Differences in the recruitment curves obtained with monopolar and bipolar electrode configurations in the quadriceps femoris
Objective: to verify whether the stimulation intensity at which M-wave amplitude reaches the plateau actually corresponds to full motor unit activation in monopolar and bipolar configurations. Methods: M waves and twitches were evoked using femoral nerve stimulation of gradually-increasing intensity...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universidad Pública de Navarra |
| Repositorio: | Academica-e. Repositorio Institucional de la Universidad Pública de Navarra |
| OAI Identifier: | oai:academica-e.unavarra.es:2454/55576 |
| Acceso en línea: | https://hdl.handle.net/2454/55576 |
| Access Level: | acceso abierto |
| Palabra clave: | Femoral nerve stimulation Recruitment curve Motor unit recruitment Monopolar recording Plateau stimulus intensity |
| Sumario: | Objective: to verify whether the stimulation intensity at which M-wave amplitude reaches the plateau actually corresponds to full motor unit activation in monopolar and bipolar configurations. Methods: M waves and twitches were evoked using femoral nerve stimulation of gradually-increasing intensity in 21 subjects. Recruitment curves corresponding to the amplitude of the first phase (AmpliFIRST) and peak-to-peak amplitude (AmpliPP) of the M wave were obtained in the vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) in monopolar and bipolar configurations. Results: in all muscles, bipolar M waves and twitches reached the plateau at a significantly lower stimulus intensity compared to monopolar M waves (P<0.05). The different behaviour of monopolar and bipolar M waves with stimulus intensity was found for both AmpliFIRST and AmpliPP. Conclusions: in bipolar configuration, the stimulus intensity at which M waves plateau should be increased at least by 10-20% to achieve complete motor unit recruitment. |
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