Herndon Stephanie K, Bennett Bradford C, Wolovick Adam, Filachek Andrew, Gaesser Glenn A, Weltman Arthur, Abel Mark F
Exercise Physiology Program, Department of Human Services, University of Virginia, Charlottesville, and Motion Analysis & Motor Performance Laboratory, Kluge Children's Rehabilitation Hospital, Virginia 22903, USA.
J Orthop Res. 2006 Dec;24(12):2170-5. doi: 10.1002/jor.20292.
The goal of this research was to examine the relationship between center of mass (CoM) motion and metabolic cost and to assess secondarily the effects of equinus gait on metabolic cost during walking trials at various velocities. Twelve (n=12) healthy male adults walked in four brace conditions, including fixed equinus, at three different walking speeds. Metabolic measures and 3D kinematic data were collected during each trial. Significant main effects for velocity were observed on both dependent measures, net O2 cost (p<0.001), and CoM vertical excursion (CoMz) (p<0.01). Correlation analysis showed significant positive correlations between net O2 cost and CoMz that were strongest at fast velocities. Further, analysis revealed the cost of walking at a comfortable speed in the equine position was 28% greater than walking in braces without springs or springs in neutral position and 64% greater than walking in shoes alone. CoMz does correlate with metabolic cost as measured by net O2 cost. Also, normal subjects walking in equinus have an increased net O2 cost and increased CoMz when compared to walking with shoes alone or the other brace conditions at all velocities.
本研究的目的是检验重心（CoM）运动与代谢成本之间的关系，并其次评估马蹄内翻足步态在不同速度步行试验期间对代谢成本的影响。十二名（n = 12）健康成年男性在包括固定马蹄内翻足在内的四种支具条件下，以三种不同的步行速度行走。在每次试验期间收集代谢指标和三维运动学数据。在两个因变量测量指标上均观察到速度的显著主效应，即净耗氧量（p < 0.001）和重心垂直偏移（CoMz）（p < 0.01）。相关性分析表明，净耗氧量与CoMz之间存在显著正相关，且在快速步行时相关性最强。此外，分析显示，以舒适速度在马蹄内翻足姿势下行走的成本比在没有弹簧或弹簧处于中立位置的支具中行走高28%，比仅穿鞋子行走高64%。CoMz确实与以净耗氧量衡量的代谢成本相关。而且，与在所有速度下仅穿鞋子行走或其他支具条件相比，马蹄内翻足姿势行走的正常受试者净耗氧量增加，CoMz增加。
