Visual Biofeedback of Force Information for Eccentric Training of Hemiplegic Patients

Kazuya Morito, Yuri Hasegawa, K. Kubota, T. Tsuji
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Abstract

Motor learning issues for hemiplegics not only include motor impairments such as spastic paralysis, but reportedly also an inability to appropriately recognize somatic sensations. In this regard, biofeedback of movement information through visual information and auditory information has been found effective as a method for drawing attention to appropriate somatic sensations. In this context, here, we propose a novel eccentric training system utilizing visual biofeedback of force information. We first develop a compact and highly portable rehabilitation robot for home use. The robot estimates the force on the tiptoe without the use of a force sensor, and a display connected to the robot presents the force information to the trainee. Clinical trials with two chronic hemiplegics have been conducted. The results show that the timed up and go tests of both trainees are shortened after training twice a week for three weeks (six times in total). Simultaneously, the co-contraction index scores of the tibialis anterior and gastrocnemius muscles decrease. These findings in conjunction with previous results suggest that training with visual biofeedback of force information may enhance reciprocal inhibition of the tibialis anterior muscle and reduces co-contraction.
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偏瘫患者偏心训练力信息的视觉生物反馈
偏瘫患者的运动学习问题不仅包括痉挛性麻痹等运动障碍,而且据报道还包括无法适当地识别躯体感觉。在这方面,通过视觉信息和听觉信息的运动信息的生物反馈已被发现是一种有效的方法,以提请注意适当的身体感觉。在此背景下,我们提出了一种利用视觉生物反馈力信息的新颖偏心训练系统。我们首先开发了一种紧凑、高度便携的家庭康复机器人。机器人在不使用力传感器的情况下估计脚尖上的力,并且连接到机器人的显示器将力信息呈现给受训者。对两例慢性偏瘫患者进行了临床试验。结果表明:两名学员每周训练2次,共6次,连续训练3周后,两名学员的计时up和go测试都缩短了。同时,胫前肌和腓肠肌的共收缩指数得分下降。这些发现与先前的结果相结合,表明视觉生物反馈力信息训练可以增强胫骨前肌的相互抑制并减少共同收缩。
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