title: Comparison of the pedalling performance induced by magnetic and electrical stimulation cycle ergometry in able-bodied subjects.
abstract: The purpose of the study was to compare the mechanical power and work generated by able-bodied subjects during functional magnetic stimulation (FMS) vs. functional electrical stimulation (FES) induced ergometer training conditions. Both stimulation methods were applied at a 30 Hz frequency to the quadriceps muscles of 22 healthy able-bodied subjects to induce cycling for 4× four minutes or until exhaustion. FMS was performed via large surface, cooled coils, while FES was applied with a typical stimulation setup used for cycling. Significantly more (p<10(-3)) muscular power was generated by FMS (23.8 ± 9.1W [mean ± SD]) than by FES (11.3 ± 11.3 W). Additionally, significantly more (p<10(-6)) work was produced by FMS than by FES (4.413 ± 2.209 kJ vs. 0.974 ± 1.269 kJ). The increase in the work was paralleled by a significant prolongation of time to cycling failure (181.8 ± 33.4s vs. 87.0 ± 54.0 s, respectively, p<10(-5)). Compared to FES, FMS can produce more intense and longer cycling exercise in able-bodied subjects. The differing dynamic behaviour of FMS and FES in the presented measurement setup might be related to stimulation induced pain and fatigue mechanisms of the neuromuscular system.
authors.affiliation: Center for Sensorimotor Research, Department of Neurology, Ludwig-Maximilians University, Munich, Germany. Electronic address: jszecsi@kabelmail.de.
authors.forename: J
authors.initials: J
authors.lastname: Szecsi
authors.affiliation: Center for Sensorimotor Research, Department of Neurology, Ludwig-Maximilians University, Munich, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Straube
authors.affiliation: Discipline of Exercise and Sports Science, Faculty of Health Sciences, University of Sydney, Sydney, Australia.
authors.forename: C
authors.initials: C
authors.lastname: Fornusek
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D004558:Electric Stimulation; D016552:Ergometry / Q000295:instrumentation / Q000379:methods*; D015444:Exercise / Q000502:physiology; D005260:Female; D006801:Humans; D016014:Linear Models; D060526:Magnetic Fields; D008297:Male; D010146:Pain / Q000209:etiology; D005082:Physical Exertion; D052097:Quadriceps Muscle / Q000502:physiology; D013997:Time Factors; D019415:Torque
keywords: Fatigue; Magnetic and electrical stimulation; Pain; Power; Rehabilitation; Torque