European Journal of Applied Physiology

, Volume 89, Issue 2, pp 202–208

Functional and biochemical properties of chronically stimulated human skeletal muscle

Authors

    • Universitätsklinik für Physikalische Medizin und RehabilitationAKH Wien
    • Department of Physical Medicine and RehabilitationGeneral Hospital of Vienna
  • Richard Crevenna
    • Department of Physical Medicine and RehabilitationGeneral Hospital of Vienna
  • Bärbel Gohlsch
    • Department of BiologyUniversity of Konstanz
  • Christian Bittner
    • Department of Physical Medicine and RehabilitationGeneral Hospital of Vienna
  • Johannes Pleiner
    • Department of Physical Medicine and RehabilitationGeneral Hospital of Vienna
  • Günther Wiesinger
    • Department of Physical Medicine and RehabilitationGeneral Hospital of Vienna
  • Veronika Fialka-Moser
    • Department of Physical Medicine and RehabilitationGeneral Hospital of Vienna
  • Michael Quittan
    • Department of Physical Medicine and RehabilitationGeneral Hospital of Vienna
  • Dirk Pette
    • Department of BiologyUniversity of Konstanz
Original Article

DOI: 10.1007/s00421-003-0792-8

Cite this article as:
Nuhr, M., Crevenna, R., Gohlsch, B. et al. Eur J Appl Physiol (2003) 89: 202. doi:10.1007/s00421-003-0792-8

Abstract

The present study was undertaken to investigate in a randomized controlled trial the effects of chronic (10 weeks, 4 h per day, 7 days per week) low-frequency (15 Hz) stimulation (CLFS) of the knee extensor and hamstring muscles of both legs in healthy volunteers via surface electrodes. A control group (n=10) underwent the same treatment (sham stimulation) as the CLFS-treated group (n=10), except that stimulation intensity was kept at a level which did not evoke contractions. Biopsy samples were taken before the onset and after cessation of stimulation from the right vastus lateralis muscle of all subjects. The biopsy samples were analyzed for changes in myosin heavy chain (MHC) isoforms and activities of citrate synthase (CS) and glyceraldehyde phosphate dehydrogenase (GAPDH) as markers of aerobic-oxidative and anaerobic pathways of energy metabolism, respectively. In addition, functional properties, i.e., oxygen consumption (V̇O2) and work capacity, were assessed. Sham stimulation did not affect the functional properties and had no detectable effect on MHC isoform and enzyme activity patterns. Conversely, CLFS induced changes in the MHC isoform pattern in the fast-to-slow direction with a ~20% decrease in the relative concentration of MHCIId/x (from 28% to 22%) and a ~10% increase in the relative concentration of MHCI (from 30% to 34%). In addition, CLFS led to a ~9% increase in the activity of CS concomitant with a ~7% decrease in the activity of GAPDH. This increase in aerobic-oxidative capacity was accompanied by improved work capacity and V̇O2 at the anaerobic threshold by 26% and 20%, respectively.

Keywords

Anaerobic thresholdChronic low-frequency stimulationCitrate synthaseFast-to-slow transitionGlyceraldehyde phosphate dehydrogenaseMyosin heavy chain isoforms

Copyright information

© Springer-Verlag 2003