Crouse S F, Lessard C S, Rhodes J, Lowe R C
Department of Health and Physical Education, Texas A & M University, College Station 77843.
Arch Phys Med Rehabil. 1990 Apr;71(5):313-7.
This study measured oxygen uptake (VO2), minute ventilation (VE), and heart rate (HR) in a bilateral above-knee (AK) amputee and in three able-bodied controls during progressive treadmill exercise. Walking conditions for the amputee included using bilateral short-leg (SL) and long-leg (LL) prostheses. A progressive treadmill protocol to maximal capacity was used for the amputee and duplicated by the control subjects. An automated system was used to measure VO2, VE, and HR throughout exercise. Data analysis was restricted to the use of parameter averages and percentages to describe differences between experimental conditions. Maximal VO2 for the amputee averaged 23.3mL/kg-1/min-1 with the LL and 22.8mL/kg-1/min-1 with the SL prostheses, a negligible difference between conditions; however, exercise duration was 27% longer when using the SL prostheses. In addition, when averaged over the first four stages of exercise, VO2, VE, and HR were 24%, 32%, and 14% higher, respectively, when the LL prostheses were used. Treadmill walking by unimpaired controls averaged 47% and 79% more economical than walking with the SL or LL prostheses, respectively. These results demonstrate that the use of currently available AK prostheses requires significant energy expenditure, which limits their use to only the most physically fit individuals.
本研究在一名双侧膝上截肢者和三名健全对照者进行递增式跑步机运动期间，测量了摄氧量（VO₂）、每分通气量（VE）和心率（HR）。截肢者的行走条件包括使用双侧短腿（SL）和长腿（LL）假肢。截肢者采用递增式跑步机方案至最大能力，对照受试者重复该方案。整个运动过程中使用自动化系统测量VO₂、VE和HR。数据分析仅限于使用参数平均值和百分比来描述实验条件之间的差异。截肢者使用LL假肢时的最大VO₂平均为23.3mL/kg⁻¹/min⁻¹，使用SL假肢时为22.8mL/kg⁻¹/min⁻¹，不同条件之间差异可忽略不计；然而，使用SL假肢时运动持续时间长27%。此外，在前四个运动阶段平均计算时，使用LL假肢时VO₂、VE和HR分别高出24%、32%和14%。健全对照者在跑步机上行走分别比使用SL或LL假肢行走节省47%和79%的能量。这些结果表明，使用目前可用的膝上假肢需要大量能量消耗，这限制了它们仅适用于身体状况最佳的个体。
