INTRODUCTION: The aim of this study was to investigate differences in twitch and M-wave potentiation in the quadriceps femoris when electrical stimulation is applied over the quadriceps muscle belly versus the femoral nerve trunk. METHODS: M-waves and mechanical twitches were evoked using direct quadriceps muscle and femoral nerve stimulation between 48 successive isometric maximal voluntary contractions (MVC) from 10 young, healthy subjects. Potentiation was investigated by analyzing the changes in M-wave amplitude recorded from the vastus medialis (VM) and vastus lateralis (VL) muscles and in quadriceps peak twitch force. RESULTS: Potentiation of twitch, VM M-wave, and VL M-wave were greater for femoral nerve than for direct quadriceps stimulation (P < 0.05). Despite a 50% decrease in MVC force, the amplitude of the M-waves increased significantly during exercise. CONCLUSIONS: In addition to enhanced electrogenic Na(+) -K(+) pumping, other factors (such as synchronization in activation of muscle fibers and muscle architectural properties) may significantly influence the magnitude of M-wave enlargement.
INTRODUCTION: The aim of this study was to investigate differences in twitch and M-wave potentiation in the quadriceps femoris when electrical stimulation is applied over the quadriceps muscle belly versus the femoral nerve trunk. METHODS: M-waves and mechanical twitches were evoked using direct quadriceps muscle and femoral nerve stimulation between 48 successive isometric maximal voluntary contractions (MVC) from 10 young, healthy subjects. Potentiation was investigated by analyzing the changes in M-wave amplitude recorded from the vastus medialis (VM) and vastus lateralis (VL) muscles and in quadriceps peak twitch force. RESULTS: Potentiation of twitch, VM M-wave, and VL M-wave were greater for femoral nerve than for direct quadriceps stimulation (P < 0.05). Despite a 50% decrease in MVC force, the amplitude of the M-waves increased significantly during exercise. CONCLUSIONS: In addition to enhanced electrogenic Na(+) -K(+) pumping, other factors (such as synchronization in activation of muscle fibers and muscle architectural properties) may significantly influence the magnitude of M-wave enlargement.
Authors: Daria Neyroud; John Temesi; Guillaume Y Millet; Samuel Verges; Nicola A Maffiuletti; Bengt Kayser; Nicolas Place Journal: Eur J Appl Physiol Date: 2015-02-15 Impact factor: 3.078
Authors: Javier Rodriguez-Falces; Mikel Izquierdo; Miriam González-Izal; Nicolas Place Journal: Eur J Appl Physiol Date: 2014-06-11 Impact factor: 3.078
Authors: Nicola C Casartelli; Julia F Item-Glatthorn; Bernd Friesenbichler; Mario Bizzini; Gian M Salzmann; Nicola A Maffiuletti Journal: J Clin Med Date: 2019-11-05 Impact factor: 4.241
Authors: Rafael Torres-Peralta; David Morales-Alamo; Miriam González-Izal; José Losa-Reyna; Ismael Pérez-Suárez; Mikel Izquierdo; José A L Calbet Journal: Front Physiol Date: 2016-01-11 Impact factor: 4.566