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首页> 外文期刊>Gait & posture >Does head extension and flexion increase postural instability in elderly subjects when visual information is kept constant?
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Does head extension and flexion increase postural instability in elderly subjects when visual information is kept constant?

机译：当视觉信息保持恒定时，头部伸展和屈曲会增加老年人的姿势不稳定性吗？

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摘要

The present study determined the effects of flexing and extending the head on the postural stability and mean anterior-posterior (A-P) center of mass (CM) position during upright stance in the elderly. To ensure visual input to stability was not a confounding variable, visual information was kept as constant as possible for all head positions. Twelve healthy elderly subjects (72.3 +/- 4.7 years) were asked to stand stationary on a single force-platform. Postural stability (assessed using the rms A-P excursion of the center of pressure (CP)) was determined for standing with the head erect, and with the head flexed and extended. The vestibular contribution to postural stability becomes increasingly important under challenging conditions, so to highlight the effects of vestibular system input, measurements of postural stability under conditions where visual and somatosensory inputs were disrupted were included. Changes in the mean A-P CM position when tilting the head were assessed by determining changes in the mean A-P location of the CP from standing with the head erect. Compared to standing with the head erect and looking straight ahead, postural stability was reduced when the head was flexed or extended (P < 0.01). Changes in mean A-P CM position were only significant when standing with the head flexed (P < 0.05). This suggests that increases in postural instability with the head tilted from the erect position may be in part due to mechanical perturbation rather than solely vestibular disruption.
机译：本研究确定了在老年人直立姿势期间屈曲和伸展头部对姿势稳定性和平均前后位（A-P）重心（CM）位置的影响。为了确保稳定的视觉输入不是一个混杂的变量，对于所有头部位置，视觉信息应尽可能保持恒定。要求十二名健康的老年受试者（72.3 +/- 4.7岁）在单个测力平台上站立不动。确定姿势稳定性（使用压力中心的均方根A-P偏移（CP）评估），以直立头部，弯曲头部和伸展头部以站立。在具有挑战性的条件下，前庭对姿势稳定性的贡献变得越来越重要，因此，为了强调前庭系统输入的影响，包括了视觉和体感输入受到干扰的条件下姿势稳定性的测量。通过确定头部直立站立后CP的平均A-P位置的变化，来评估倾斜头部时平均A-P CM位置的变化。与头部直立并向前看相比，头部弯曲或伸展时的姿势稳定性降低（P <0.01）。仅当头部弯曲站立时，A-P CM平均位置的变化才有意义（P <0.05）。这表明随着头部从直立位置倾斜，姿势不稳定性的增加可能部分是由于机械扰动，而不是单纯的前庭破坏。

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