Effects of turn angle and pivot foot on lower extremity kinetics during walk and turn actions.
Effects of turn angle and pivot foot on lower extremity kinetics during walk and turn actions.
复制标题
行走和转身动作时转弯角度和枢轴脚对下肢动力学的影响。
DOI：
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发表时间：
2006
影响因子：
1.4
通讯作者：
Y. Wang
中科院分区：
文献类型：
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作者：
Dali Xu;J. Chow;Y. Wang
这项研究检查了行走和转弯时不同转弯角度和枢轴脚的下肢关节力矩。七名年轻人（年龄 21+/-1.3 岁）被要求以自行选择的速度（1.35+/-0.15 m/s）行走，并使用右（旋转）和左（步进）枢轴脚以 0 度（直走）、45 度和 90 度的转弯角度向右转弯。采用视频和测力台系统来收集运动学和动力学数据。逆动力学方法用于使用分段运动学、地面反作用力和力矩来计算关节力矩。随着转弯角度的增加，参与者通过增加踝关节跖屈力矩来降低前进速度。对于旋转和跨步转弯，制动阶段的峰值踝关节跖屈力矩随着转弯角度的增加而增加。仅在旋转转身中观察到踝关节翻转力矩，这表明旋转转弯中涉及的踝部肌肉比步进转弯中涉及的踝关节肌肉更多。转角对不同下肢关节的横向平面力矩分布有显着影响。结果表明，下肢不同解剖结构的负载模式在行走和转身动作中同时受到转弯角度和枢轴脚的影响。
This study examined lower extremity joint moments during walk and turn with different turn angles and pivot feet. Seven young adults (age 21+/-1.3 yrs) were asked to walk at a self-selected speed (1.35+/-0.15 m/s) and to turn to the right using right (spin turn) and left (step turn) pivot feet at turn angles of 0 degrees (walking straight), 45 degrees, and 90 degrees. Video and forceplate systems were employed for kinematic and kinetic data collection. Inverse dynamics approach was used to compute joint moments using segmental kinematics, ground reaction forces, and moments. The participants decreased their forward speed by increasing the ankle plantar flexion moment as the turn angle increased. The peak ankle plantar flexion moment during the braking phase increased with increasing turn angle for both spin and step turns. Ankle invertor moments were observed only in spin turns, suggesting that more ankle muscles are involved in spin turns than in step turns. The turn angle had a significant effect on the transverse plane moment profiles at the different lower extremity joints. The results suggest that the loading patterns of different anatomical structures in the lower extremity are affected by both turn angle and pivot foot during walk and turn actions.