Triceps surae E.M.G. power spectrum changes during sustained submaximal isometric contractions at different muscle length

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Deutscher übersetzter Titel:Veraenderungen im EMG des M. triceps surae bei aufrechterhaltenen submaximalen isometrischen Kontraktionen bei verschiedenen Muskellaengen
Autor:Huijing, Peter A.; Adelerhof, Anja S.P.; Griesbergen, Rian; Woittiez, Reinout D.; Rijnsburger, Wim H.
Erschienen in:Electromyography and clinical Neurophysiology
Veröffentlicht:26 (1986), S. 181-192, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource
Sprache:Englisch
ISSN:0301-150X
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Erfassungsnummer:PU198807010788
Quelle:BISp

Abstract

Changes of E.M.G. power spectrum were assessed for superficial calf muscles of fifteen subjects, performing a submaximal isometric plantar flexion at three different knee and ankle angles. Mean power frequency (MPF) was estimated using an octave filter bank technique. Endurance time was significantly longer at the condition creating longest muscle lengths. At exhaustion a length related effect was found for changes of MPF at different muscle lengths conditions across the muscles studied: changes were significantly greater at long muscle lengths condition compared to intermediate and short muscle lengths conditions. This difference seems to be particularly influenced by the results for the medial head of m. gastrocnemius. No length effect could be shown if such a comparison was made at a time of exertion equal to the shortest time to exhaustion. It is concluded that the effect of different length conditions on MPF changes is not a direct effect of muscle length, but an effect related to differences of time to exhaustion. Not all subjects showed MPF shifts to lower values during exertion of plantar flexion moment in all conditions. It is concluded that this feature will severely hamper application of MPF as indicator of localized muscle fatigue in situations, where individual assessment of muscle functioning is indicated. Verf.-Referat