Lin-Chan Suh-Jen, Nielsen David H, Yack H John, Hsu Miao-Ju, Shurr Donald G
School of Physical Therapy, Texas Woman's University, 8194 Walnut Hill Lane, Dallas, TX 75231-4365, USA.
Arch Phys Med Rehabil. 2003 Dec;84(12):1865-71. doi: 10.1016/j.apmr.2003.03.006.
To determine the effect of 3 prosthetic mass conditions on selected physiologic responses during multiple speed treadmill walking in persons with transtibial amputation.
A repeated-measures design for 3 prosthetic mass conditions and 5 walking speeds.
University research laboratory.
Eight ambulatory men with unilateral traumatic transtibial amputation.
The 3 prosthetic mass conditions were 60%, 80%, and 100% of the estimated intact limb below-knee mass. The multiple-speed treadmill walking test (4min at each speed: 54, 67, 80, 94, 107m/min) was performed on an instrumented treadmill according to randomly assigned mass conditions.
Oxygen consumption, gait efficiency, relative exercise intensity (percentage of age-predicted maximal heart rate), and stride frequency.
Prosthetic mass did not significantly alter oxygen consumption or gait efficiency (P>.05). From the 60% to the 100% prosthetic mass conditions, relative exercise intensity significantly increased and stride frequency significantly decreased (P<.05).
A heavier prosthesis (up to 100% of estimated intact limb below-knee mass) did not significantly increase the energy costs of walking for the 5 speeds examined. Further study of gait symmetry with the use of a heavier prosthesis is warranted.
确定三种假肢质量条件对经胫截肢者在多速度跑步机行走过程中选定生理反应的影响。
针对三种假肢质量条件和五种行走速度的重复测量设计。
大学研究实验室。
八名单侧创伤性经胫截肢的可行走男性。
三种假肢质量条件分别为估计完整肢体膝下质量的60%、80%和100%。根据随机分配的质量条件，在装有仪器的跑步机上进行多速度跑步机行走测试（每种速度下行走4分钟：54、67、80、94、107米/分钟）。
耗氧量、步态效率、相对运动强度（年龄预测最大心率的百分比）和步频。
假肢质量未显著改变耗氧量或步态效率（P>0.05）。从60%假肢质量条件到100%假肢质量条件，相对运动强度显著增加，步频显著降低（P<0.05）。
对于所研究的五种速度，较重的假肢（高达估计完整肢体膝下质量的100%）并未显著增加行走的能量消耗。有必要进一步研究使用较重假肢时的步态对称性。
