Intrinsic motor neuron excitability is increased after resistance training in older adults
Lucas B. R. Orssatto, Patrick Rodrigues, Karen Mackay, Anthony J. Blazevich, David N. Borg, Tiago Rosa de Souza, Raphael Luiz Sakugawa, Anthony Shield, Gabriel S. Trajano
Abstract
Resistance training elicited important alterations in soleus intrinsic motor neuronal excitability, likely mediated by enhanced persistent inward current (PIC) amplitude, in older adults. Estimates of PICs increased after the training period, accompanied by an enhanced ability to increase PIC amplitudes at higher contraction intensities. Our data also suggest that changes in PIC contribution to self-sustained discharging may contribute to increases in motor neuron discharge rates, maximal strength, and functional capacity in older adults after resistance training.
Topics & Concepts
Motor unitMotor neuronPhysical medicine and rehabilitationElectromyographyElectrophysiologyChemistryMedicineCardiologyAnimal scienceAnatomyInternal medicineBiologyDiseaseMuscle activation and electromyography studiesEEG and Brain-Computer InterfacesMotor Control and Adaptation