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Journal Physiol Meas

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The use of multi-site photoplethysmography (PPG) as a screening tool for coronary arterial disease and atherosclerosis.

Victoria Ouyang, Botong Ma, Niccolo Pignatelli, Shantanu Sengupta, Partho Sengupta, Kunda Mungulmare, Richard Ribón Fletcher,

OBJECTIVE:Validation of a non-invasive smart-phone based screening tool for atherosclerosis and coronary arterial disease (CAD), which is the leading cause of mortality worldwide. METHODS:We designed a three-channel photoplethysmography (PPG) device that connects to a smart phone application for measuring pulse transit time (PTT) and pulse wave velocity (PWV) using PPG ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Decreased low-frequency brain effective connectivity in seafarers during voyages: a functional near-infrared spectroscopy study.

Lingguo Bu, Ning Xu, Yonghui Wang, Heshan Liu,

Objective During voyages, seafarers experience psychological problems that act to decrease operational safety. Psychological problems in seafarers can lead to changes in functional brain networks. This study investigated the low-frequency brain effective connectivity (EC) in seafarers during voyages by using the coupling strength (CS) of functional near-infrared spectroscopy (fNIRS) imaging. ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Reliability, reproducibility and validity of dynamic cerebral autoregulation in a large cohort with transient ischaemic attack or minor stroke.

Yun-Kai Lee, Peter M Rothwell, Stephen John Payne, Alastair J S Webb,

OBJECTIVE:Cerebral autoregulation (CA) is critical to maintenance of cerebral perfusion but its relevance to the risk of stroke and dementia has been under-studied due to small study sizes and a lack of consensus as to the optimal method of measurement. We determined the reliability and reproducibility of multiple CA indices ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Noninvasive real-time detection of cerebral blood perfusion in hemorrhagic shock rabbits based on whole-brain magnetic induction phase shift: an experimental study.

Wencai Pan, Wei Zhuang, Yinbao Chong, Mingxin Qin, Yang Li, Jingjing Xiao, Qing Wang, Shihui Zhang, Shanglin Zhao, Peng Zhao,

OBJECTIVE:This study aimed to perform experiments to investigate the change trend in brain magnetic induction phase shift (MIPS) during hemorrhagic shock of different degrees of severity and to find the correlation between brain MIPS value and commonly used physiological indicators for detecting shock so as to explore a noninvasive method ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Monitoring bronchoalveolar lavage with electrical impedance tomography: first experience in a patient with COVID-19.

Yingyun Fu, Rongrong Zou, Shouhong Wang, Junmin Wen, Lei Rong, Ming Tang, Baojun Yu, Fulan Cen, Zhanqi Zhao, Inez Frerichs, Andy Adler, Yingxia Liu, Lei Liu,

OBJECTIVE:Patients with the novel coronavirus disease (COVID-19) often have airways secretions that severely compromise ventilation. This study investigates electrical impedance tomography (EIT) monitoring of a therapeutic bronchoalveolar lavage (BAL) in a patient with COVID-19. APPROACH:A patient with COVID-19 developed acute respiratory distress syndrome requiring mechanical ventilation. He received regional BAL ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Comparison of different modulations of photoplethysmography in extracting respiratory rate: from a physiological perspective.

Haipeng Liu, Fei Chen, Vera Hartmann, Syed Ghufran Khalid, Stephen Hughes, Dingchang Zheng,

OBJECTIVE:Based on different physiological mechanisms, respiratory modulations of photoplethysmography (PPG) signal differ in strength and resultant accuracy of respiratory frequency (RF) estimation. We aimed to investigate the strength of different respiratory modulations and the accuracy of resultant RF estimation in different body sites and two breathing patterns. APPROACH:PPG and reference ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Comparison between bioelectrical impedance spectroscopy measurements and water volume displacement of ankle oedema variations during the course of a day.

Amalric Montalibet, Didier Rastel, Cyril Chaigneau, Etienne Grenier, Eric T McAdams,

OBJECTIVE:The purpose of this study was to find relationships between variations in bioelectrical impedance spectroscopy (BIS) measurements and those obtained by water displacement (WD) and calf (C) and ankle (A) perimetry on legs of patients with venous insufficiency and lower limb oedema, some with Positive Pitting Test (PPT), others with ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Deep neural network for estimating the bladder boundary using electrical impedance tomography.

Sravan Kumar Konki, Anil Kumar Khambampati, Sunam Kumar Sharma, Kyung Youn Kim,

OBJECTIVE:Accurate bladder size estimation is an important clinical parameter that assists physicians to provide better treatment for patients who are suffering from urinary incontinence (UI). Electrical impedance tomography (EIT) is a non-invasive medical imaging method that estimates organ boundaries assuming that the electrical conductivity values of background, bladder, and adjacent ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Evaluation of electrical properties ofex vivohuman hepatic tissue with metastatic colorectal cancer.

