IEEE Trans Neural Syst Rehabil Eng. 2021;29:113-122. doi: 10.1109/TNSRE.2020.3037128. Epub 2021 Feb 26.
Although it seems intuitive to address the issue of reduced plantar cutaneous feedback by augmenting it, many approaches have adopted compensatory sensory cues, such as tactile input from another part of the body, for multiple reasons including easiness and accessibility. The efficacy of the compensatory approaches might be limited due to the cognitive involvement to interpret such compensatory sensory cues. The objective of this study is to test the hypothesis that the plantar cutaneous augmentation is more effective than providing compensatory sensory cues on improving postural regulation, when plantar cutaneous feedback is reduced. In our experiments, six healthy human subjects were asked to maintain their balance on a lateral balance board for as long as possible, until the balance board contacted the ground, for 240 trials with five interventions. During these experiments, subjects were instructed to close their eyes to increase dependency on plantar cutaneous feedback for balancing. Foam pad was also added on the board to emulate the condition of reduced plantar cutaneous feedback. The effects of tactile augmentation from the foot sole or the palm on standing balance were tested by applying transcutaneous electrical stimulation on calcaneal or ulnar nerve during the balance board tests, with and without a cognitively-challenging counting task. Experimental results indicate that the plantar cutaneous augmentation was effective on improving balance only with cognitive load, while the palmar cutaneous augmentation was effective only without cognitive load. This result suggests that the location of sensory augmentation should be carefully determined according to the attentional demands.
虽然通过增强足底皮肤反馈来解决足底皮肤反馈减少的问题似乎是直观的,但许多方法都采用了补偿性感觉线索,例如来自身体其他部位的触觉输入,原因包括容易获得和易于使用。由于需要认知来解释这种补偿性感觉线索,补偿方法的效果可能会受到限制。本研究的目的是检验以下假设:当足底皮肤反馈减少时,与提供补偿性感觉线索相比,足底皮肤增强更能有效地改善姿势调节。在我们的实验中,要求六名健康的人类受试者尽可能长时间地在侧向平衡板上保持平衡,直到平衡板接触地面,共进行 240 次试验,有 5 种干预措施。在这些实验中,要求受试者闭上眼睛,以增加对平衡的足底皮肤反馈的依赖。还在平衡板上添加泡沫垫,以模拟足底皮肤反馈减少的情况。通过在平衡板测试期间对跟腱或尺神经施加经皮电刺激,同时或不进行认知挑战的计数任务,测试足底或手掌的触觉增强对站立平衡的影响。实验结果表明,足底皮肤增强仅在有认知负荷的情况下有效,而手掌皮肤增强仅在无认知负荷的情况下有效。这一结果表明,根据注意力需求,应仔细确定感觉增强的位置。
IEEE Trans Neural Syst Rehabil Eng. 2021
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