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Paving the Way towards Fatigue-Induced Instability Assessment Using Wearable In-Shoe Pressure Sensors
Sensors ( IF 3.9 ) Pub Date : 2021-05-06 , DOI: 10.3390/s21093217
Guoxin Zhang 1 , Duo Wai-Chi Wong 1, 2 , Ivy Kwan-Kei Wong 1 , Tony Lin-Wei Chen 1 , Tommy Tung-Ho Hong 1 , Yinghu Peng 1 , Yan Wang 1, 2 , Qitao Tan 1 , Ming Zhang 1, 2
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Evaluation of potential fatigue for the elderly could minimize their risk of injury and thus encourage them to do more physical exercises. Fatigue-related gait instability was often assessed by the changes of joint kinematics, whilst planar pressure variability and asymmetry parameters may complement and provide better estimation. We hypothesized that fatigue condition (induced by the treadmill brisk-walking task) would lead to instability and could be reflected by the variability and asymmetry of plantar pressure. Fifteen elderly adults participated in the 60-min brisk walking trial on a treadmill without a pause, which could ensure that the fatigue-inducing effect is continuous and participants will not recover halfway. The plantar pressure data were extracted at baseline, the 30th minute, and the 60th minute. The median of contact time, peak pressure, and pressure-time integrals in each plantar region was calculated, in addition to their asymmetry and variability. After 60 min of brisk walking, there were significant increases in peak pressure at the medial and lateral arch regions, and central metatarsal regions, in addition to their impulses (p < 0.05). In addition, the variability of plantar pressure at the medial arch was significantly increased (p < 0.05), but their asymmetry was decreased. On the other hand, the contact time was significantly increased at all plantar regions (p < 0.05). The weakened muscle control and shock absorption upon fatigue could be the reason for the increased peak pressure, impulse, and variability, while the improved symmetry and prolonged plantar contact time could be a compensatory mechanism to restore stability. The outcome of this study can facilitate the development of gait instability or fatigue assessment using wearable in-shoe pressure sensors.

中文翻译:

使用可穿戴鞋内压力传感器为疲劳诱发的不稳定性评估铺平道路

评估老年人的潜在疲劳可以最大限度地降低他们受伤的风险,从而鼓励他们进行更多的体育锻炼。疲劳相关的步态不稳定性通常通过关节运动学的变化来评估,而平面压力变化和不对称参数可以补充并提供更好的估计。我们假设疲劳状况(由跑步机快走任务引起)会导致不稳定,并且可以通过足底压力的可变性和不对称性来反映。15名老年人在跑步机上不间断地参加了60分钟的快走试验,可以保证疲劳诱导效果持续,参与者不会中途恢复。在基线、第 30 分钟和第 60 分钟提取足底压力数据。接触时间的中位数,计算了每个足底区域的峰值压力和压力-时间积分,以及它们的不对称性和可变性。快走 60 分钟后,内侧和外侧足弓区域以及中央跖骨区域的峰值压力显着增加,除了他们的冲动。p < 0.05)。此外,内侧足弓足底压力的变异性显着增加(p < 0.05),但不对称性降低。另一方面,所有足底区域的接触时间均显着增加(p < 0.05)。疲劳时肌肉控制和减震能力减弱可能是峰值压力、冲动和可变性增加的原因,而对称性的改善和足底接触时间的延长可能是恢复稳定性的一种补偿机制。这项研究的结果可以促进使用可穿戴鞋内压力传感器进行步态不稳定性或疲劳评估。
更新日期:2021-05-06
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