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Light plethysmography

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https://www.readbyqxmd.com/read/30095401/feasibility-of-structured-light-plethysmography-for-the-evaluation-of-lung-function-in-preschool-children-with-asthma
#1
Michele Ghezzi, Laura Tenero, Michele Piazza, Marco Zaffanello, Giulia Paiola, Giorgio L Piacentini
BACKGROUND: Structured light plethysmography (SLP) is a new noninvasive technology to capture the movement of the thoracic and abdominal wall, and to assess some parameters indicative for lung function. OBJECTIVE: The purpose of the study was to evaluate the feasibility of SLP in children with asthma. METHODS: A total of 52 patients were enrolled: 25 with asthma exacerbation (group 1), 13 with well-controlled asthma (group 2), and 14 healthy controls (group 3)...
July 1, 2018: Allergy and Asthma Proceedings:
https://www.readbyqxmd.com/read/29953739/the-association-between-nailfold-capillary-density-and-pulmonary-and-cardiac-involvement-in-medium-to-long-standing-juvenile-dermatomyositis
#2
Zoltan Barth, Thomas Schwartz, Berit Flatø, Trond M Aaløkken, Akos Koller, May B Lund, Ivar Sjaastad, Helga Sanner
OBJECTIVE: To explore the associations between microvascular abnormalities assessed by nailfold capillaroscopy (NFC) and pulmonary and cardiac involvement in patients with juvenile dermatomyositis (DM) assessed after medium- to long-term follow-up. METHODS: Fifty-eight juvenile DM patients were examined mean 17.0 (SD 10.6) years after symptom onset. Nailfold capillary density (NCD) and neovascular pattern (defined as scleroderma active or late pattern) were analysed blinded to clinical data...
June 28, 2018: Arthritis Care & Research
https://www.readbyqxmd.com/read/29932498/tidal-breathing-parameters-measured-by-structured-light-plethysmography-in-children-aged-2-12-years-recovering-from-acute-asthma-wheeze-compared-with-healthy-children
#3
Hamzah Hmeidi, Shayan Motamedi-Fakhr, Edward K Chadwick, Francis J Gilchrist, Warren Lenney, Richard Iles, Rachel C Wilson, John Alexander
Measurement of lung function can be difficult in young children. Structured light plethysmography (SLP) is a novel, noncontact method of measuring tidal breathing that monitors displacement of the thoraco-abdominal wall. SLP was used to compare breathing in children recovering from an acute exacerbation of asthma/wheeze and an age-matched cohort of controls. Children aged 2-12 years with acute asthma/wheeze (n = 39) underwent two 5-min SLP assessments, one before bronchodilator treatment and one after. SLP was performed once in controls (n = 54)...
June 2018: Physiological Reports
https://www.readbyqxmd.com/read/29756164/methods-for-the-determination-of-skeletal-muscle-blood-flow-development-strengths-and-limitations
#4
REVIEW
Lasse Gliemann, Stefan P Mortensen, Ylva Hellsten
Since the first measurements of limb blood flow at rest and during nerve stimulation were conducted in the late 1800s, a number of methods have been developed for the determination of limb and skeletal muscle blood flow in humans. The methods, which have been applied in the study of aspects such as blood flow regulation, oxygen uptake and metabolism, differ in terms of strengths and degree of limitations but most have advantages for specific settings. The purpose of this review is to describe the origin and the basic principles of the methods, important aspects and requirements of the procedures...
June 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29559234/body-composition-dietary-intake-and-physical-activity-of-young-survivors-of-childhood-cancer
#5
Alexia J Murphy-Alford, Melinda White, Liane Lockwood, Andrew Hallahan, Peter S W Davies
AIM: To describe the body composition, dietary intake and physical activity and of paediatric, adolescent and young adult childhood cancer survivors (CCS) and examine the factors that impact body composition after treatment. METHODS: This prospective cross-sectional study involved 74 subjects who were at least three years post treatment. Measurements included anthropometry, whole body potassium counting, air displacement plethysmography, and three day physical activity and diet diaries...
March 7, 2018: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29552419/bounded-kalman-filter-method-for-motion-robust-non-contact-heart-rate-estimation
#6
Sakthi Kumar Arul Prakash, Conrad S Tucker
The authors of this work present a real-time measurement of heart rate across different lighting conditions and motion categories. This is an advancement over existing remote Photo Plethysmography (rPPG) methods that require a static, controlled environment for heart rate detection, making them impractical for real-world scenarios wherein a patient may be in motion, or remotely connected to a healthcare provider through telehealth technologies. The algorithm aims to minimize motion artifacts such as blurring and noise due to head movements (uniform, random) by employing i) a blur identification and denoising algorithm for each frame and ii) a bounded Kalman filter technique for motion estimation and feature tracking...
