The energy cost for the step-to-step transition in amputee walking
The energy cost for the step-to-step transition in amputee walking
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DOI：
10.1016/j.gaitpost.2009.02.009
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发表时间：
2009-07-01
期刊：
影响因子：
2.4
通讯作者：
Polomski, Wojtek
中科院分区：
文献类型：
--
作者：
Houdijk, Han;Pollmann, Eveline;Polomski, Wojtek
本研究的目的是调查截肢者步态的能量消耗增加是否可以解释为步行中一步到一步的过渡过程中消耗的机械功增加。11名经胫骨截肢者（AMP）和11名年龄匹配的对照组（CO）以舒适（CWS）和固定（FWS，1.3 m/s）步行速度行走，同时测量每条腿的外部机械功和代谢能量消耗。在FWS时，AMP的代谢能消耗（（E）/dot（met））显著高于CO（3.34 J kg（-1）s（-1）vs. 2.73 J kg（-1）s（-1））。在CWS中，没有发现能量消耗的差异（3.56 J kg（-1）s（-1）vs. 3.58 kg（-1）s（-1）），但与CO相比，AMP中的CWS显著较低（1.35 m s（-1）vs. 1.52 no s（-1））。在与hi的连接中。在FWS时，由完整的前腿产生的用于双支撑中的步到步过渡的负功对于AMP显著高于CO。在步进到停止过渡期间产生的负机械功率与代谢功率之间存在中度但显著的相关性（CWS：r =-0.56，p = 0.007; FWS：r =-0.50，p = 0.019）。尽管在一步到一步的过渡期间负功存在差异，但在一步中的总绝对机械功在两组之间没有差异。这可能是由于在单一支撑期间内部正功和负功的交换，这在外部功计算中仍然没有注意到。结论是，从假肢到完整肢体的一步一步过渡所增加的机械功导致截肢者行走的代谢能量消耗增加。(C)2009 Elsevier B. V.保留所有权利。
The purpose of this study was to investigate whether the increased energy cost of amputee gait could be accounted for by an increase in the mechanical work dissipated during the step-to-step transition in walking. Eleven transtibial amputees (AMP) and 11 age-matched controls (CO) walked at both comfortable (CWS) and fixed (FWS, 1.3 m/s) walking speed, while external mechanical work of each separate leg and metabolic energy consumption were measured. At FWS the metabolic energy consumption ((E) over dot(met)) was significantly higher in AMP compared to CO (3.34 J kg(-1) s(-1) vs. 2.73 J kg(-1) s(-1)). At CWS, no difference in energy consumption was found (3.56 J kg(-1) s(-1) vs. 3.58 kg(-1) s(-1)) but CWS was significantly lower in AMP compared to CO (1.35 m s(-1) vs. 1.52 no s(-1)). In Conjunction with the hi.-her (E) over dot(met) at FWS, the negative work generated by the intact leading leg for the step-to-step transition in double support was significantly higher for AMP than CO at FWS. A moderate though significant correlation was found between negative mechanical power generated during the step-to-stop transition and metabolic power (CWS: r = -0.56, p = 0.007; FWS: r = -0.50, p = 0.019). Despite the difference in negative work during the step-to-step transition, the total absolute mechanical work over a Stride did not differ between groups. This could possibly be attributed to exchange of internal positive and negative work during single support, which remains unnoticed in the external work calculations. it was concluded that the increased mechanical work for the step-to-step transition from prosthetic to intact limb contributes to the increased metabolic energy cost of amputee walking. (C) 2009 Elsevier B.V. All rights reserved.