Aprigliano Federica, Martelli Dario, Tropea Peppino, Micera Silvestro, Monaco Vito
Annu Int Conf IEEE Eng Med Biol Soc. 2015;2015:5295-8. doi: 10.1109/EMBC.2015.7319586.
Falls are a major cause of morbidity and death in elderly people. Understanding how subjects maintain stability while walking or while being exposed to perturbations is important in order to prevent falls. Here, five healthy subjects were asked to manage unexpected slipping-like perturbations of increasing intensities (i.e., soft, medium and strong) in order to investigate the effects of the perturbation intensity on the biomechanical behavior and on the dynamical stability, described by the Margin of Stability. The lower limb kinematic (i.e., hip, knee and ankle joints angles) was computed before and after the onset of the perturbation. The compensatory time and the Margin of Stability were calculated after the onset of the perturbation. As expected, results showed that the perturbation altered the subjects' kinematic and the modulation of the perturbation intensity was reflected in the dynamical stability: the stronger was the perturbation, the lower was the Margin of Stability describing a lower balance recovery.
跌倒是老年人发病和死亡的主要原因。了解受试者在行走或受到干扰时如何保持稳定对于预防跌倒很重要。在此，五名健康受试者被要求应对强度不断增加（即轻度、中度和重度）的意外滑倒样干扰，以研究干扰强度对生物力学行为和动态稳定性的影响，动态稳定性由稳定裕度来描述。在干扰开始前后计算下肢运动学参数（即髋关节、膝关节和踝关节角度）。在干扰开始后计算补偿时间和稳定裕度。正如预期的那样，结果表明干扰改变了受试者的运动学，干扰强度的调节反映在动态稳定性上：干扰越强，稳定裕度越低，表明平衡恢复能力越低。
