The lower lumbar spine moment and the axial rotational motion of a body during one-handed and double-handed backhand stroke in tennis.

摘要: To analyze the load on lumbar spine and motion pattern of a body during backhand stroke when playing tennis, kinematic kinetic data eleven amateur tennis players were collected. Each subject performed one-handed double-handed strokes at low, medium, high racket speeds. The three-dimensional was optically measured by tracking markers attached to their segments. Floor reaction forces for right left feet separately. Using floor force data, lower moment calculated based segment-link model. Peak plateau values joint before after ball impact analyzed statistically using factorial ANOVA (stroke, speed). Similarly, axial rotation angle pelvis against that shoulder analyzed. In all moments except lateral bending angles, there significant main effects speed. showed significantly smaller extension as well than strokes. also feet. These results indicate elbow joints share rotational necessary consequently reduce maximal imposed spinal joints.