Adaptations in antagonist co-activation: Role in the repeated-bout effect.

ABSTRACT: Eccentric exercise results in an adaptation which attenuates muscle damage from subsequent exercise-termed the "repeated-bout effect (RBE)."

Purpose

Study examined antagonist co-activation and motor-unit recruitment strategy, assessed via dEMG, concomitant to the RBE.

Methods

Nine participants performed 5 sub-maximal isometric trapezoid (ramp-up, hold, ramp-down) contractions at force levels corresponding to 50% and 80% of maximal isometric strength (MVC). Surface EMG signals of the biceps brachii were decomposed into individual motor-unit action potential trains. The relationship between mean firing rate (MFR) of each motor-unit and its recruitment threshold (RT) was examined using linear regression. Eccentric exercise was then performed until biceps brachii MVC had decrease

SUBMITTER: Hight RE 

PROVIDER: S-EPMC5720767 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature