Electromyography Mean Power Frequency Alternations during Rapid Transition of Elbow Flexion to Extension

Objective:The purpose of this study was to explore the independent role of central motor control in the alternations of sEMG mean power frequency during elbow flexion to extension transition.Method:10 healthy male subjects took part in the experiment,which consisted of two phase isometric fatigue loading exercise.In the first exercise,the subject performed elbow flexion as soon as possible under the load intensity 60%MVC,then subject performed elbow isometric extension as soon as possible.Both sEMG activities of biceps brachii and triceps brachii were recorded and then mean power frequency and other parameters were calculated.Result:(1)During the rapid transition phase,mean power frequency and other sEMG parameters changed significantly.(2)During two phase elbow isometric contractions,both agonist and antagonist muscle showed similar activity patterns of MPF,C(n)and %DET,but AEMG remained relatively constant.Conclusion:The experimental results suggested brain central motor control system displayed an independent role in the alternations of MPF of biceps brachii during fatigue exercise,the possible mechanisms was that both agonist and antagonist were totally controlled by the central motor control system.