Bruijn Sjoerd M, Meijer Onno G, van Dieën Jaap H, Kingma Idsart, Lamoth Claudine J C
Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands.
Gait Posture. 2008 Apr;27(3):455-62. doi: 10.1016/j.gaitpost.2007.05.017. Epub 2007 Jul 31.
In walking faster than 3 km/h, transverse pelvic rotation lengthens the step ("pelvic step"). It is often assumed that the thorax then starts to counter rotate to limit total body angular momentum around the vertical. But the relative timing of pelvis and thorax rotation during gait is insufficiently understood. The present study aimed at analysing how transverse pelvis and thorax rotations relate to the movements of the upper leg, and how these patterns contribute to total body angular momentum. Nine healthy male volunteers walked on a treadmill at nine different velocities, ranging from 2.0 km/h to 5.2 km/h. Full body kinematics were recorded. Femur-pelvis, pelvis-thorax, and femur-thorax relative phase were calculated, as well as transverse plane angular momentum of all body segments. The shift in pelvis-thorax coordination from in-phase to out of phase with increasing velocity was found to depend on the pelvis beginning to move in-phase with the femur, while the thorax continued to counter rotate with respect to the femur. Moreover, pelvic and thoracic contributions to total body angular momentum were low (less than 10%), while contributions of the legs and arms were much larger (approximately 90%), suggesting that pelvis-thorax coordination is relatively unimportant to the organisation of total body angular momentum. Taken together, these results may imply that our understanding of the pelvic step need to be changed. Moreover, the alterations in pelvis-thorax relative phase that were reported for different locomotor pathologies may depend on different mechanisms.
当步行速度超过3公里/小时时，骨盆横向旋转会延长步幅（“骨盆步幅”）。人们通常认为，此时胸部会开始反向旋转，以限制身体围绕垂直轴的总角动量。但人们对步态中骨盆和胸部旋转的相对时间了解不足。本研究旨在分析骨盆和胸部的横向旋转如何与大腿运动相关，以及这些模式如何对身体总角动量产生影响。九名健康男性志愿者在跑步机上以2.0公里/小时至5.2公里/小时的九种不同速度行走。记录全身运动学数据。计算股骨与骨盆、骨盆与胸部以及股骨与胸部的相对相位，以及所有身体节段在横向平面的角动量。研究发现，随着速度增加，骨盆与胸部的协调性从同相转变为异相，这取决于骨盆开始与股骨同相运动，而胸部继续相对于股骨反向旋转。此外，骨盆和胸部对身体总角动量的贡献较低（小于10%），而腿部和手臂的贡献则大得多（约90%），这表明骨盆与胸部的协调性对身体总角动量的组织相对不重要。综上所述，这些结果可能意味着我们对骨盆步幅的理解需要改变。此外，针对不同运动病理学所报告的骨盆与胸部相对相位的改变可能取决于不同的机制。
