Demura Shin-Ichi, Kitabayashi Tamotsu, Aoki Hiroki
Department of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa, Japan.
Geriatr Gerontol Int. 2008 Sep;8(3):188-97. doi: 10.1111/j.1447-0594.2008.00469.x.
This study aimed to determine the reliability and sex and age-level differences of body-sway parameters, based on center of pressure (COP) measurements, during a static upright posture in the elderly and to clarify their body-sway characteristics in comparison with those of young adults.
The subjects were 50 healthy elderly and 50 healthy young adults. They had no evidence or known history of disorder. The data sampling frequency was 20 Hz. Thirty-six highly reliable parameters were selected from the following seven domains: distance; position; distribution of amplitude; area; velocity; power spectrum; and vector. In addition, four body-sway factors (unit time sway, front-back sway and a left-right sway and the high-frequency band power) were also measured.
In the elderly, most body-sway parameters had very high reliability and did not show significant sex or age-level differences. The degree of body sway was greater in the elderly than in young adults, and marked differences were found, especially in sway velocity and periodicity. The four body-sway factors showed almost the same tendency as the 32 sway parameters.
We judged that the body sway in the elderly showed large individual differences. Approximately 10% of the elderly subjects may be outside the standard range as compared to young adults, mainly in parameters relating to velocity and spectrum. Because the body-sway characteristics of the elderly are considerably different from those of young adults, we may need unique criteria to evaluate their body sway.
本研究旨在确定基于压力中心（COP）测量的老年人静态直立姿势下身体摆动参数的可靠性以及性别和年龄水平差异，并与年轻人相比阐明其身体摆动特征。
受试者为50名健康老年人和50名健康年轻人。他们没有疾病证据或已知病史。数据采样频率为20Hz。从以下七个领域中选择了36个高度可靠的参数：距离；位置；幅度分布；面积；速度；功率谱；和矢量。此外，还测量了四个身体摆动因素（单位时间摆动、前后摆动、左右摆动和高频带功率）。
在老年人中，大多数身体摆动参数具有非常高的可靠性，并且没有显示出显著的性别或年龄水平差异。老年人的身体摆动程度大于年轻人，并且发现了明显差异，特别是在摆动速度和周期性方面。四个身体摆动因素与32个摆动参数显示出几乎相同的趋势。
我们判断老年人的身体摆动存在较大个体差异。与年轻人相比，约10%的老年受试者可能超出标准范围，主要在与速度和频谱相关的参数方面。由于老年人的身体摆动特征与年轻人有很大不同，我们可能需要独特的标准来评估他们的身体摆动。
