Engsberg J R, Herbert L M, Grimston S K, Fung T S, Harder J A
Human Performance Laboratory, University of Calgary, Alberta, Canada.
Arch Phys Med Rehabil. 1994 Dec;75(12):1335-41.
The purpose of this investigation was to determine the relationships among simple methods for measuring effort in below-knee amputee (BKA) and able-bodied (AB) children. Ten BKA children and 13 AB children walked on a treadmill and selected a freely chosen walking speed (CWS). Children then walked for 2 minutes at each of three speeds: CWS, 20% above CWS, and 20% below CWS. Oxygen uptake, heart rate, physiological cost index, percent maximum heart rate, and vertical displacement of a surface marker on the sacrum were determined for each subject and speed. Linear regression with repeated measures was used to determine correlations between oxygen uptake and the four variables (p < 0.05). To evaluate the effectiveness of the regression equations, two male children not part of the AB group were tested. The proportion of explained variance arising from the significant correlations between oxygen uptake and the four measured variables were all between 0.91 and 0.92. It was concluded that the vertical displacement of a marker on the sacrum is a simple and convenient measure for a biomechanics gait laboratory to estimate effort because only standard biomechanics laboratory equipment is required. Further, in a clinical setting and/or where the necessary equipment is available heart rate, physiological cost index, and percent maximum heart rate are also adequate.
本研究的目的是确定测量膝下截肢（BKA）儿童和健全（AB）儿童运动强度的简单方法之间的关系。10名BKA儿童和13名AB儿童在跑步机上行走，并选择自由选择的步行速度（CWS）。然后，儿童以三种速度中的每一种速度行走2分钟：CWS、比CWS高20%以及比CWS低20%。测定了每个受试者和每种速度下的摄氧量、心率、生理成本指数、最大心率百分比以及骶骨表面标志物的垂直位移。采用重复测量的线性回归来确定摄氧量与四个变量之间的相关性（p<0.05）。为了评估回归方程的有效性，对两名不属于AB组的男性儿童进行了测试。摄氧量与四个测量变量之间显著相关性所产生的可解释方差比例均在0.91至0.92之间。得出的结论是，骶骨上标志物的垂直位移对于生物力学步态实验室来说是一种简单方便的测量运动强度的方法，因为只需要标准的生物力学实验室设备。此外，在临床环境中以及/或者在有必要设备的情况下，心率、生理成本指数和最大心率百分比也足够。
