2021 TSMA

62 2021 Taiwan Sporting Goods Manufacturers Association especially when muscles or bones get injured, the strength of external tolerance appears more important. Because the tolerance is overloaded, it would cause damages again to bones or muscles. Fortunately, applying Newton’s 2 nd Laws of Motion, F = ma, there is a positive correlation between force acting upon an object and the acceleration of the object. It makes tri-axial accelerometer measures the acceleration with algorithm and indirectly estimates the strength and efficiency of physical activities and further evaluates the activity levels. At present there are great number of literature and documents to discuss the credibility and efficiency of accelerometer applications on physical activity levels from daily life, walking and running, different types of sports. Also in discussions of different ages, sex, placement positions, the collected data are compared with kinetics indicators of all sports, it is found that accelerometer is a sound monitoring tool of physical activity levels. Focus on tri-axial accelerometer upon the calculation of sports intensity, NTNU’s research team on Innovative Sports Technology used to collect the acceleration figures and moving speeds on the treadmill as well as walking and running on the road and make relevant comparisons. It is proven that certain algorithm could accurately estimate the sports intensity. Therefore, it is trusted that tri-axial accelerometer can detect the sports tolerance levels and make all sports training more scientific and further increase the training quality. Meanwhile, effective monitoring can avoid overloaded training and decrease the risk of injuries and also increase the benefits of medical treatments. Keep on long time exercise will create fatigue phenomenon. How to use wearable devices to monitor those movement changes is a significant technology to prevent from sports injuries. In the past, NTNU’s research team on Innovative Sports Technology was assigned by Nike to develop smart shoes to remind runners before sports injures. The team published a research paper in Journal of Sports Sciences (2014). It states a gyroscope is able to measure the changing speeds of pronation on foot angles. When the fatigue happens, the pronation of foot angles will increase. When the feet land on the ground, the foot arches will slightly go downward because of the weight. No matter it is walking or running, fatigues happens, the foot arches will be down to the grounds. Then the extents of foot eversion will also increase; that is, overloaded pronation. And it will make impacts upon foot angles, knees to hip joints and up to the movement and gestures. Next, it will cause sports injuries. Such research results indicate that place sensor upon the surface of the shoes in correspondence with Bluetooth tech, we can see the curve changes of foot angles. It does good to monitor the gait features of the user. And through