Human muscle energetics during voluntary and electrically induced isometric contractions as measured by 31P NMR spectroscopy

Gespeichert in:
Bibliographische Detailangaben
Deutscher übersetzter Titel:Energiestoffwechsel im menschlichen Muskel bei willkuerlichen und elektrisch stimulierten isometrischen Kontraktionen, gemessen mit Hilfe der 31P-Magnetresonanzspektroskopie
Autor:Vanderthommen, M.; Gilles, R.; Carlier, P.; Ciancabilla, F.; Zahlan, O.; Sluse, F.; Crielaard, J.M.
Erschienen in:International journal of sports medicine
Veröffentlicht:20 (1999), 5, S. 279-283, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:0172-4622, 1439-3964
DOI:10.1055/s-2007-971131
Schlagworte:
Online Zugang:
Erfassungsnummer:PU199908401134
Quelle:BISp

Abstract des Autors

Electrical stimulation (ES) and voluntary contraction (VC) were compared in the quadriceps muscle of ten male volunteers. In both modes, a workload corresponding to 20% of maximal voluntary contraction was applied during 64 isometric contraction (5.5 s)-relaxation (5.5 s) cycles. The protocols were performed in a 1.5 T whole-body magnet. The Pi/PCr ratio and the intracellular pH (pHi) were monitored by 31P NMR spectroscopy during baseline, exercise and recovery periods, in a superficial region of the vastus medialis. During baseline, the Pi/PCr ratio (0.12 vs. 0.10) and the pHi (7.01 vs. 7.00) were comparable in both conditions. During exercise, the Pi/PCr ratio was higher (0.36 vs. 0.14) and the pHi was lower (6.85 vs. 7.07) during ES than during VC. For the same external work production, these results reflect a different metabolic solicitation in the ES quadriceps than in the VC ones. Verf.-Referat