Varun Lochab, Travis H Jones, Emily Alkandry, Joseph D West, Mohamed Abdel-Rahman, Vish V Subramaniam, Shaurya Prakash,

Electrochemical impedance spectroscopy (EIS) was used for distinguishing spatial heterogeneities in fresh, unfixed human hepatic tissues ex vivo from patients with metastatic colorectal cancer (CRC). Point-wise impedance measurements reported over a frequency range of 100 Hz - 1 MHz showed that the interface tissue between visible tumor and normal tissue ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Amplitude spectrum trend-based feature for excitation location classification from snore sounds.

Jingpeng Sun, Xiyuan Hu, Chen Chen, Silong Peng, Yan Ma,

OBJECTIVE:Successful surgical treatment of obstructive sleep apnea (OSA) depends on precisely locating the tissue of vibration. Snoring is the main symptom of OSA and can be utilized to detect the active location of tissues. However, existing approaches are limited owing to their inability to capture the characteristics of snoring produced ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Automated identification of the predominant site of upper airway collapse in obstructive sleep apnoea patients using snore signal.

Arun Sebastian, Peter Cistulli, Gary Cohen, Philip de Chazal,

This study provides a novel approach for an automated system using a machine learning algorithm to predict the predominant site of upper airway collapse into four classes ("lateral wall", "palate", "tongue-base" related collapse or "multi-level" site-of-collapse) in Obstructive Sleep Apnoea (OSA) patients from the audio signal recorded during normal sleep. ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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A portable device with low-power consumption for monitoring mouse vital signs during in vivo photoacoustic imaging and photothermal therapy.

Duc Tri Phan, Thi Tuong Vy Phan, Ngoc Thang Bui, Sumin Park, Jaeyeop Choi, Junghwan Oh,

OBJECTIVE:The aim of this study was to monitor the physiological changes and cytotoxic effects of exogenous contrast agents during photoacoustic imaging (PAI) and photothermal therapy (PTT). In this paper, a low-power telemetric device for mouse vital signs monitoring was designed and demonstrated. APPROACH:The power consumption was optimized through hardware and ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Intrinsic frequency method for instantaneous assessment of left ventricular-arterial coupling after transcatheter aortic valve replacement.

Emad Mogadam, David M Shavelle, Gregory M Giesler, Christina Economides, Lidia St Pierre, Sue Duquette, Ray V Matthews, Niema M Pahlevan,

BACKGROUND:Aortic stenosis (AS) is the most common cause for valve replacement in the United States. The pathophysiology of AS involves obstruction to the left ventricular (LV) outflow and reduced arterial compliance. The intrinsic frequency (IF) method is a system-based approach for hemodynamic monitoring of the LV-arterial system and involves determination ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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COHmax: an algorithm to maximise coherence in estimates of dynamic cerebral autoregulation.

Ronney B Panerai, Kannakorn Intharakham, Jatinder Singh Minhas, Osian Llwyd, Angela S M Salinet, Emmanuel Katsogridakis, Paola Maggio, Thompson G Robinson,

OBJECTIVE:The reliability of dynamic cerebral autoregulation (dCA) parameters, obtained with transfer function analysis (TFA) of spontaneous fluctuations in arterial blood pressure (BP), require statistically significant values of the coherence function. A new algorithm (COHmax) is proposed to increase values of coherence by means of the automated, selective removal of sub-segments ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Ballistocardiography and seismocardiography detection of hemodynamic changes during simulated obstructive apnea.

Sofia Morra, Amin Hossein, Damien Gorlier, Jérémy Rabineau, Martin Chaumont, Pierre-François Migeotte, Philippe Van De Borne,

OBJECTIVE:To investigate if modern seismocardiography (SCG) and ballistocardiography (BCG) are useful in the detection of hemodynamic changes occurring during simulated obstructive apneic events. METHODS:Forty-seven healthy volunteers performed a voluntary maximum Mueller maneuver (MM) for 10 s, and SCG and BCG signals were simultaneously taken. The kinetic energy of a set ... Read more >>

Physiol Meas (Physiological measurement)
[2020, 41(6):065007]

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Respiratory activity extracted from wrist-worn reflective photoplethysmography in a sleep-disordered population.

Gabriele B Papini, Pedro Fonseca, Merel M van Gilst, Jan Wm Bergmans, Rik Vullings, Sebastiaan Overeem,

OBJECTIVE:Respiratory activity is an essential parameter to monitor healthy and disordered sleep, and unobtrusive measurement methods have important clinical applications in diagnostics of sleep-related breathing disorders. We propose a respiratory activity surrogate extracted from wrist-worn reflective photoplethysmography validated on a heterogeneous dataset of 389 sleep recordings. APPROACH:The surrogate was extracted ... Read more >>

Physiol Meas (Physiological measurement)
[2020, 41(6):065010]

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The hypertension assessment based on features extraction using PPG signal and its derivatives.

Liping Yao, Weizhang Liu,

The long-term abnormal blood pressure would lead to various cardiovascular diseases, therefore it is significant to assess the blood pressure status for prevention. In this study, the proposed feature-extraction based approach is performed on the open clinical trial dataset. Firstly, CEEMDAN algorithm and wavelet threshold analysis are applied to eliminate ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Classification of cognitive reserve in healthy older adults based on brain activity using support vector machine.

