Yu B, Growney E S, Schultz F M, An K N
Orthopedic Biomechanics Laboratory, Mayo Clinic, Rochester, MN 55905, USA.
J Biomech. 1996 Dec;29(12):1625-8.
A stairway that allows the collection of kinetic data is essential for biomechanical studies on stair climbing. There is a need to validate the measured center of pressure (COP) on the surface of a stair in order to verify the accuracy of the calculation of joint kinetics. The purpose of this study was to validate a new stairway design for kinetic analysis of stair climbing through a calibration and error analysis of the COP obtained from this system. The new stairway design allows the collection of kinetic data for multiple steps without any constraint to foot placement. Known vertical forces were applied to known locations on the surface of each stair and each force plate. Multiple regression analyses were conducted to determine the distribution pattern of the error in the measured COP. It was found that the error in the COP was a function of location on the stair or force plate. The magnitude of the vertical force had no significant effect on the error in the measured COP. The distribution pattern of the error in the measured COP on the force plates used in this study matched the results in the literature. A healthy female subject was used as a subject in a stair climbing test. The error in the measured COP had a significant effect on the calculated joint resultant moments, especially the abduction-adduction and internal-external rotation moment. The correction of these errors should make the kinetic calculation in stair climbing more accurate.
对于楼梯攀爬的生物力学研究而言，一个能够收集动力学数据的楼梯至关重要。有必要对楼梯表面测得的压力中心（COP）进行验证，以核实关节动力学计算的准确性。本研究的目的是通过对该系统获得的COP进行校准和误差分析，来验证一种用于楼梯攀爬动力学分析的新型楼梯设计。这种新型楼梯设计允许在无脚部放置限制的情况下收集多个台阶的动力学数据。将已知的垂直力施加到每个楼梯和每个测力板表面的已知位置。进行了多元回归分析，以确定测得的COP误差的分布模式。结果发现，COP误差是楼梯或测力板上位置的函数。垂直力的大小对测得的COP误差没有显著影响。本研究中使用的测力板上测得的COP误差分布模式与文献中的结果相符。一名健康女性受试者被用作楼梯攀爬测试的对象。测得的COP误差对计算出的关节合力矩有显著影响，尤其是外展-内收和内外旋转力矩。对这些误差的校正应会使楼梯攀爬中的动力学计算更加准确。
