ABSTRACT

　The purpose of this study was to quantitatively evaluate knee impact loads during basketball practice using wearable inertial sensors and to investigate differences between the dominant and non-dominant limbs in high school female basketball players. Eight female players（ 15±0 years） from the same team participated. During 3-on-3 or 4-on-4 practice sessions, inertial sensors（ BlueTrident IMU, VICON） were affixed bilaterally over the tibial tuberosity to record acceleration. Composite acceleration exceeding 20 G was defined as a high-impact movement. The total count and frequency per minute of high impact were calculated for both limbs. Simultaneously, video recordings were used to categorize high-impact events into stops, sprints, decelerations, side-steps, and other movements. Statistical comparisons between dominant and nondominant limbs were performed using the Wilcoxon signed-rank test（ p < 0.05） . The median frequency of high-impact events per minute was 14.0（0.0?41.3） for the dominant limb and 18.2（0.0?40.2） for the non-dominant limb, with no significant differences. Among movement categories, stops, sprints, and decelerations accounted for the highest frequencies of high-impact movements on both limbs. These findings suggest that rapid acceleration and deceleration typical of basketball induce substantial knee impact loads, yet no clear limb dominance was evident in high-impact frequency. Future research should examine the relationship between high-impact thresholds and anterior cruciate ligament injury risk.

DECENTE SPORTS SCIENCE Vol.47/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE