Gailey R S, Wenger M A, Raya M, Kirk N, Erbs K, Spyropoulos P, Nash M S
Division of Physiotherapy, University of Miami, Florida 33146.
Prosthet Orthot Int. 1994 Aug;18(2):84-91. doi: 10.3109/03093649409164389.
The purpose of this investigation was two-fold: 1) to compare the metabolic cost (VO2), heart rate (HR), and self-selected speed of ambulation of trans-tibial amputees (TTAs) with those of non-amputee subjects; and 2) to determine whether a correlation exists between either stump length or prosthesis mass and the energy cost of ambulation at the self-selected ambulation pace of TTAs. Subjects were thirty-nine healthy male non-vascular TTAs between the ages of 22 and 75 years (mean +/- sd = 47 +/- 16). All had regularly used their prosthesis for longer than six months and were independent of assistive ambulation devices. Twenty-one healthy non-amputee males aged 27-47 years (31 +/- 6) served as controls. Subjects ambulated at a self-selected pace over an indoor course, with steady-state VO2, HR, and ambulation speed averaged across minutes seven, eight and nine of walking. Results showed that HR and VO2 for TTAs were 16% greater, and the ambulation pace 11% slower than the non-amputee controls. Significant correlations were not observed between stump length or prosthesis mass, and the energy cost of ambulation. However, when the TTA subject pool was stratified on the basis of long and short stump length, the former sustained significantly lower steady-state VO2 and HR than the latter while walking at comparable pace. These data indicate that stump length may influence the metabolic cost of ambulation in TTAs.
1）比较经胫截肢者（TTA）与非截肢者的代谢成本（VO2）、心率（HR）和自行选择的步行速度；2）确定在TTA自行选择的步行速度下，残肢长度或假肢质量与步行能量成本之间是否存在相关性。研究对象为39名年龄在22至75岁之间的健康男性非血管性TTA（平均±标准差 = 47±16）。所有人定期使用假肢超过六个月，且不依赖辅助步行设备。21名年龄在27 - 47岁之间（31±6）的健康非截肢男性作为对照组。研究对象在室内路线上以自行选择的速度行走，在步行的第七、八和九分钟期间对稳态VO2、HR和步行速度进行平均。结果显示，TTA的HR和VO2比非截肢对照组高16%，步行速度慢11%。未观察到残肢长度或假肢质量与步行能量成本之间存在显著相关性。然而，当根据残肢长度的长短对TTA受试者群体进行分层时，在以相当的速度行走时，前者的稳态VO2和HR明显低于后者。这些数据表明，残肢长度可能会影响TTA步行的代谢成本。
