Center for Health Science Research, Laboratory of Functional Evaluation and Human Motor Performance, Universidade Norte do Paraná (UNOPAR), 675 Paris Ave., CEP 86041-120, Londrina-PR, Brazil.
J Electromyogr Kinesiol. 2013 Jun;23(3):634-9. doi: 10.1016/j.jelekin.2013.01.008. Epub 2013 Feb 10.
Poor posture control has been associated with an increased risk of falls and mobility disability among older adults. This study was conducted to assess the test-retest reliability and sensitivity to group differences regarding the time-limit (TLimit) of one-leg standing and selected balance parameters obtained with a force platform in older and young adults. A secondary purpose was to assess the relationship between TLimit and these balance parameters. Twenty-eight healthy older adults (age: 69±5years) and thirty young adults (age: 21±4years) participated in this study. Two one-leg stance tasks were performed: (1) three trials of 30s maximum and (2) one TLimit trial. The following balance parameters were computed: center of pressure area, RMS sway amplitude, and mean velocity and mean frequency in both the anterio-posterior and medio-lateral directions. All balance parameters obtained with the force platform as well as the TLimit variable were sensitive to differences in balance performance between older and young adults. The test-retest reliability of these measures was found to be acceptable (ICC: 0.40-0.85), with better ICC scores observed for mean velocity and mean frequency in the older group. Pearson correlations coefficients (r) between balance parameters and TLimit ranged from -0.16 to -0.54. These results add to the current literature that can be used in the development of measurement tools for evaluating balance in older and young adults.
姿势控制不良与老年人跌倒和行动障碍风险增加有关。本研究旨在评估在老年和年轻成年人中，使用力台评估单腿站立时间限制（TLimit）和选定平衡参数的重测信度和组间差异的敏感性。次要目的是评估 TLimit 与这些平衡参数之间的关系。28 名健康的老年人（年龄：69±5 岁）和 30 名年轻成年人（年龄：21±4 岁）参加了这项研究。进行了两项单腿站立任务：（1）30 秒最大的三次试验；（2）一次 TLimit 试验。计算了以下平衡参数：压力中心面积、RMS 摆动幅度以及前后和左右方向的平均速度和平均频率。所有使用力台获得的平衡参数以及 TLimit 变量都对老年人和年轻成年人之间的平衡表现差异敏感。这些测量的重测信度被认为是可以接受的（ICC：0.40-0.85），在年龄较大的组中观察到平均速度和平均频率的 ICC 得分更好。平衡参数与 TLimit 之间的 Pearson 相关系数（r）范围为-0.16 至-0.54。这些结果增加了当前的文献，可以用于开发评估老年和年轻成年人平衡的测量工具。
