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https://www.readbyqxmd.com/read/28919258/examining-the-time-course-of-genital-and-subjective-sexual-responses-in-women-and-men-with-concurrent-plethysmography-and-thermography
#1
Jackie S Huberman, Samantha J Dawson, Meredith L Chivers
Sexual response is a dynamic process, though there is limited knowledge of the time course and relationships among its psychological and physiological components. To address this gap, we concurrently assessed self-reported sexual arousal, genital temperature (with thermography), and genital vasocongestion (with vaginal photoplethysmography [VPP] or penile plethysmography [PPG]) during sexual and nonsexual films in 28 androphilic women (attracted to men) and 27 gynephilic men (attracted to women). Men and women had similarly strong agreement between subjective and genital responses (sexual concordance) with thermography, but this agreement was stronger in men than women with PPG/VPP...
September 14, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28918214/efficient-noise-tolerant-estimation-of-heart-rate-variability-using-single-channel-photoplethysmography
#2
Reza Firoozabadi, Eric D Helfenbein, Saeed Babaeizadeh
BACKGROUND: The feasibility of using photoplethysmography (PPG) for estimating heart rate variability (HRV) has been the subject of many recent studies with contradicting results. Accurate measurement of cardiac cycles is more challenging in PPG than ECG due to its inherent characteristics. METHODS: We developed a PPG-only algorithm by computing a robust set of medians of the interbeat intervals between adjacent peaks, upslopes, and troughs. Abnormal intervals are detected and excluded by applying our criteria...
August 18, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28912525/pulse-transit-time-based-continuous-cuffless-blood-pressure-estimation-a-new-extension-and-a-comprehensive-evaluation
#3
Xiaorong Ding, Bryan P Yan, Yuan-Ting Zhang, Jing Liu, Ni Zhao, Hon Ki Tsang
Cuffless technique enables continuous blood pressure (BP) measurement in an unobtrusive manner, and thus has the potential to revolutionize the conventional cuff-based approaches. This study extends the pulse transit time (PTT) based cuffless BP measurement method by introducing a new indicator - the photoplethysmogram (PPG) intensity ratio (PIR). The performance of the models with PTT and PIR was comprehensively evaluated in comparison with six models that are based on sole PTT. The validation conducted on 33 subjects with and without hypertension, at rest and under various maneuvers with induced BP changes, and over an extended calibration interval, respectively...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28895317/assessment-of-a-noninvasive-optical-photoplethysmography-imaging-device-with-dynamic-tissue-phantom-models
#4
C Ikenna Nwafor, Kevin D Plant, Darlene R King, Brian P McCall, John J Squiers, Wensheng Fan, J Michael DiMaio, Jeffrey E Thatcher
Noncontact photoplethysmography (PPG) has been studied as a method to provide low-cost, noninvasive, two-dimensional blood oxygenation measurements and medical imaging for a variety of near-surface pathologies. To evaluate this technology in a laboratory setting, dynamic tissue phantoms were developed with tunable parameters that mimic physiologic properties of the skin, including blood vessel volume change, pulse wave frequency, and tissue scattering and absorption. Tissue phantoms were generated using an elastic tubing to represent a blood vessel where the luminal volume could be modulated with a pulsatile fluid flow...
