Features of EEG and EMG Signals Before and After Different Forms of Isokinetic Contraction of the Upper Limb Muscle of Male Basketball Players

Abstract

This study explores the differences between peripheral fatigue and central fatigue after eccentric and concentric contraction fatigue. Eight male basketball student-athletes were selected as study subjects, with an age of 20.0±1.2 years, height 190.3±7.6 cm and weight 90.1±5.8 kg. Each subject was required to perform 10 sets of 10 eccentric and concentric contraction fatigue tests at equal speeds. During equal-speed training, EMG signals of the biceps and triceps were recorded simultaneously. Centrifugal contraction was performed one week after centriolar contraction. The EMG signal and EEG signal were processed and analyzed using the MR3 EMG signal analysis software and MATLAB. Paired sample t-test was conducted for peak torque before and after isokinetic contraction, EMG, MF, MPF of EMG signal and power spectrum ratio of EEG signal in each frequency band. One-way ANOVA was conducted for each index after centripetal contraction and eccentric contraction. The inflection point of the peak moment of isokinetic muscle force is basically the same as that of the electromyographic signal. The fatigue time of centripetal contractile muscles is earlier than that of centrifugal contractile muscles, and the degree of peripheral fatigue after centripetal contractile muscles is obviously higher than that of centrifugal contractile muscles. The degree of central fatigue after centrifugal motion is greater than that after centripetal contraction.