Pulse oximetry utilizes the technique of photoplethysmography to estimate arterial oxygen saturation (SpO(2)) values. During hypothermia, the amplitude of the photoplethysmograph (PPG) is compromised which can lead to inaccurate estimation of SpO(2). A new mutlimode PPG/pulse oximeter sensor was developed to investigate the behaviour of PPGs during conditions of induced hypothermia (hand immers...

2 Basic implementation ......................................................................................................... 4 2.1 The optoelectronic parts ......................................................................................................... 4 2.2 The electronic circuit .........................................................................................................

The integration of sympathetic and parasympathetic activity with afferent signals from the baroreceptors produces beat-to-beat changes in heart rate and heart rate variability (HRV), which reflects autonomic nervous system (ANS) function. Research has indicated that HRV data should be obtained using an electrocardiogram (ECG) signal rather than a photoplethysmogram (PPG) signal. This study pres...

Pulse transit time (PTT) measured as the time delay between invasive proximal and distal blood pressure (BP) or flow waveforms (invasive PTT [I-PTT]) tightly correlates with BP PTT estimated as the time delay between noninvasive proximal and distal arterial waveforms could therefore permit cuff-less BP monitoring. A popular noninvasive PTT estimate for this application is the time delay between...

Within the brain, glucagon-like peptide-1 (GLP-1) affects central autonomic neurons, including those controlling the cardiovascular system, thermogenesis, and energy balance. Additionally, GLP-1 influences the mesolimbic reward system to modulate the rewarding properties of palatable food. GLP-1 is produced in the gut and by hindbrain preproglucagon (PPG) neurons, located mainly in the nucleus ...

BACKGROUND Modern smartphones allow measurement of heart rate (HR) by detecting pulsatile photoplethysmographic (PPG) signals with built-in cameras from the fingertips or the face, without physical contact, by extracting subtle beat-to-beat variations of skin color. OBJECTIVE The objective of our study was to evaluate the accuracy of HR measurements at rest and after exercise using a smartpho...

The protein picture generator (PPG) is an online service to generate pictures of a protein structure. Its design was conceived as an answer to the need expressed by a part of the community to have some means to produce simply complex pictures to insert in publications or in presentations. PPG can produce static or animated pictures. It can be accessed at http://bioserv.rpbs.jussieu.fr/cgi-bin/PPG.

Heart rate (HR) observation by using photoplethysmography (PPG) signals during intense physical activity is a crucial task because of the fact that PPG signals are affected by the noise due to movement artifacts by the user's hand movements. This paper addresses the discriminating assessment of a novel encapsulation for wearable PPG sensor during the severe physical activity. In this work, we p...

Preformed particle gel (PPG, a kind of Super Absorbent Polymer) has been successfully applied to control conformance in around 2,000 wells in China oilfield. The paper summarizes: (1) why we proposed the method, (2) What are the properties of thermalstable PPG products, (3) where it has been used and how to select a good well candidate for a PPG treatment, (4) how to improve PPG treatment resul...