関節トルクからみたヒトの跳躍方向の調節(3部モデル解析)

概要

論文の詳細を見る
The purpose of this study was to clarify the relationship between jumping direction and torque of the hip, knee, and ankle joints. Two methods were employed: an inverse dynamic approach, and a direct dynamic approach. The small degree of knee joint torque in the horizontal movement coincided with the report of Oshima et al. on output force distribution of the functional effective muscle system. Using the inverse dynamic approach, joint torque and work were compared between a standing broad jump and a vertical jump. The standing broad jump is a horizontal movement task, whereas the vertical jump is a vertical movement task. The ratios of work at the hip, knee, and ankle joints to total work were compared between the standing broad jump and vertical jump. Less work was done at the knee joint for the standing broad jump than for the vertical jump. The work was calculated as the product of joint angular velocity and joint torque. The time curve of joint angular velocity was similar for the standing broad jump and vertical jump. Knee joint torque for the standing broad jump was less than that for the vertical jump and was also less than were hip and ankle joint torques. For the vertical jump, the amplitude of knee joint torque was the same as that for the hip and ankle joints. Using the direct dynamic approach, a computer simulation was run in which the hip, knee, and ankle joint torque amplitudes for the vertical jump were modified by predecided magnifications. The relationship between magnification of the modified joint torque and the body's center of gravity was examined. The predecided magnifications for each joint torque were from 0.0 to 1.9, at intervals of 0.1. There were thus 8000 patterns of magnification sets. The smaller the magnification of the modified torque of the knee joint in comparison with that of the hip and ankle joints, the greater was the forward velocity of the body's center of gravity. It became clear that a small degree of knee joint torque is necessary and sufficient for generating horizontal movement. It was predicted that such a small degree of knee joint torque was caused by co-contraction between the knee joint extensor muscle and the bi-articular muscles. Oshima et al., in reporting on output force distribution of the functional effective muscle system, stated that the mono-articular hip extensor, mono-articular knee extensor, and bi-articular knee flexor must be activated in order to push the foot against the ground both backward and downward. If these muscles are activated, knee joint extension torque will be small.
バイオメカニズム学会の論文
2002-06-25

関節トルクからみたヒトの跳躍方向の調節(3部モデル解析)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク

関節トルクからみたヒトの跳躍方向の調節(3部 モデル解析)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク

関節トルクからみたヒトの跳躍方向の調節(3部モデル解析)