| Motion monitoring has been used in medical fields such as physiological monitoring and gait(video)analysis.Nowadays,it is increasingly used in sports competition and training to monitor and analyze athletes’ sports level and state,and sports monitoring system has become a new favorite in the field of sports competition.Wearable exercise monitoring devices come in a variety of forms.They can monitor simple physiological indicators,including body temperature,heart rate,electromyography,pulse,blood pressure,etc.They can also perform simple exercise process analysis,including step count,exercise time,exercise rate,etc.But for professional athletes or sports fans with higher requirements,simple physiological indicators monitoring and movement analysis is far from enough.They need more biochemical monitoring and more accurate technical movement monitoring to analyze the physiological and movement changes during their movement,among which lactate concentration monitoring and joint Angle monitoring are essential.In this paper,the demand analysis of the self-supply energy movement monitoring system is carried out,and it is concluded that the current monitoring indicators of the system should pay more attention to the physiological and biochemical indicators of athletes,especially the concentration of lactic acid and joint Angle.For the functionality of the system,it is necessary to achieve real-time non-invasive,and to achieve the device size should be small,lightweight and flexible.Therefore,according to these requirements,a self-powered motion monitoring system was prepared in this paper.The system can be conveniently installed on the athletes’joints,and through active output of piezoelectric signals(driven by the movement itself),the running speed,stride frequency and joint Angle changes of athletes during the movement can be monitored in real time.The piezoelectric output voltage can be used both as a power source for the system and as a sensor signal.The device can also monitor lactate concentrations on the skin of athletes.According to the experimental data is discussed,the following conclusions:self-energized movement monitoring system can real-time condition monitoring individual sweat lactic acid concentration in the process of movement and joint Angle changes,the conclusion can for the coaches in the sports training process monitoring athletes physiological indexes change and provides some references for the motion performance,but also for the selection of athletes,performance monitoring,and provides the basis for injury prevention.This interdisciplinary research can point out a new direction for the development of sports science and promote the development of flexible self-powered multi-functional nanometer. |
