EFFECT OF ALTERATIONS IN PROSTHETIC SHANK MASS ON THE METABOLIC COSTS OF AMBULATION IN ABOVE-KNEE AMPUTEES
EFFECT OF ALTERATIONS IN PROSTHETIC SHANK MASS ON THE METABOLIC COSTS OF AMBULATION IN ABOVE-KNEE AMPUTEES
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DOI：
10.1097/00002060-199409000-00008
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发表时间：
1994-09-01
影响因子：
3
通讯作者：
WEAVER, K
中科院分区：
文献类型：
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作者：
CZERNIECKI, JM;GITTER, A;WEAVER, K
膝上截肢者的代谢成本明显高于正常人。假肢质量和质量分布对步行代谢成本的作用研究有限。因此，在不同的质量条件下，研究了八个单侧创伤膝上截肢者的代谢成本。所有受试者均为活跃的年轻截肢者，采用常见的假肢处方，包括全接触坐骨包容、带有graphlite膝关节组件和液压装置的吸引悬吊接受腔以及西雅图轻型足（模型和仪器开发，西雅图，WA）。在自行选择的步行速度和三种控制速度（0.6，1.0和1.5 m/s）下，在地面上收集呼出气体。测量呼气量和气体浓度，并计算每个安培速度下的代谢成本（ml/kg/m2）。在1周的适应期后，在另外两个阶段收集数据，在小腿质心处增加0.68和1.34 kg。结果表明，在不负重的条件下，自行选择的步行速度具有最低的代谢能量消耗，并且在所研究的任何速度下，向小腿添加重量并没有显著改变Ambassador的代谢成本。对较轻重量假体的普遍要求似乎并不是基于Ambassador的代谢成本。
The metabolic costs of above-knee amputee ambulation are significantly greater than normal. The role of prosthetic mass and mass distribution on the metabolic costs of walking has received limited study. The metabolic costs of eight unilateral traumatic above-knee amputees were therefore studied under varying mass conditions. All of the subjects were active young amputees with a common prosthetic prescription, which included a total contact ischial containment, suction suspension socket with a graphlite knee assembly and a hydraulic unit, with a Seattle Light Foot (Model and Instrument Development, Seattle, WA). Expired gases were collected during over-ground ambulation at their self-selected walking speed and at three control speeds (.6, 1.0 and 1.5 m/s). The expired volumes and gas concentrations were measured, and the metabolic cost (ml/kg/m) at each ambulation speed was calculated. Data were collected on two further sessions with the addition of 0.68 and 1.34 kg to the center of mass of the shank, after a 1 wk acclimatization period. Results show that in the unweighted condition, the self-selected walking speed had the lowest metabolic energy expenditure and that the addition of weight to the shank did not significantly alter the metabolic costs of ambulation at any of the speeds studied. The common request for lighter weight prostheses does not appear to be based on the metabolic costs of ambulation.