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Top1. Introduction
With the rapid development of society and the continuous improvement of people's living standards, sport and exercise have become an indispensable part in people's daily living. Exercise can strengthen the body and make people feel happy, but excessive exercise may cause physical damage and injury. There are also some special occupations, such as athlete, soldier, who requires a lot of sports training every day. Excessive training will weaken the training effect, and may lead to more serious consequences such as syncope, muscle damage and even sudden death (da Rocha 2019).
Fatigue is a kind of discomfort felt by humans. It is a feeling that appears after the human body undergoes a lot of physical or mental work. It will reduce people's ability to complete work. Generally speaking, fatigue is divided into mental fatigue, physical fatigue and pathological fatigue. The sport fatigue is defined as that the body cannot maintain the function at a certain level, or cannot maintain a predetermined exercise intensity. When sport fatigue occurs, the athlete's heart load will continue to increase, become more irritable than usual, muscle aches and flexibility decreases, and the necessary thinking ability in competitive sports such as judgment and reaction will also decrease (Thorpe 2017). Therefore, sports fatigue is a comprehensive physical and mental fatigue that combines mental, psychological, and physical strength.
Exercise fatigue is bound to cause changes in the biochemical conditions in the human body. Therefore, it will change the ion current in the human body. The associated bioelectric signals are easy to collect (Durant 2019). This paper adopts bioelectric signals to analyze sport fatigue.
The research about sport fatigue monitoring and recognition can classified as subjective evaluation (GÖKER 2018) and objective evaluation (Kelly 2017). The objective evaluation utilizes objective human biochemical and bioelectrical indicators to analyze sport fatigue, such as electrocardiogram, myoelectricity, blood lactic acid, blood oxygen concentration, body temperature, skin electricity, brain electricity, eye electricity, facial expression recognition, respiration. It is called physiological fatigue assessment (Yu 2019). The subjective evaluation analyzes the degree of fatigue of the human body by combining self-fatigue feeling and fatigue scale. As traditional exercise fatigue assessment, the subjective assessment is quick, direct and effective. However, it lacks objectivity merely adopting subjective evaluation. The sport fatigue analysis is a complicated process. It is difficult to comprehensively and accurately analyze and evaluate sport fatigue merely using subjective assessment. This paper combines objective evaluation and subjective evaluation to analyze sport fatigue to explore the relationship between physical fatigue indicators and mental fatigue during sports and overcome the weakness in subjective evaluation. In objective assessment, we adopt electrocardiograph (ECG) (Bhardwaj 2018) and electromyography (EMG) (Jebelli 2019).