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02 - EFEITO DO EXERCÍCIO FÍSICO SOBRE A EXCITABILIDADE MUSCULOESQUELÉTICA DO MÚSCULO VASTO LATERAL

Doi: 10.47094/IIICOLUBRASMU.2026/RE/2

PALAVRAS CHAVE: Eletromiografia. Joelho. Exercício físico.

KEYWORDS: Electromyography. Knee. Physical exercise.

ABSTRACT:
INTRODUCTION
Surface electromyography (sEMG) is an examination aimed at assessing muscle electrical activity during the depolarization and repolarization phases of cell membranes; it captures the spatial and temporal summation of action potentials via an electromyographic signal collected through electrodes placed on the skin (Clancy et al., 2023).
Force production by a healthy muscle depends on the neural control system, which is responsible for the activation and recruitment of motor units during muscle contraction. The responsible motor neuron activates the motor unit's muscle fibers via neuromuscular junctions. Action potentials generated within a muscle fiber during contraction travel at a constant velocity from the innervation zone toward the muscle tendons; generally, the propagation velocity of the potential is similar across all fibers (Maffiuletti et al., 2016; Clancy et al., 2023).
The vastus lateralis is the primary knee extensor muscle and the largest and strongest muscle of the quadriceps; it plays a fundamental role in functions such as walking, sitting and standing, ascending and descending stairs, squatting, running, and jumping. Its anatomy and anatomical position facilitate the collection of electromyographic signals, as it is more superficial compared to the other quadriceps muscles and possesses greater length and width (Murphy et al., 2023; Biondi & Varacallo, 2023).

Autores

  • Amanda Cândido Barsanulfo

  • Anna Clara Miranda Morais

  • Charliane dos Santos Rodrigues

  • Daniela Visentin Conceição

  • Emanuella Caser Ferreira

  • Emilly Munhoz Rezende

  • Flávia Martins Gervásio

  • Vitória Lima da Oliveira

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