Sarcolemmal Excitability, M-Wave Changes, and Conduction Velocity During a Sustained Low-Force Contraction
| Autor: | Nicolas Place, Javier Rodriguez-Falces |
|---|---|
| Přispěvatelé: | Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica, Electrónica y de Comunicación, Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektriko, Elektroniko eta Telekomunikazio Saila |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Sustained contraction
membrane excitability medicine.medical_specialty Contraction (grammar) conduction velocity low-level contraction neuromuscular propagation peripheral fatigue submaximal contraction sustained contraction Physiology Conduction velocity Submaximal contraction Membrane excitability Isometric exercise Neuromuscular propagation Nerve conduction velocity Low-level contraction Femoral nerve Physiology (medical) Internal medicine medicine QP1-981 Original Research Chemistry Peripheral fatigue Compound muscle action potential Amplitude Cardiology |
| Zdroj: | Frontiers in Physiology, Vol 12 (2021) Academica-e. Repositorio Institucional de la Universidad Pública de Navarra instname Frontiers in physiology, vol. 12, pp. 732624 Frontiers in Physiology |
| Popis: | This study was undertaken to investigate whether sarcolemmal excitability is impaired during a sustained low-force contraction [10% maximal voluntary contraction (MVC)] by assessing muscle conduction velocity and also by analyzing separately the first and second phases of the muscle compound action potential (M wave). Twenty-one participants sustained an isometric knee extension of 10% MVC for 3min. M waves were evoked by supramaximal single shocks to the femoral nerve given at 10-s intervals. The amplitude, duration, and area of the first and second M-wave phases were computed. Muscle fiber conduction velocity, voluntary surface electromyographic (EMG), perceived effort, MVC force, peak twitch force, and temperature were also recorded. The main findings were: (1) During the sustained contraction, conduction velocity remained unchanged. (2) The amplitude of the M-wave first phase decreased for the first ~30s (−7%, ppp |
| Databáze: | OpenAIRE |
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