Time to failure of a sustained contraction is predicted by target torque and initial electromyographic bursts in elbow flexor muscles.

Abstract:

:The purpose of the study was to identify factors that could predict differences among individuals in the time to failure of a submaximal contraction. Twenty subjects (10 men, 25+/-6 years) supported an inertial load equivalent to 20% of the maximal voluntary contraction (MVC) force with the elbow flexor muscles for as long as possible. The time to failure was predicted by the frequency of electromyographic bursts in the long head of biceps brachii during the first 20% of the contraction, the amplitude of bursts in the brachioradialis during the first 20% of the contraction, and the target torque. Subjects who could sustain the task longer exhibited greater initial (first 20% of contraction) electromyographic burst frequency in the long head of biceps brachii, lower initial burst amplitudes in the brachioradialis muscle, and lower target torque. Knowing the main predictors of a submaximal fatiguing contraction with the elbow flexor muscles may assist clinicians in personalizing therapeutic interventions.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Rudroff T,Christou EA,Poston B,Bojsen-Møller J,Enoka RM

doi

10.1002/mus.20752

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

657-66

issue

5

eissn

0148-639X

issn

1097-4598

journal_volume

35

pub_type

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