Department of Applied Physics, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland.
J Biomech. 2012 Jun 26;45(10):1769-74. doi: 10.1016/j.jbiomech.2012.05.002. Epub 2012 May 26.
This study examines the effects of a radical bariatric surgery-induced weight loss on the gait of obese subjects. We performed a three-dimensional motion analysis of lower limbs, and collected force platform data in the gait laboratory to calculate knee and hip joint moments. Subjects (n=13) performed walking trials in the laboratory before and 8.8 months (SD 4.2) after the surgical procedure at two gait speeds (1.2m/s and 1.5m/s). The average weight loss was 26.7kg (SD 9.2kg), corresponding to 21.5% (SD 6.8%) of the initial weight. We observed a decrease in step width at both gait speeds, but no changes in relative double support or swing time or stride length. A significant decrease was noted in the absolute values of peak knee abductor, peak knee flexor and peak hip extensor moments. However, the moment values normalized by the body weight and height remained unchanged in most cases. Thus, we conclude that weight loss reduces hip and knee joint moments in proportion to the amount of weight lost.
本研究旨在探讨激进减重手术引起的体重减轻对肥胖受试者步态的影响。我们对下肢进行了三维运动分析，并在步态实验室中收集力台数据以计算膝关节和髋关节力矩。受试者（n=13）在手术前和手术后 8.8 个月（SD 4.2）在两个步行速度（1.2m/s 和 1.5m/s）下在实验室中进行了步行试验。平均体重减轻了 26.7kg（SD 9.2kg），相当于初始体重的 21.5%（SD 6.8%）。我们观察到在两种步行速度下步宽均减小，但相对双支撑或摆动时间或步长没有变化。绝对峰值膝外展肌、峰值膝屈肌和峰值髋伸肌力矩显著降低。然而，在大多数情况下，体重和身高归一化后的力矩值保持不变。因此，我们得出结论，体重减轻与减轻的体重成比例地减少髋关节和膝关节力矩。
