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Current work is a part of long term research, which aim is to study the possibilities to diagnose the atherosclerosis in early stadium by using pulse wave velocity and its waveform analysis. The mobile experimental measurement complex is built and technically tested for the long term study in hospital. Measurement complex consists of ten physiological signal recording channels and reference devices:...
A non-invasive and portable apparatus is designed for the early detection of vascular stiffness in community use. The device is based on embedded system. It collects electrocardiograph (ECG) and plethysmograph (PPG) signals from human body, calculates characteristic parameters that reflect the state of the blood vessel and displays them on LCD real-time. Also, a network communication module is integrated...
This work presents the study of a compressed sensing implementation in a system which acquires three cardiac signals, ballistocardiogram, electrocardiogram and photoplethysmogram. In order to accurately estimate heart rate and its variability, cardiac signals must be acquired at frequencies of about 1 kHz, but since these signals have a sparse representation in some transformation basis, namely in...
Arterial stiffness is an important index for cardiovascular events. The objective of this study is to examine possible parameters related to arterial stiffness that can be estimated during simple arm movements. An experiment was conducted on 32 subjects divided into two groups, one with an age of 26plusmn4 years old, and the other 61plusmn9. The pulse transit time measured from electrocardiogram to...
We developed an arrhythmic pulse detection algorithm from photoplethysmography (PPG) measured in daily life using a wearable PPG sensor, in order to provide a simpler device than a Holter electrocardiograph (ECG). However, PPG is very sensitive to artifacts in daily life, e.g. body movement. First, we analyzed the correlation between the ECG and the PPG measured at the same time when the arrhythmic...
Stress is one of the most common reasons for a number of serious diseases. For the prevention and treatment of stress, a psycho-physiological monitoring system for stress measurement is needed. Because of the multifarious influences of stress on the physiological response of the body, a stress measurement system has to take into account as many parameters as possible. The pulse transit time (PTT),...
For the upcoming ubiquitous computing environments in the u-health areas involve the measurement of physiological signals in the daily life. However, the measurement of those signals, such as the photoplethysmography (PPG), and the electrocardiogram (ECG), requires being still tight during the measurement in order to get the accurate result preventing noises caused by the casual movement. In this...
This paper proposes a new method for evaluating the autonomic nervous activities by using the mechanical impedance of the arterial wall and heart rate variability. The cardiovascular system is indispensable to life maintenance functions, and homeostasis is maintained by the autonomic nervous system. It is very important to give a diagnosis based on the autonomic nervous activities of the whole body...
Pulse transit time (PTT) has been widely used for noninvasive examination of the arterial viscoelastic properties, such as elasticity, compliance, and stiffness of the vessel walls. PTT is usually determined as the time interval between the peak of the electrocardiogram R wave and the foot of the photoplethysmogram (PPG). However, it was observed that the PPG is affected by the applied contact force...
The aim of this study is to determine if a noninvasive and cuffless blood pressure (BP) estimation method using pulse transit time (PTT) can accurately track the changes in BP after a treadmill exercise. Experiments were conducted on 12 healthy subjects, who were directed to run on a treadmill at 10 kph for 4 minutes. For each subject, 13 trials were recorded in total, including 11 trials obtained...
The aim of this study is to determine if a noninvasive and cuffless blood pressure (BP) estimation method using pulse transit time (PTT) can accurately track the changes in BP after a treadmill exercise. Experiments were conducted on 12 healthy subjects, who were directed to run on a treadmill at 10 kph for 4 minutes. For each subject, 13 trials were recorded in total, including 11 trials obtained...
Pressure is one of the most sensitive factors influencing the arterial wall compliance. Pulse transit time (PTT) is one simple way to assess arterial compliance changes. This study investigated the relationship between external cuff pressure and pulse transit time. The study was performed on 10 subjects with different cuff pressures (0, 10, 20 and 30 mmHg) on the lower arm, upper arm and whole arm...
In order to study the underlying physiological process of photo-electrical activities and understand its physical generation mechanism, the photoplethysmogphic (PPC) signals at the fingertip were recorded simultaneously with the corresponding ECG signals from normal human subjects under the following conditions: a) at the rest or relaxed state; and (b) at different levels of contacting forces applied...
This paper gives an overview of a research, which is focused on the development of the convenient device for continuous non-invasive monitoring of arterial blood pressure. The blood pressure estimation method is based on a presumption that there is a singular relationship between the pulse wave propagation time in arterial system and blood pressure. The parameter used in this study is pulse wave transit...
Pulse transit time (PTT) is important in the study of arterial viscoelastic properties, wave reflections and sympathetic activities. PTT is usually defined as the time interval between the R-wave in the electrocardiogram (ECG) and a characteristic point in the photoplethysmogram. However, it was found that photoplethysmographic signals are affected by the contacting force between the photoplethysmographic...
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