Differences in maximum voluntary excitation between isometric and dynamic contractions are age-dependent

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Deutscher übersetzter Titel:Unterschiede in der maximalen freiwilligen Erregung zwischen isometrischen und dynamischen Kontraktionen sind altersabhängig
Autor:Baggen, Remco J.; van Dieën, Jaap H.; Verschueren, Sabine M.P.; Roie, Evelien van; Delecluse, Christophe
Erschienen in:Journal of applied biomechanics
Veröffentlicht:35 (2019), 3, S. 196-201
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Elektronische Ressource (online) Gedruckte Ressource
Sprache:Englisch
ISSN:1065-8483, 1543-2688
DOI:10.1123/jab.2018-0215
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Erfassungsnummer:PU201908005968
Quelle:BISp

Abstract des Autors

Obtaining true maximum voluntary excitation appears to be more difficult in older populations than in young populations. The aims of this study were (1) to determine whether differences in maximum voluntary excitation obtained from maximum voluntary isometric contraction (MVIC) and (sub-)maximum voluntary dynamic contraction [(s-)MVDC] are age dependent, and (2) to determine how normalizing electromyographic signals to corresponding maximum voluntary excitations affects variance between participants and the likelihood of normalized signals exceeding 100%. MVIC, s-MVDC, and MVDC were recorded in 10 young women, and MVIC and s-MVDC were recorded in 19 older women. A significant age × contraction mode interaction effect was found for vastus lateralis (P = .04). In young women, MVDC elicited the highest maximum voluntary excitation for vastus lateralis and rectus femoris (P < .05). In older women, no differences in maximum voluntary excitation were found (P > .05). Normalization to dynamic contractions resulted in lower between-participant variance of electromyography amplitudes, though not for all muscles, and decreased the number of normalized signals exceeding 100% in young women. These findings indicate that differences in maximum voluntary excitation across contraction modes are age dependent. Therefore, one should be cautious when comparing normalized signals between age groups; however, overall dynamic contractions may be preferable over isometric contractions for normalization purposes.