September 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28894359/analysis-of-the-dynamics-of-venous-blood-flow-in-the-context-of-lower-limb-temperature-distribution-and-tissue-composition-in-the-elderly
#5
Aleksandra Skomudek, Iwona Gilowska, Ryszard Jasiński, Krystyna Rożek-Piechura
OBJECTIVE: The elderly are particularly vulnerable to degenerative diseases, such as circulatory and respiratory system and vascular system diseases. The objective of this study was therefore to evaluate the distribution of temperature and the dynamics of venous blood flow in the lower limbs (LLs) and to assess the interdependence of these parameters in terms of the somatic components in males and females participating in activities at the University of the Third Age. MATERIALS AND METHODS: The study included 60 females (mean age 67...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/28883882/effects-of-combined-far-infrared-radiation-and-acupuncture-at-st36-on-peripheral-blood-perfusion-and-autonomic-activities
#6
Cheng-Chan Yang, Gen-Min Lin, Jen-Hung Wang, Hsiao-Chiang Chu, Hsien-Tsai Wu, Jian-Jung Chen, Cheuk-Kwan Sun
Using four-channel photoplethysmography (PPG) for acquiring peripheral arterial waveforms, this study investigated vascular and autonomic impacts of combined acupuncture-far infrared radiation (FIR) in improving peripheral circulation. Twenty healthy young adults aged 25.5 ± 4.6 were enrolled for 30-minute measurement. Each subject underwent four treatment strategies, including acupuncture at ST36 (Zusanli), pseudoacupuncture, FIR, and combined acupuncture-FIR at different time points. Response was assessed at 5-minute intervals...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28875766/postprandial-glucose-and-healthcare-resource-use-a-cross-sectional-survey-of-adults-with-diabetes-treated-with-basal-bolus-insulin
#7
Kathryn M Pfeiffer, Anna Sandberg, Annie Nikolajsen, Meryl Brod
AIMS: Postprandial glucose (PPG) control is a well-known challenge for diabetes management, yet there is limited research on how PPG affects healthcare resource utilization. This study investigated the association between PPG levels and healthcare resource utilization among adults with diabetes treated with basal-bolus insulin. METHODS: A web-based, cross-sectional survey (n = 940) of adults with type 1 or type 2 diabetes and treated with basal and bolus insulins was conducted in Italy, the United Kingdom, and the United States...
September 6, 2017: Journal of Medical Economics
https://www.readbyqxmd.com/read/28865347/time-varying-assessment-of-heart-rate-variability-parameters-using-respiratory-information
#8
Layli S Goldoozian, Edmond Zahedi, Vicente Zarzoso
Analysis of heart rate variability (HRV) is commonly used for characterization of autonomic nervous system. As high frequency (HF, known as the respiratory-related) component of HR, overlaps with the typical low frequency (LF) band when the respiratory rate is low, a reference signal for HF variations would help in better discriminating the LF and HF components of HR. The present study proposes a model for time-varying separation of HRV components as well as estimation of HRV parameters using respiration information...
August 1, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28859176/comparison-of-peripapillary-vessel-density-between-preperimetric-and-perimetric-glaucoma-evaluated-by-oct-angiography
#9
Si Bum Kim, Eun Jung Lee, Jong Chul Han, Changwon Kee
PURPOSE: To determine peripapillary vessel density in eyes with perimetric glaucoma (PG) or preperimetric glaucoma (PPG) compared to normal controls using optical coherence tomography-angiography (OCT-A). METHODS: We recruited 13 patients with unilateral perimetric normal-tension glaucoma (NTG) and fellow preperimetric NTG showing only inferotemporal retinal nerve fiber layer (RNFL) defect in red-free RNFL photography in both eyes. We also enrolled 9 healthy controls...
2017: PloS One
https://www.readbyqxmd.com/read/28856045/in-silico-and-in-vitro-investigation-of-a-photonic-monitor-for-intestinal-perfusion-and-oxygenation
#10
Mitchell B Robinson, Ryan J Butcher, Mark A Wilson, M Nance Ericson, Gerard L Coté
The quantification of visceral organ oxygenation after trauma-related systemic hypovolemia and shock is critical to enable effective resuscitation. In this work, a photoplethysmography-based (PPG) sensor was specifically designed for probing the perfusion and oxygenation condition of intestinal tissue with the ultimate goal to monitor patients post trauma to guide resuscitation. Through Monte Carlo modeling, suitable optofluidic phantoms were determined, the wavelength and separation distance for the sensor was optimized, and sensor performance for the quantification of tissue perfusion and oxygenation was tested on the in-vitro phantom...
