Design of Wearable Device for Improving the Orthostatic Hypotension during Sit-to-Stand (STS)

  • 蔡 靖慈

Student thesis: Master's Thesis

Abstract

In daily life Sit-to-Stand (STS) is a common movement which occurs averagely 60 times in a day However especially the elderly the most common reasons of fall are the improper posture transition and diverting of mass of body including STS Some people’s vision may go black when they stand up quickly This symptom is caused by Orthostatic Hypotension (OH) when people assume an upright posture Because blood pools in the legs and splanchnic vasculature during STS venous returning to the heart is decreased and subsequently it results in a transient reduction in blood pressure Symptoms of OH including faintness dizziness confusion or blurry vision can cause a person to fall or more seriously to death So far there is no direct therapy can treat OH thoroughly Therefore the purposes of this study are: (1) to integrate the methods of prompting blood circulation; then (2) to develop an innovative design for improving OH and enhancing stability of STS In order to design the automatic device to increase the stability in STS this study integrates the methods of activating blood circulation of lower limbers through interview with experts and observation on STS The new design is developed through focus group Finally an innovative device of keeping stable in STS has been developed in this study This study conducted two experiments The experiment-1 was to evaluate the effect of the new innovative device by measuring trajectory of body center of gravity and variation of blood pressure The participants are indicated to accomplish STS 2 times without device and with device The result of experiment-2 showed that the length of trajectory was shorter and the density was also higher after using new device The experiment-2 was conducted to compare the new device with no device and existing device The participants had to conduct three parts without device with existing device and with new device The result demonstrated that the blood pressure enhanced more obviously while using new device The skin temperature of instep was increased during the period of using new device The result has shown that the new device is capable of stimulating the blood circulation in lower limbs and increasing stability during STS
Date of Award2017 Feb 16
Original languageEnglish
SupervisorFong-Gong Wu (Supervisor)

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