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首页> 外文会议>International Symposium on Medical Measurements and Applications >Measuring age-related differences in kinematic postural strategies under yaw perturbation
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Measuring age-related differences in kinematic postural strategies under yaw perturbation

机译：在偏航摄动下测量运动姿势策略中与年龄相关的差异

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The assessment of age-related postural strategies under external perturbation is of great interest for a better evaluation of the risk of falls in healthy humans. In the large majority of the studies, subjects have been perturbed with antero/posterior translations or rotations in the pitch and roll angles in order to investigate the postural strategies adopted for balance control. However, physiological mechanisms involved in the response to continuous yaw perturbation to maintain stable balance in healthy subjects are still unclear. Ten younger subjects (age: 28±3 years) and ten older adults (age: 61±4 years) were asked to stand on the RotoBiT1Dunder two visual conditions: (a) eyes opened looking at a fixation point, and (b) eyes closed. The platform, driven by an ad-hoc control software, provided two sinusoidal rotations on the horizontal plane with fixed amplitude (±55°) and two different frequencies (0.2 Hz and 0.3 Hz). Kinematics of head, trunk, pelvis, arms, forearms, thighs and shanks body-segments was gathered using eleven inertial measurement units. Body-segment absolute rotations in the transverse plane were compared to platform absolute rotation after fast Fourier transform. The gain (G) and phase lag (Φ) of all body-segments were computed and analyzed as a function of age, visual and frequency conditions. G values were statistically lower in older subjects than in younger subjects for all body-segments attesting prominent stiffness and limited ranges of movement. Regarding Φ, our results demonstrated that in older subjects, lower limbs, trunk and pelvis anticipated platform movement probably compensating for postural perturbations. In both groups, G decreased and Φ delayed progressively by increasing the frequency of the perturbation while similar results were obtained comparing the two visual conditions. In conclusion, to maintain balance under sinusoidal yaw perturbation, older subjects adopted a different motor control strategy compared with younger subjects mainly implying reduced body-movements and the anticipation of the movement.
机译：对外部扰动下与年龄有关的姿势策略的评估对于更好地评估健康人跌倒的风险非常重要。在大多数研究中，受试者被前/后平移或俯仰角和侧倾角的旋转所扰动，以研究为平衡控制所采用的姿势策略。然而，在健康受试者中，对持续偏航微扰的响应以维持稳定平衡的生理机制仍不清楚。十名年轻受试者（年龄：28±3岁）和十名成年人（年龄：61±4岁）被要求站在RotoBiT上 1D 在两种视觉条件下：（a）睁开眼睛看着注视点，（b）闭上眼睛。该平台由ad-hoc控制软件驱动，在水平面上提供了两个固定振幅（±55°）和两个不同频率（0.2 Hz和0.3 Hz）的正弦旋转。使用11个惯性测量单元收集了头部，躯干，骨盆，手臂，前臂，大腿和小腿肢体的运动学信息。快速傅里叶变换后，将横断面上的身体段绝对旋转与平台绝对旋转进行了比较。根据年龄，视觉和频率条件计算并分析所有人体段的增益（G）和相位滞后（Φ）。对于所有身体段，G值在统计学上均低于年轻受试者，证明了其明显的刚度和有限的运动范围。关于Φ，我们的结果表明，在年龄较大的受试者中，下肢，躯干和骨盆预期的平台运动可能会补偿姿势干扰。在两组中，通过增加摄动的频率，G减小并且Φ逐渐延迟，同时比较两种视觉条件获得了相似的结果。总之，为了在正弦偏航摄动下保持平衡，与年轻受试者相比，老年受试者采用了不同的运动控制策略，这主要意味着身体运动减少和运动预期。

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