Taylor M B, Clark E, Offord E A, Baxter C
Bioengineering Department, Royal Hull Hospitals, UK.
Prosthet Orthot Int. 1996 Aug;20(2):116-21. doi: 10.3109/03093649609164428.
Comparisons were made between the Intelligent Prosthesis (IP), Mauch and pneumatic swing phase control damping systems on the same prosthesis worn by a high level trans-femoral amputee. Speeds self selected by corridor walking (4.4-5.5 kmh-1) proved not to be sustainable for treadmill walking. Comfortable speeds were attained when the subject walked on a treadmill at 2.0, 2.6 and 3.2 kmh-1 in two tests for each prosthesis type. Oxygen uptake (VO2), cadence and heart rate were measured over 5 minute walks interspersed with rest periods. Spearman's correlation was used to test for differences between prosthesis types at each speed. At the two slower speeds no significant difference was found, but at the higher speed of 3.2 kmh-1, the IP was associated with a significantly lower VO2 (p < 0.05). A two way analysis of variance with replication (ANOVA) demonstrated a significant difference between VO2 for different limb types (p = 0.015). A square law function was fitted to the mean VO2 for each prosthesis type by the method of least squares regression. ANOVA demonstrated a significant difference between velocity coefficients for the different prosthesis types (p < 0.05). Cadence was almost constant during the period of each walk, varying by 1 step min-1 at most. However the test-retest differences in cadence were considerable. It is concluded that there was little difference in energy expenditure between prosthesis types at slower speeds, but at higher speeds (==> 3.2km h-1) the IP gave a lower oxygen uptake by about 10%.
对智能假肢（IP）、莫克（Mauch）和气动摆动期控制阻尼系统进行了比较，这些系统安装在一名高水平经股骨截肢者佩戴的同一假肢上。事实证明，走廊行走时自行选择的速度（4.4 - 5.5千米/小时）无法维持在跑步机上行走。在针对每种假肢类型的两项测试中，当受试者以2.0、2.6和3.2千米/小时的速度在跑步机上行走时，达到了舒适的速度。在5分钟的行走过程中，穿插休息时段，测量了摄氧量（VO₂）、步频和心率。使用斯皮尔曼相关性检验每种速度下不同假肢类型之间的差异。在两个较慢的速度下未发现显著差异，但在3.2千米/小时的较高速度下，IP与显著更低的VO₂相关（p < 0.05）。重复测量的双向方差分析（ANOVA）表明，不同肢体类型的VO₂之间存在显著差异（p = 0.015）。通过最小二乘法回归，为每种假肢类型的平均VO₂拟合了一个平方律函数。ANOVA表明，不同假肢类型的速度系数之间存在显著差异（p < 0.05）。在每次行走期间，步频几乎保持恒定，最多变化1步/分钟。然而，步频的重测差异相当大。得出的结论是，在较慢速度下，不同假肢类型之间的能量消耗差异不大，但在较高速度（> 3.2千米/小时）下，IP的摄氧量降低了约10%。
