An analysis of motor unit firing pattern during sustained low force contraction in fatigued muscle.

摘要: In the present study motor unit (MU) firing pattern was analysed during long-term static contraction in order to see if fatigue would induce rotation of activity between different MU. Surface as well intramuscular EMG were obtained from ten subjects a sustained hand lift for 5 minutes after performance 30% MVC fatiguing extensor carpi radialis muscle. A newly developed decomposition program constituted powerful tool obtain detailed knowledge long term MU low force contractions. Although muscle highly fatigued majority showed continuous recruitment and no clear incidences found any subjects. Therefore, term, contractions, performed many occupational work tasks, may involve activation threshold this could have mechanical metabolic implications these fibers.