Reduced plantar sensitivity alters postural responses to lateral perturbations of balance
Reduced plantar sensitivity alters postural responses to lateral perturbations of balance
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DOI：
10.1007/s00221-004-1868-3
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发表时间：
2004-08-01
影响因子：
2
通讯作者：
De Luca, CJ
中科院分区：
文献类型：
--
作者：
Meyer, PF;Oddsson, LIE;De Luca, CJ
有相当多的证据表明，下肢躯体感觉有助于直立平衡的控制。在这项研究中，我们研究了足底皮肤传入神经在支撑面横向加速后产生平衡校正中的具体作用。参与者在皮内注射局麻药诱导的皮肤足底定向麻醉前后受到平衡扰动。受试者的反应被量化为踝关节、髋部和躯干的关节净扭矩。与早期研究得出的结论相反，在控制和麻醉条件下，脚踝和臀部的响应扭矩脉冲明显与扰动脉冲成比例。足底敏感性的降低导致补偿扭矩产生从脚踝和躯干到臀部的相对转移。这些发现表明足底皮肤传入神经在动态姿势反应的形成中起重要作用。此外，研究结果表明，足底感觉的丧失可能是动态平衡缺陷和周围神经病变相关跌倒风险增加的重要因素。
There is considerable evidence that lower-limb somatosensation contributes to the control of upright balance. In this study, we investigated the specific role of foot sole cutaneous afferents in the generation of balance corrections following lateral accelerations of the support surface. Participants were subjected to balance perturbations before and after targeted anesthesia of the cutaneous soles induced by intradermal injections of local anesthetic. Subject responses were quantified in terms of net joint torques at the ankles, hips and trunk. Contrary to the conclusions drawn in earlier studies, response torque impulses at the ankles and hips were clearly scaled with the perturbation impulse under both control and anesthetized conditions. Reduced plantar sensitivity produced a relative shift in compensatory torque production from the ankles and trunk to the hips. These findings demonstrate that plantar cutaneous afferents play an important role in the shaping of dynamic postural responses. Furthermore, the results suggest that loss of plantar sensation may be an important contributor to the dynamic balance deficits and increased risk of falls associated with peripheral neuropathies.