Reference : Human Muscle Energetics During Voluntary and Electrically Induced Isometric Contractions...
Scientific journals : Article
Human health sciences : Orthopedics, rehabilitation & sports medicine
http://hdl.handle.net/2268/24877
Human Muscle Energetics During Voluntary and Electrically Induced Isometric Contractions as Measured by 31p Nmr Spectroscopy
English
Vanderthommen, Marc mailto [Université de Liège - ULg > Département des sciences de la motricité > Kinésithérapie spécifique et réadaptation motrice >]
Gilles, R. [CHU Liège > > RMN > >]
Carlier, Pierre [Institut de Myologie, Paris, France > > > >]
Ciancabilla, F. [CHU de Liège > > RMN > >]
Zahlan, O. [> > > >]
Sluse, Francis mailto [Université de Liège - ULg > Département des sciences de la vie > Bioénergétique et physiologie cellulaire >]
Crielaard, Jean-Michel mailto [Université de Liège - ULg > Département des sciences de la motricité > Evaluation et entraînement des aptitudes physiques >]
Jul-1999
International Journal of Sports Medicine
20
5
279-83
Yes (verified by ORBi)
International
0172-4622
[en] 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.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/24877

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