Quadriceps concentric and eccentric exercise 1: changes in contractile and electrical activity following eccentric and concentric exercise

Journal of Science and Medicine in Sport
M J Hamlin, B M Quigley

Abstract

The purpose of this study was to determine whether or not losses of strength or endurance following eccentric and concentric exercise are associated with reduced excitation. The effects of eccentric and concentric work on maximal voluntary isometric contraction (MVC) and surface electromyogram (EMG) of the quadriceps were studied in 10 healthy male subjects following bench-stepping for 20 min with a constant leading leg. Prior to stepping and at 0, 0.25, 0.50, 0.75, 1, 3, 24 and 48 h afterwards the subjects performed a 30 s leg extension MVC with each leg during which the isometric force and the root mean square voltage of the EMG were recorded. In the eccentrically exercised muscles (ECC), MVC0-3 (force during the first 3 s of contraction) fell immediately after the bench-stepping exercise to 88+/-2% (mean+/-SE) of the pre-exercise value and remained significantly lower than the concentrically exercised muscles (p<0.05). The muscle weakness in the ECC could not be attributed to central fatigue as surface EMG amplitude at MVC0-3 increased during the recovery period. Muscle weakness after eccentric exercise appears to be due to contractile failure, which is not associated with a reduction in excitation as assessed by surface EMG...Continue Reading

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Citations

Oct 27, 2005·European Journal of Applied Physiology·Andrew P Lavender, Kazunori Nosaka
Nov 17, 2009·Journal of Strength and Conditioning Research·Akihiro SakamotoPeter James Sinclair
Sep 27, 2005·Sports Medicine·Chris R Abbiss, Paul B Laursen
Oct 22, 2011·Zhong xi yi jie he xue bao = Journal of Chinese integrative medicine·Kun-peng LiuYa-zhong Zuo
Jun 13, 2013·European Journal of Applied Physiology·Helma M de Morree, Samuele M Marcora
Feb 20, 2007·Scandinavian Journal of Medicine & Science in Sports·R G LarsenK Overgaard
May 23, 2007·American Journal of Physical Medicine & Rehabilitation·Anna MikaViswanath B Unnithan
Sep 12, 2018·International Journal of Sports Physiology and Performance·Eduardo Lusa CadoreMikel Izquierdo

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