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This paper proposes to use the pulse transit time variability (PTTV) as an indicator of the variability in hemodynamics and studies its correlation with other cardiovascular variabilities, especially the blood pressure variability (BPV), which receives increasing attentions as an independent indicator of autonomic regulation and abnormalities in cardiovascular system. Continuous blood pressure (BP),...
With the evolution of m-Health, an increasing number of biomedical sensors will be worn on or implanted in an individual in the future for the monitoring, diagnosis, and treatment of diseases. For the optimization of resources, it is therefore necessary to investigate how to interconnect these sensors in a wireless body area network, wherein security of private data transmission is always a major...
This study examines the recoverability trend of blood pressure (BP) and pulse transit time (PTT) during the 60 minutes immediately following a treadmill exercise. Experiments were conducted on 12 healthy and normotensive subjects, including 8 males and 4 females. All subjects were directed to run on a treadmill at 10 kph for 4 minutes. BP was measured at the finger by the Finometer and also at brachial...
Pulse transit time (PTT) has attracted great interest for developing continuous and noninvasive blood pressure (BP) monitoring devices. This study investigated the effect of finger cold exposure on PTT. 13 healthy and normotensive subjects, including 6 males and 7 females took part in the experiment. Cold exposure was performed by asking subjects to immerse one finger into cold water (9plusmn2degC)...
Pulse transit time (PTT) is a simple non-invasive method to evaluate vascular function using photoplethysmography (PPG) and electrocardiography (ECG). This study introduces unconstrained PTT measurement method for computer users and evaluates that. The proposed system consists of chair and mouse those can measure ECG and PPG respectability. PTT was defined as time delay between ECG R peak and PPG...
In order to detect hypertension at its early stage, blood pressure (BP) of an individual must be carefully monitored. Aiming to monitor BP noninvasively and continuously, this study examines a new feature, normalized harmonic area (NHA), which is extracted from photoplethysmographic (PPG) signals in the period domain by using the discrete period transform (DPT). BP, pulse transit time (PTT), diastolic...
To evaluate the biological effects of visual stimulation on multiple subjects watching a same image, a more compact and low-cost device measuring both ECG and photo-plethysmogram was developed. On the basis of these physiological parameters, the maximum cross-correlation coefficient, rhomax, from pulse wave transmission time to heart rate could be calculated. This index reflects the activity of the...
Pulse transit time (PTT) is one of the physiological parameters that can be utilized to estimate arterial blood pressure (BP) non-invasively. However, the effects of successive exercises on the relationship between PTT and BP have not yet been studied systematically. This study examines the variation in PTT and BP on 15 healthy subjects after treadmill exercise. PTT-peak and PTT-foot, which represent...
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