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Application of a chatic stimulation to development of a chair free from backache

聊天刺激在开发无背痛椅子中的应用

基本信息

批准号：
12650225
负责人：
NAGAI Ken-ichi
金额：
$ 0.32万
依托单位：
GUNMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

Vehicles such as airplane, railway and automobile are used for a long distance transportation. During the transportation, passenger is enforced to have a tightened posture especially in the airplane. Therefore, passenger will be affected to a painful stress in muscles of the body. Physical stress in the human body sometimes will happen to be serious hazard to health. To release the stress on the muscle, recently, relaxation machine is introduced with facility of a finger pressure therapy. In the therapy, the body can get a relaxed condition knocked by a fist.This study presents the results of biological signal analysis in human body subjected to periodic and chaotic knocked-stimulation. Electrical signals on a skin of the body are measured. An electricalcardiogram(ECG) is detected from a chest of the body. The signal of an electromyogram (EMG) is measured from muscles of both arms. The maximum Lyapunov exponent is calculated for the signal under test. Using the Karhuen-Loeve transformation (Principal Component Analysis), contributions to the signal of the body under the external stimulation are clarified.It is found that the followings ;1. When the quick periodic knocking is applied to the body, cardiac beat of the heart increases to higher frequency.2. When the body is stricken quickly by the knocking machine, the maximum Lyapunov exponent of the EMG decreases to lower value compared to those of slow knocking condition and the quiet condition. The number of physical parameter contributed to the EMG decreases. It shows that the quick stimulated forces to the body will produce a steady-state periodic response with lower degree of freedom.3. Under three testings of quiet condition, periodic knocking and chaotic excitation, the signals of the ECG show more complex unsteady behavior than that of the responses of EMG.4. Comfortable excitation to the body is found to be the chaotic stimulation by the test in our experiment.

飞机、铁路、汽车等交通工具用于长途运输。在运输过程中，乘客被迫保持紧张的姿势，尤其是在飞机上。因此，乘客的身体肌肉会受到痛苦的压力。人体的生理压力有时会严重危害健康。为了释放肌肉上的压力，最近引入了具有指压疗法功能的放松机。在治疗中，用拳头敲击身体可以达到一种放松的状态。本研究展示了人体受到周期性、混沌敲击刺激后的生物信号分析结果。测量身体皮肤上的电信号。从身体的胸部检测心电图（ECG）。肌电图 (EMG) 信号是通过双臂肌肉测量的。计算被测信号的最大李亚普诺夫指数。利用Karhuen-Loeve变换（主成分分析），阐明了在外部刺激下对身体信号的贡献。发现以下几点；1．当快速周期性的敲击身体时，心脏的跳动频率会增加。2．当身体受到敲击机快速敲击时，与慢速敲击条件和安静条件相比，肌电图的最大李雅普诺夫指数减小到较低值。对肌电图有贡献的物理参数数量减少。结果表明，对身体的快速刺激力会产生自由度较低的稳态周期响应。 3．在安静条件、周期性敲击和混沌激励三种测试下，心电图信号表现出比肌电图响应更复杂的非稳态行为。4。我们的实验测试发现，对身体的舒适刺激是混沌刺激。