August 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28846720/the-association-of-long-term-glycaemic-variability-versus-sustained-chronic-hyperglycaemia-with-heart-rate-corrected-qt-interval-in-patients-with-type-2-diabetes
#11
Jian-Bin Su, Xiao-Hua Yang, Xiu-Lin Zhang, Hong-Li Cai, Hai-Yan Huang, Li-Hua Zhao, Feng Xu, Tong Chen, Xing-Bo Cheng, Xue-Qin Wang, Yan Lu
OBJECTIVES: Prolonged heart rate-corrected QT(QTc) interval is related to ventricular arrhythmia and cardiovascular mortality, with considerably high prevalence of type 2 diabetes. Additionally, long-term glycaemic variability could be a significant risk factor for diabetic complications in addition to chronic hyperglycaemia. We compared the associations of long-term glycaemic variability versus sustained chronic hyperglycaemia with the QTc interval among type 2 diabetes patients. METHODS: In this cross-sectional study, 2904 type 2 diabetes patients were recruited who had undergone at least four fasting plasma glucose (FPG) and 2-hour postprandial plasma glucose (PPG) measurements (at least once for every 3 months, respectively) during the preceding year...
2017: PloS One
https://www.readbyqxmd.com/read/28844327/pacific-proving-grounds-radioisotope-imprint-in-the-philippine-sea-sediments
#12
Daniela Pittauer, Per Roos, Jixin Qiao, Walter Geibert, Marcus Elvert, Helmut W Fischer
Radionuclide concentrations were studied in sediment cores taken at the continental slope of the Philippine Sea off Mindanao Island in the equatorial Western Pacific. High resolution deposition records of anthropogenic radionuclides were collected at this site. Excess (210)Pb together with excess (228)Th and anthropogenic radionuclides provided information about accumulation rates. Concentrations of Am and Pu isotopes were detected by gamma spectrometry, alpha spectrometry and ICP-MS. The Pu ratios indicate a high portion (minimum of 60%) of Pu from the Pacific Proving Grounds (PPG)...
August 23, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28842392/clinical-validation-of-heart-rate-apps-mixed-methods-evaluation-study
#13
Thijs Vandenberk, Jelle Stans, Gertjan Van Schelvergem, Caroline Pelckmans, Christophe Jp Smeets, Dorien Lanssens, Hélène De Cannière, Valerie Storms, Inge M Thijs, Pieter M Vandervoort
BACKGROUND: Photoplethysmography (PPG) is a proven way to measure heart rate (HR). This technology is already available in smartphones, which allows measuring HR only by using the smartphone. Given the widespread availability of smartphones, this creates a scalable way to enable mobile HR monitoring. An essential precondition is that these technologies are as reliable and accurate as the current clinical (gold) standards. At this moment, there is no consensus on a gold standard method for the validation of HR apps...
August 25, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28838130/validation-of-photoplethysmography-based-sleep-staging-compared-with-polysomnography-in-healthy-middle-aged-adults
#14
Pedro Fonseca, Tim Weysen, Maaike S Goelema, Els I S Møst, Mustafa Radha, Charlotte Lunsingh Scheurleer, Leonie van den Heuvel, Ronald M Aarts
Study Objectives: To compare the accuracy of automatic sleep staging based on heart rate variability measured from photoplethysmography (PPG) combined with body movements measured with an accelerometer, with polysomnography (PSG) and actigraphy. Methods: Using wrist-worn PPG to analyze heart rate variability and an accelerometer to measure body movements, sleep stages and sleep statistics were automatically computed from overnight recordings. Sleep-wake, 4-class (wake/N1 + N2/N3/REM) and 3-class (wake/NREM/REM) classifiers were trained on 135 simultaneously recorded PSG and PPG recordings of 101 healthy participants and validated on 80 recordings of 51 healthy middle-aged adults...
July 1, 2017: Sleep
https://www.readbyqxmd.com/read/28832100/consensus-on-use-of-insulins-in-gestational-diabetes
#15
Kalyan Kumar Gangopadhyay, J J Mukherjee, R K Sahay
INTRODUCTION: Gestational Diabetes Mellitus (GDM), diabetes diagnosed during pregnancy is associated with maternal (caesarean delivery, hypoglycaemia, hyperbilirubinaemia, shoulder dystocia, pre-term delivery and birth trauma) and fetal (Hyperbilirubinaemia in offspring, Neonatal hypoglycaemia, Macrosomia) complications. Despite, insulin being the standard treatment for GDM cases, there is no existing comprehensive consensus update on use of insulin in Indian patients with GDM. OBJECTIVE: To provide simple and easily implementable guidelines to healthcare physicians on use of insulin in GDM...
