Freitas Sandra M S F, Wieczorek Silvana A, Marchetti Paulo H, Duarte Marcos
Laboratory of Biophysics, School of Physical Education and Sport, University of São Paulo, Av. Prof. Mello de Moraes 65, São Paulo, SP 05508-030, Brazil.
Gait Posture. 2005 Dec;22(4):322-30. doi: 10.1016/j.gaitpost.2004.11.001. Epub 2004 Dec 10.
The aim of this study was to characterize prolonged standing and its effect on postural control in elderly individuals in comparison to adults. It is unknown how elderly individuals behave during prolonged standing and how demanding such a task is for them. We recorded the center of pressure (COP) position of 14 elderly subjects and 14 adults while they performed prolonged standing (30 min) and quiet stance tasks (60s) on a force plate. The number and amplitude of the COP patterns, the root mean square (RMS), speed, and frequency of the COP sway were analyzed. The elderly subjects were able to stand for prolonged periods but they produced postural changes of lesser amplitude and a decreased sway during the prolonged standing task. Both the adults and the elderly subjects were influenced by the prolonged standing task, as demonstrated by their increased COP RMS and COP speed in the quiet standing trial after the prolonged standing task, in comparison to the trial before. We suggest that the lack of mobility in elderly subjects may be responsible for the observed sub-optimal postural changes in this group. The inability of elderly individuals to generate similar responses to adults during prolonged standing may contribute to the increased risk of falls in the older population.
本研究的目的是与成年人相比，描述老年人长时间站立的特征及其对姿势控制的影响。目前尚不清楚老年人在长时间站立过程中的表现以及这样一项任务对他们来说有多艰巨。我们记录了14名老年受试者和14名成年人在测力板上进行长时间站立（30分钟）和安静站立任务（60秒）时的压力中心（COP）位置。分析了COP模式的数量和幅度、COP摆动的均方根（RMS）、速度和频率。老年受试者能够长时间站立，但在长时间站立任务中，他们产生的姿势变化幅度较小，摆动减少。与长时间站立任务之前的试验相比，长时间站立任务后，成年人和老年受试者在安静站立试验中的COP RMS和COP速度均增加，这表明他们都受到了长时间站立任务的影响。我们认为，老年受试者缺乏活动能力可能是导致该组观察到的姿势变化不理想的原因。老年人在长时间站立过程中无法产生与成年人相似的反应，这可能导致老年人群体跌倒风险增加。
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