Hutten Miriam M R, Muller Majon T H, Hermens Hermie J
Roessingh Research and Development, Enschede, The Netherlands.
Clin Biomech (Bristol). 1998 Jan;13(1):27-35. doi: 10.1016/s0268-0033(97)00083-1.
The purpose of this study was to investigate differences in consistency between maximum, preferred and a low level trunk performance. It was hypothesized that if maximum effort yielded consistent performances while submaximal efforts were less consistent, a consistency parameter could be used to detect lack of effort. DESIGN: Survey study. METHODS: Eleven healthy subjects performed lumbar dynamometry measurements (Isostation-B200) with maximum, preferred and low effort. A standard protocol was used and velocity and static torque were measured. Five subjects performed three measurements with low effort and trained the low effort level in between to determine the impact of training on consistency of submaximal performances. Coefficient of variations (CV), percentage differences and onset slopes were used to determine consistency. RESULTS: Results show that maximum and preferred effort are equally consistent. Maximum and low effort and preferred and low effort show small significant differences in CV for some velocity and isometric torque parameters. No significant differences between the three performance levels were indicated for percentage differences and onset slopes. Training did not improve the consistency of the measurements. CONCLUSIONS: Small significant differences in CV were found between maximal and submaximal effort. However the combination with the relatively large standard deviations make it unlikely that this parameter can be used for a reliable discrimination.
本研究旨在调查最大、偏好和低水平躯干性能之间的一致性差异。假设如果最大努力产生一致的表现，而次最大努力则不太一致，那么一致性参数可用于检测努力不足。设计：调查研究。方法：11名健康受试者以最大、偏好和低努力程度进行腰椎测力测量（Isostation-B200）。使用标准方案测量速度和静态扭矩。5名受试者以低努力程度进行了3次测量，并在其间训练低努力水平，以确定训练对次最大表现一致性的影响。变异系数（CV）、百分比差异和起始斜率用于确定一致性。结果：结果表明，最大努力和偏好努力同样一致。最大努力与低努力以及偏好努力与低努力在某些速度和等长扭矩参数的CV上显示出小的显著差异。对于百分比差异和起始斜率，三个表现水平之间未显示出显著差异。训练并未改善测量的一致性。结论：在最大努力和次最大努力之间发现CV存在小的显著差异。然而，结合相对较大的标准差，该参数不太可能用于可靠的区分。
