A Study Of Chronic Muscle Injury Due To Changes In Joint Angles In Figure Skaters

PURPOSE: Figure skaters are at greater risk for muscle injury. However, the dynamics behind these injuries and the joint changes in skating and jumping are unclear. The study used a combination of multibody dynamics modeling and simulation to record the joint angles, muscle contraction, and movement intensity of each movement of the athlete in order to identify movement deficiencies for targeted training and protection. METHODS: Select figure skaters of both sexes 5 (age: 15-19, participate in the national youth competition of the top 10) for single jump and clockwise/counterclockwise rotation and other actions. Using high-speed camera 3D equipment to dynamically simulate human movement, complete the basic technical movements of figure skaters, including posture, stomping, skating and arm swing capture. RESULTS: 1) Fatigue injury of the knee joint is mainly caused by repeated flexion and extension of the knee joint within 120°-170°.2)The hip joint moves between 20° and 60° during the rotational technical maneuver. When the hip flexion angle was 50° and the angular velocity reached 20 rad/s (maximal muscle activity of hip flexors 0.977, other maximal muscle activity 1.328, and left psoas major 0.893), the muscles were in an overloaded state. 3) The change of body posture affects the rotational speed, the maximum angular velocity is 2.24 rad/s, the minimum is 1.16 rad/s, and the ratio of the two is 1.9. CONCLUSION: 26% of skaters will be injured during competition, with the chance of a sports injury to the lumbar spine being about 15%. Chronic injuries may occur in muscles that have been active for a long period of time such as the psoas major, transversus abdominis, rectus abdominis, internal obliques, external obliques, and erector spinae. Muscle fatigue injury and acute non-contact muscle rupture caused by the combination of large-angle flexion and extension of the joints represented by the hip joint and rapid body rotation.