ABSTRACT

　This study aimed to measure and analyze ground reaction force（GRF） using MEMS 6-axis force sensors mounted in the insoles. The force sensors were placed on the thenar, hypothenar, and heel and measured vertical（Fz），anterior-posterior（Fy），and mediolateral（Fx）forces with a sampling frequency of 50 Hz. Measurements were taken in four events: walking, jogging, wind sprint, and sprint, and a 60 m run from a crouching start. The subject had 8 years of track and field experience. Running speed was maximal at sprint, and the stride was maximal at wind sprint. The time between the peak heel reaction force and the peak thenar reaction force confirmed that the center of gravity movement speed during ground contact was maximum at the sprint. During the wind sprint and sprint, the vertical reaction force and forward shear force at the thenar increased, while the outward and propulsive forces at the hypothenar increased. The vertical force at the heel was smaller than that of the other sensors due to the forefoot strike form. During the 60 m run, strong propulsive forces were measured from the On the other hand, the sensor on the thenar outputs a braking force, which gradually increases with acceleration. These research results suggest that the measurement of GRF using MEMS sensors is easier and more location-independent than force plates? measurement. In this method, the trajectory of the leg can be inferred from the difference in sensor output between the thenar and the hypothenar, suggesting that the data can be used to improve the sprinter? s running form. hypothenar during the acceleration phase, and the values gradually decreased with time.

DECENTE SPORTS SCIENCE Vol.45/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE