A Novel Photoplethysmography Sensor for Vital Signs Monitoring from the Human Trachea

May, James M.; Phillips, Justin P.; Fitchat, Tracey; Ramaswamy, Shankar; Snidvongs, Saowarat; Kyriacou, Panayiotis A.

doi:10.3390/bios9040119

Cited by 9 publications

(12 citation statements)

References 19 publications

(17 reference statements)

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“…Other studies describe a SO 2 decrease at maximum effort and an apparent increase in the desaturation time, T Des , proportional to the VO 2,max [49,60,101]. For example, the highest VO 2,max values reported in trained subjects were obtained in individuals engaged in endurance modalities with values above 75 mL/kg/min [102].…”

Section: Discussionmentioning

confidence: 99%

“…The current progress of wearable sensors for continuous monitoring of physiological variable parameters has given evidence that using this technology to measure and quantify human responses to exercise has worthiness in improving the understanding of the exercise effects [42][43][44][45][46][47]. In particular, heart rate (HR) and oxygen saturation determination by photoplethysmography (PPG) constitute a key factor that provides relevant information to personalize training interventions [48][49][50][51][52]. The PPG sensor monitors differences in the light intensity between blood and the surrounding tissue [53,54].…”

Section: Introductionmentioning

confidence: 99%

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Oxygen Saturation Behavior by Pulse Oximetry in Female Athletes: Breaking Myths

et al. 2021

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The myths surrounding women’s participation in sport have been reflected in respiratory physiology. This study aims to demonstrate that continuous monitoring of blood oxygen saturation during a maximal exercise test in female athletes is highly correlated with the determination of the second ventilatory threshold (VT2) or anaerobic threshold (AnT). The measurements were performed using a pulse oximeter during a maximum effort test on a treadmill on a population of 27 healthy female athletes. A common behavior of the oxygen saturation evolution during the incremental exercise test characterized by a decrease in saturation before the aerobic threshold (AeT) followed by a second significant drop was observed. Decreases in peripheral oxygen saturation during physical exertion have been related to the athlete’s physical fitness condition. However, this drop should not be a limiting factor in women’s physical performance. We found statistically significant correlations between the maximum oxygen uptake and the appearance of the ventilatory thresholds (VT1 and VT2), the desaturation time, the total test time, and between the desaturation time and the VT2. We observed a relationship between the desaturation time and the VT2 appearance. Indeed, a linear regression model between the desaturation time and the VT2 appearance can predict 80% of the values in our sample. Besides, we suggest that pulse oximetry is a simple, fairly accurate, and non-invasive technique for studying the physical condition of athletes who perform physical exertion.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxygen Saturation Behavior by Pulse Oximetry in Female Athletes: Breaking Myths

et al. 2021

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“…For the first time a vessel-tissue phantom has been produced with geometrically vessels. When integrated into a pulsatile pump the tissue exhibited similar morphological features to a physiological PPG signal with similar signal to noise ratios [16]. The custom vessels were produced at four withdrawal speeds, which had an impact on two factors.…”

Section: In Vitro Systemmentioning

confidence: 98%

Fabricating Novel PDMS Vessels for Phantoms in Photoplethysmography Investigations

Nomoni

May

Kyriacou

2020

2020 42nd Annual International Conference of the IEEE Engineering in Medicine &Amp; Biology Society (EMBC)

Self Cite

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This paper introduces a novel technique for the development of custom polydimethylsiloxane (PDMS) vessels for use in phantom technologies. The method involves continuous dip coating of commercial silicone tubes with rapid curation in a single controlled process. The technique accommodates the production of different vessel diameters, wall thicknesses (56 μm-80 μm) and mechanical properties. Clear phantoms were fabricated to compare the commercial silicone tubes against the customs vessels. A pulsatile fluidic pump (BDCLabs, CO, USA) driven by a computer controlled linear motor generated the pulsatile flow through the phantom. The resulting flow profile, using the custom vessels, simulates human blood flow and the detected contact PPG signal from the phantom closely resembles the morphology of in vivo PPG waveforms with signal-to-noise ratios of 38.16 dB and 40.59 dB, compared to the closest commercially-available tubing at 5.38 dB and 10.59 dB for the red and infrared wavelengths respectively. The rigidity and thick walls of commercial silicone tubes impede the expansion of the tubing under systolic pressure. This technique eliminates this common limitation in phantom development.

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“…It may lead to a unique and robust optically based sensor for the measurement of temperature variation, hemoglobin presence, heart rate and blood oxygen saturation spO 2 . The spO 2 is measured on basis of hemoglobin bound to the oxygen and on different wavelengths of light-red (660 nm—deoxygenated blood) and near-infrared (890 nm—oxygenated blood) [ 158 , 159 , 160 , 161 ]. In rare cases e.g., (people suffering from chronic anxiety) a stressful situation can cause respiratory complications and subsequent depletion of spO 2 .…”

Section: Physiological Variables In Stress Measurementmentioning

confidence: 99%

The Concept of Advanced Multi-Sensor Monitoring of Human Stress

Vavrinský

Stopjaková

Kopáni

et al. 2021

Sensors

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Many people live under stressful conditions which has an adverse effect on their health. Human stress, especially long-term one, can lead to a serious illness. Therefore, monitoring of human stress influence can be very useful. We can monitor stress in strictly controlled laboratory conditions, but it is time-consuming and does not capture reactions, on everyday stressors or in natural environment using wearable sensors, but with limited accuracy. Therefore, we began to analyze the current state of promising wearable stress-meters and the latest advances in the record of related physiological variables. Based on these results, we present the concept of an accurate, reliable and easier to use telemedicine device for long-term monitoring of people in a real life. In our concept, we ratify with two synchronized devices, one on the finger and the second on the chest. The results will be obtained from several physiological variables including electrodermal activity, heart rate and respiration, body temperature, blood pressure and others. All these variables will be measured using a coherent multi-sensors device. Our goal is to show possibilities and trends towards the production of new telemedicine equipment and thus, opening the door to a widespread application of human stress-meters.

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A Novel Photoplethysmography Sensor for Vital Signs Monitoring from the Human Trachea

Cited by 9 publications

References 19 publications

Oxygen Saturation Behavior by Pulse Oximetry in Female Athletes: Breaking Myths

Oxygen Saturation Behavior by Pulse Oximetry in Female Athletes: Breaking Myths

Fabricating Novel PDMS Vessels for Phantoms in Photoplethysmography Investigations

The Concept of Advanced Multi-Sensor Monitoring of Human Stress

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