor impairment and in children with hemiplegic cerebral palsy
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Impaired muscle function significantly affects persons with Cerebral Palsy (CP), affects that include muscle strength, fatigue and endurance. This thesis evaluates a test method, an endurance test, and estimates aspects of muscle fatigue and muscle endurance in persons without impaired muscle function and in children with CP. The test is preformed during dynamic movements and uses an isokinetic dynamometer and surface electromyography (SEMG). In persons without muscle impairment, muscle strength variables with simultaneous SEMG recordings during fatigue knee extensions test are evaluated with respect to reliability and validity. The endurance test consisted of 100 concentric maximum muscle contractions. SEMG were investigated in the agonist and the antagonist muscle. The SEMG variables mean frequency (MNF) and root mean square (RMS) were calculated. The relationship between maximal muscle strength variables, SEMG, and muscle morphology were investigated in healthy participants during plantar flexions. Muscle strength, muscle fatigue, and muscle endurance in children with CP, and in a control group, were examined together with SEMG recordings during knee extensions. Activity level in the children with CP was estimated using Gross Motor Function Measure (GMFM) and Gross Motor Function Classification System (GMFCS).

In healthy young and middle-aged subjects, it is highly reliable to test concentric muscle strength and endurance with isokinetic dynamo meters at moderate movement velocity. The reliability was high for the SEMG variables MNF and RMS of the agonist but low for the antagonist muscle. MNF is the SEMG variable describing fatigue with respect to the decrease in peak torque during repeated maximum concentric dynamic contractions. MNF correlated with the fibre area and the proportion of Type I muscle fibres during the endurance test of plantar flexors. Area of Type II muscle fibres and sex were the most important factors contributing to muscle strength during plantar flexion. The Proportion of Type I muscle fibres and area of Type I were the most important factors for high muscle endurance level.

Generally, the affected leg in children with hemiplegic CP was significantly weaker than the less-affected leg, and RMS values were higher for the agonists of the less-affected leg than for the affected leg. The children were divided in two groups, a younger and an older group. At the endurance level, the younger children with hemiplegic CP were as strong as the young children in the control group and there were no difference between the affected and the less affected leg. The older children with CP had impaired maximum muscle strength and endurance strength compared to the control group. The children with CP did not improve strength with increasing age; instead, high values of GMFM correlated with muscle strength.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2005. 58 p.
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 882
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-29556 (URN)14928 (Local ID)91-7373-860-3 (ISBN)14928 (Archive number)14928 (OAI)
Public defence
2005-02-04, Berzeliussalen, Hälsouniversitetet, Linköping, 13:00 (Swedish)
Opponent
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2012-09-28Bibliographically approved

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Larsson, BarbroGerdle, Björn

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