Chia-Yen Yang, Ching-Po Lin,

OBJECTIVE:Cognitive reserve (CR) refers to the capacity of the brain to actively cope with damage via the implementation of remedial cognitive processes. Traditional CR measurements focus on static proxies, which may not be able to appropriately estimate dynamic changes in CR. This study therefore investigated the cognitive performance and characteristics ... Read more >>

Physiol Meas (Physiological measurement)
[2020, 41(6):065009]

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Estimated and measured core temperature responses to high-intensity warm weather military training: implications for exertional heat illness risk assessment.

Mark J Buller, Trish Davey, Joanne L Fallowfield, Scott J Montain, Reed W Hoyt, Simon K Delves,

OBJECTIVE:Humans avoid overheating through physiological and behavioral mechanisms. However, elite athletes, industrial workers, and military personnel, driven by the tasks at hand, may choose to continue working and face an increased risk of exertional heat illness (EHI). We wanted to examine the efficacy of a new core temperature (Tcr) estimation ... Read more >>

Physiol Meas (Physiological measurement)
[2020, 41(6):065011]

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Bioelectrical impedance analysis and dual x-ray absorptiometry agreement for skeletal muscle mass index evaluation in sarcopenia diagnosis.

Clara Helena González Correa, Felipe Marulanda Mejía, Pablo Andrés Castaño González, Jose Armando Vidarte Claros, Hector David Castiblanco Arroyabe,

BACKGROUND:All definitions for diagnosing sarcopenia include the estimation of muscle mass. This can be made using bioelectrical impedance analysis (BIA) or dual x-ray absorptiometry (DXA). BIA is a portable and inexpensive method suitable for clinical settings, while DXA is cumbersome, more expensive and less available. OBJECTIVES:To evaluate the interchangeability of ... Read more >>

Physiol Meas (Physiological measurement)
[2020, 41(6):064005]

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Artifact rejection and missing data imputation in cerebral blood flow velocity signals via trace norm minimization.

Cameron Allan Gunn, Xiao Hu, Lieven Vandenberghe,

OBJECTIVE:Many physiological signals are degraded by significant corruptions that limit their usefulness. One example is cerebral blood flow velocity (CBFV) signals, measured by transcranial Doppler, which are susceptible to large errors from patient motion. In this paper we propose a method to remove artifacts and impute sections of missing data ... Read more >>

Physiol Meas (Physiological measurement)
[2020, :]

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Novel, clinically applicable method to measure step-width during the swing phase of gait.

Tomas Bäcklund, Fredrik Öhberg, Gudrun Johansson, Helena Grip, Nina Sundström,

OBJECTIVE:Step-width during walking is an indicator of stability and balance in patients with neurological disorders, and development of objective tools to measure this clinically would be a great advantage. The aim of this study was to validate an in-house-developed gait analysis system (Striton), based on optical and inertial sensors and ... Read more >>

Physiol Meas (Physiological measurement)
[2020, 41(6):065005]

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Personalized automatic sleep staging with single-night data: a pilot study with Kullback-Leibler divergence regularization.

Huy Phan, Kaare Mikkelsen, Oliver Y Chén, Philipp Koch, Alfred Mertins, Preben Kidmose, Maarten De Vos,

OBJECTIVE:Brain waves vary between people. This work aims to improve automatic sleep staging for longitudinal sleep monitoring via personalization of algorithms based on individual characteristics extracted from sleep data recorded during the first night. APPROACH:As data from a single night are very small, thereby making model training difficult, we propose ... Read more >>

Physiol Meas (Physiological measurement)
[2020, 41(6):064004]

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The effect of persistent U-shaped patterns in RR night-time series on the heart rate variability complexity in healthy humans.

Mateusz Soliński, Paweł Kuklik, Jan Gierałtowski, Rafał Baranowski, Beata Graff, Jan Żebrowski,

OBJECTIVE:U-shaped patterns, characteristic periods of time observed in tachograms, are a specific subgroup among very low frequency components characterized by relatively short periods of smooth accelerations followed by decelerations of heart rhythm. In this study, we characterize this phenomenon and its effect on heart rate variability (HRV) parameters. APPROACH:We calculated ... Read more >>

Physiol Meas (Physiological measurement)
[2020, 41(6):065001]

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Beneficial techniques for spatio-temporal imaging in electrical impedance tomography.

Alistair Boyle, Kirill Aristovich, Andy Adler,

OBJECTIVE:Electrical impedance tomography (EIT) typically reconstructs individual images from electrical voltage measurements at pairs of electrodes due to current driven through other electrode pairs on a body. EIT images have low spatial resolution, but excellent temporal resolution. There are four methods for integrating temporal data into an EIT reconstruction: filtering ... Read more >>

Physiol Meas (Physiological measurement)
[2020, 41(6):064003]

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