Kuszewski Michał, Gnat Rafał, Sobota Grzegorz, Myśliwiec Andrzej
Department of Kinesitherapy and Special Methods of Physiotherapy, Academy of Physical Education, Katowice, Poland.
Department of Human Motor Behavior, Academy of Physical Education, Katowice, Poland.
J Hum Kinet. 2015 Apr 7;45:49-57. doi: 10.1515/hukin-2015-0006. eCollection 2015 Mar 29.
The aim of the study was to explore whether passive stiffness of the hamstrings influences the strategy of maintaining postural stability. A sample of 50 subjects was selected; the final analyses were based on data of 41 individuals (33 men, 8 women) aged 21 to 29 (mean = 23.3, SD = 1.1) years. A quasi- experimental ex post facto design with repeated measures was used. Categories of independent variables were obtained directly prior to the measurement of the dependent variables. In stage one of the study, passive knee extension was measured in the supine position to assess hamstring stiffness. In stage two, the magnitude of postural sway in antero-posterior direction was measured, while varying the body position on a stabilometric platform, both with and without visual control. The margin of safety was used as a measure of postural control. The magnitude of the margin of safety increased significantly between the open-eye and closed-eye trials. However, although we registered a visible tendency for a larger increase of the margin of safety associated with lower levels of passive hamstrings stiffness, no significant differences were found. Therefore, this study demonstrated that hamstring stiffness did not influence the strategy used to maintain postural stability.
本研究的目的是探讨腘绳肌的被动僵硬度是否会影响维持姿势稳定性的策略。选取了50名受试者作为样本；最终分析基于41名年龄在21至29岁（平均 = 23.3，标准差 = 1.1）的个体（33名男性，8名女性）的数据。采用了带有重复测量的准实验事后设计。自变量类别在测量因变量之前直接获取。在研究的第一阶段，在仰卧位测量被动膝关节伸展以评估腘绳肌僵硬度。在第二阶段，在稳定测力平台上改变身体姿势，分别在有视觉控制和无视觉控制的情况下，测量前后方向的姿势摆动幅度。安全边际用作姿势控制的指标。在睁眼试验和闭眼试验之间，安全边际的幅度显著增加。然而，尽管我们观察到一种明显的趋势，即与较低水平的腘绳肌被动僵硬度相关的安全边际增加幅度更大，但未发现显著差异。因此，本研究表明，腘绳肌僵硬度不会影响用于维持姿势稳定性的策略。