March 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/28822297/validation-of-the-choking-risk-assessment-and-pneumonia-risk-assessment-for-adults-with-intellectual-and-developmental-disability-idd
#16
Justine Joan Sheppard, Georgia A Malandraki, Paula Pifer, Jill Cuff, Michelle Troche, Bronwyn Hemsley, Susan Balandin, Avinash Mishra, Roberta Hochman
BACKGROUND: Risk assessments are needed to identify adults with intellectual and developmental disability (IDD) at high risk of choking and pneumonia. AIM: To describe the development and validation of the Choking Risk Assessment (CRA) and the Pneumonia Risk Assessment (PRA) for adults with IDD. METHODS: Test items were identified through literature review and focus groups. Five-year retrospective chart reviews identified a positive choking group (PCG), a negative choking group (NCG), a positive pneumonia group (PPG), and a negative pneumonia group (NPG)...
August 16, 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/28806084/photochemical-activation-of-tertiary-amines-for-applications-in-studying-cell-physiology
#17
Naeem Asad, Davide Deodato, Xin Lan, Magnus B Widegren, David Lee Phillips, Lili Du, Timothy M Dore
Representative tertiary amines were linked to the 8-cyano-7-hydroxyquinolinyl (CyHQ) photoremovable protecting group (PPG) to create photoactivatable forms suitable for use in studying cell physiology. The photoactivation of tamoxifen and 4-hydroxytamoxifen, which can be used to activate Cre recombinase and CRISPR-Cas9 gene editing, demonstrated that highly efficient release of bioactive molecules could be achieved through one- and two-photon excitation (1PE and 2PE). CyHQ-protected anilines underwent a photoaza-Claisen rearrangement instead of releasing amines...
August 29, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28805751/characterization-of-quadratic-nonlinearity-between-motion-artifact-and-acceleration-data-and-its-application-to-heartbeat-rate-estimation
#18
Sunho Kim, Sungbin Im, Taehyung Park
Accelerometers are applied to various applications to collect information about movements of other sensors deployed at diverse fields ranging from underwater area to human body. In this study, we try to characterize the nonlinear relationship between motion artifact and acceleration data. The cross bicoherence test and the Volterra filter are used as the approaches to detection and modeling. We use the cross bicoherence test to directly detect in the frequency domain and we indirectly identify the nonlinear relationship by improving the performance of eliminating motion artifact in heartbeat rate estimation using a nonlinear filter, the second-order Volterra filter...
August 14, 2017: Sensors
https://www.readbyqxmd.com/read/28803197/sources-and-accumulation-of-plutonium-in-a-large-western-pacific-marginal-sea-the-south-china-sea
#19
Junwen Wu, Minhan Dai, Yi Xu, Jian Zheng
In order to examine the sources of plutonium (Pu) and elaborate its scavenging and accumulation processes, (240)Pu/(239)Pu atom ratios and (239+240)Pu activities in the water column of the South China Sea (SCS) were determined and compared with our previously reported data for the sediments. Consistently high (240)Pu/(239)Pu atom ratios that ranged from 0.184-0.250 (average=0.228±0.015), indicative of non-global fallout Pu sources were observed both in the surface water and at depth during 2012-2014. The spatial distribution of the (240)Pu/(239)Pu atom ratio in the SCS showed a decreasing trend away from the Luzon Strait, which was very consistent with the introduction pathway of the Kuroshio Current...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28792171/glycemic-pentad
#20
Glycemic Pentad Forum
BACKGROUND: Conventionally, diabetes management involved targeting the triad of FPG, PPG, and HbA1c. However, several studies have suggested the quintessential need for a paradigm shift to incorporate glycemic variability and quality of life in the holistic diabetes control regimen. AIM: To generate a consensus and ratify the position of Glycemic Variability (GV) and Quality of Life (QOL), along with the traditional triad, in diabetes management in India. To evaluate whether the triple fixed dose combination of metformin, glimepiride, and voglibose can accomplish the goals of glycemic pentad...
July 2017: Journal of the Association of Physicians of India
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