Quantitative Evaluation of Muscle Based on EMG Analysis and its Application for Rehabilitation

Abstract

In the rehabilitation, experts assesses the recovery reaction while feeling the reaction force from the patient directly. This is due to important to grasp recovery state of muscle of the patient during the rehabilitation. This paper proposes the evaluation methodology of recovery state of muscle, by performing quantitative evaluation of muscular power from relationship between EMG and muscle load, and quantitative evaluation of muscle fatigue from use ratio of muscular fiber type. In addition, the decision method of appropriate muscle load and number of times in rehabilitation is proposed based on the evaluation of recovery state of muscle. Verification and effectiveness of the proposed method are assumed based on a constructed rehabilitation system by simulation work.

Estimation model of muscle fatigue based on muscle fiber type using electromyography

“…As regards muscle fatigue, we focused on that EMG frequency band depends on the muscle fiber type – slow muscle fiber (Type I), medium muscle fiber (Type IIa), and fast muscle fiber (Type IIb); thus, we calculated use ratio of Type I and Type IIb, and defined “muscle fatigue time” as the time point where the use ratios of two fiber types intersect. In addition, we modeled muscle fatigue time in every load band with an exponential function to estimate muscle fatigue time, and verified accuracy of such estimation 5 …”

“…The relationship in Figure 7 is indicative of exponential decay; thus in a previous study, an exponential model was used 5 . In so doing, 1 RM is an important limit to be satisfied, and exponential approximation was designed so as to necessarily pass the point ( t f min , 1 RM ).…”