At present, the number of senior citizens in the world tends to increase every year. As reported by the World Bank the number of senior citizens in the world is around 0.5 billion people or 8.2% and around 74.3% of them have hypertension [1]. In the same way, the number of Thai senior citizens tends to increase. According to the National Statistical Office, the number of senior citizens in Thailand is around 10 million people or 14.9% [2]. The number of senior citizens shows that Thailand’s society will become a senior’s society soon. From the information of Thai Health Promotion Foundation, senior citizens in Thailand is around 4.1 million people or 41.0% who have high blood pressure or hypertension [3]. High blood pressure is the most common risk factor to other diseases such as stroke, kidney disease, paralysis, and so on. Therefore, high blood pressure is a very important disease that needs to be treated. Nowadays, there are many medical devices that can use to monitor people health in ever day life such as heart rate monitor, glucose monitor, blood pressure monitor, pedometer and weighing scale. Blood pressure monitors are citizens can use these devices to measure blood pressure at home.The hypertension patient should measure the blood pressure and take care oneself at home that is the best way to measure blood pressure [4] [5]. Moreover, most of people do not know the factors that impact the value of blood pressure such as body mass index (BMI), eating too much sodium, eating too less potassium, alcohol addiction, smoking, lack of physical activities, stress and taking the medicine according to the doctor. Thus, they should know more the basic knowledge of hypertension. In 2016, smartphone owner in Thailand is about 24 million people and about 2.5% of them are senior citizens [6]. Recently, Thai people are increasingly interested in self-care but most user interface of self-care applications are not friendly for senior citizens e.g. small text, small button [7]. The main objective of this research work is to design and develop a self-care android application for senior citizens with hypertension to guide, track and treat hypertension and to reduce the risk of having other incurrent diseases. Hence, this oHealth application will be a useful tool for senior citizens with hypertension to take care of themselves. CodeShoppy
ormally, blood pressure when the heart pump blood (systolic) is below 120 mmHg and blood pressure when the heart relaxed (diastolic) is below 80 mmHg. Blood pressure can be changed over time, especially when people sleep, wake up, exercise, stress, or exited. But it will be back to normal blood pressure when people finish their activities. If people finish their activities, but the blood pressure still higher than 120/80 mmHg. This means people can have high blood pressure (Hypertension) [8].High blood pressure can divide into three levels, which are prehypertension (120-139/80-89 mmHg), high blood pressure stage 1 (140-159/90-99 mmHg), and stage 2 (more than 160/100 mmHg) [4]. There are two types of high blood pressure, which consist of primary and secondary high blood pressure. More than 90% of hypertension patients have primary high blood pressure. It is the most common type that occurs in people. And another 10% have secondary high blood pressure. There are many causes, factors and treatmentsof primary and secondary high blood pressure as summarized in Table 1 [8] [9] [10] .
The oHealth system architecture as shown in has five main actors. The first actor is senior citizens with hypertension who can use oHealth by connecting with Wi-Fi or a mobile Internet data in Android device. The second actor is the administrator who maintains the database on Azure SQL Database cloud server. The third actor is doctor, assistant, and family members who receive history data and blood pressure analysis report of senior citizens. The fourth actor is BP5 device which can measure blood pressure. The last actor is azure machine learning which gets all the collected data and analyze hypertension levels for the user. The oHealth application requires the user to register as a member by providing their personal information and log-in. The application offers six main features. The first feature is user profile, which keeps senior’s information. The second feature is measure blood pressure, which measures blood pressure by connecting blood pressure device. The third feature is knowledge, which gives knowledge about hypertension, food, exercise, and medicine. The fourth feature is treatment, which records food dairy, medicine
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