February 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29163199/slow-breathing-can-be-operantly-conditioned-in-the-rat-and-may-reduce-sensitivity-to-experimental-stressors
#7
Donald J Noble, William N Goolsby, Sandra M Garraway, Karmarcha K Martin, Shawn Hochman
In humans, exercises involving slowed respiratory rate (SRR) counter autonomic sympathetic bias and reduce responses to stressors, including in individuals with various degrees of autonomic dysfunction. In the rat, we examined whether operant conditioning could lead to reductions in respiratory rate (RR) and performed preliminary studies to assess whether conditioned SRR was sufficient to decrease physiological and behavioral responsiveness to stressors. RR was continuously monitored during 20 2-h sessions using whole body plethysmography...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29057330/validation-of-a-white-light-3d-body-volume-scanner-to-assess-body-composition
#8
Jose Medina-Inojosa, Virend Somers, Sarah Jenkins, Jennifer Zundel, Lynne Johnson, Chassidy Grimes, Francisco Lopez-Jimenez
INTRODUCTION: Estimating body fat content has shown to be a better predictor of adiposity-related cardiovascular risk than the commonly used body mass index (BMI). The white-light 3D body volume index (BVI) scanner is a non-invasive device normally used in the clothing industry to assess body shapes and sizes. We assessed the hypothesis that volume obtained by BVI is comparable to the volume obtained by air displacement plethysmography (Bod-Pod) and thus capable of assessing body fat mass using the bi-compartmental principles of body composition...
2017: Obesity, Open Access
https://www.readbyqxmd.com/read/28886584/human-pulpal-blood-flow-in-different-root-formation-stages-measured-with-transmitted-light-plethysmography
#9
Khongorzul Ganbold, Satoko Kakino, Hideharu Ikeda, Michiyo Miyashin
OBJECTIVES: To determine the pulp vitality after traumatic injury, dentists often use pulp sensitivity tests, which can be ambiguous in young permanent teeth with incomplete root formation. Transmitted-light plethysmography (TLP) is a non-invasive objective method that uses a 525-nm LED to detect blood volume change in the pulp. The present study aimed (1) to investigate pulpal blood flow with TLP and optical characteristics in healthy permanent maxillary incisors in different root formation stages, and (2) to assess the influences of body growth of the children and tooth color on the TLP amplitude...
November 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28702339/structured-light-plethysmography-slp-management-and-follow-up-of-a-paediatric-patient-with-pneumonia
#10
Michele Ghezzi, Laura Tenero, Michele Piazza, Alessandro Bodini, Giorgio Piacentini
Structured Light Plethysmography (SLP) is a non-invasive method to study chest and abdominal movement during breathing and can identify abnormal contributions of the different regions of the chest. M.D hospitalized for pneumonia, underwent SLP and spirometry at admission (T0), after 48 hours (T1), and after one month (T2). SLP parameters showed expiratory flow limitation, information consistent with the spirometric parameters collected, and reduced motion in the area effected by pneumonia, with improvement and normalization at T1 and T2...
2017: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/28572773/measuring-ventilatory-activity-with-structured-light-plethysmography-slp-reduces-instrumental-observer-effect-and-preserves-tidal-breathing-variability-in-healthy-and-copd
#11
Marie-Cécile Niérat, Bruno-Pierre Dubé, Claudia Llontop, Agnès Bellocq, Lila Layachi Ben Mohamed, Isabelle Rivals, Christian Straus, Thomas Similowski, Pierantonio Laveneziana
The use of a mouthpiece to measure ventilatory flow with a pneumotachograph (PNT) introduces a major perturbation to breathing ("instrumental/observer effect") and suffices to modify the respiratory behavior. Structured light plethysmography (SLP) is a non-contact method of assessment of breathing pattern during tidal breathing. Firstly, we validated the SLP measurements by comparing timing components of the ventilatory pattern obtained by SLP vs. PNT under the same condition; secondly, we compared SLP to SLP+PNT measurements of breathing pattern to evaluate the disruption of breathing pattern and breathing variability in healthy and COPD subjects...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28538260/longitudinal-physical-activity-body-composition-and-physical-fitness-in-preschoolers
#12
Marja H Leppänen, Pontus Henriksson, Christine Delisle Nyström, Hanna Henriksson, Francisco B Ortega, Jeremy Pomeroy, Jonatan R Ruiz, Cristina Cadenas-Sanchez, Marie Löf
PURPOSE: This study aimed to investigate longitudinal associations of objectively measured physical activity (PA) and sedentary behavior (SB) with body composition and physical fitness at a 12-month follow-up in healthy Swedish 4-yr-old children. METHODS: The data from the population-based MINISTOP trial were collected between 2014 and 2016, and this study included the 138 children who were in the control group. PA and SB were assessed using the wrist-worn ActiGraph (wGT3x-BT) accelerometer during seven 24-h periods and, subsequently, defined as SB, light-intensity PA, moderate-intensity PA, vigorous-intensity PA (VPA), and moderate-to-vigorous PA (MVPA)...
October 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28495855/marijuana-smoke-induces-severe-pulmonary-hyperresponsiveness-inflammation-and-emphysema-in-a-predictive-mouse-model-not-via-cb1-receptor-activation
#13
Z Helyes, Á Kemény, K Csekő, É Szőke, K Elekes, M Mester, K Sándor, A Perkecz, L Kereskai, L Márk, Á Bona, A Benkő, E Pintér, J Szolcsányi, C Ledent, B Sperlágh, T F Molnár
Sporadic clinical reports suggested that marijuana smoking induces spontaneous pneumothorax, but no animal models were available to validate these observations and to study the underlying mechanisms. Therefore, we performed a systematic study in CD1 mice as a predictive animal model and assessed the pathophysiological alterations in response to 4-mo-long whole body marijuana smoke with integrative methodologies in comparison with tobacco smoke. Bronchial responsiveness was measured with unrestrained whole body plethysmography, cell profile in the bronchoalveolar lavage fluid with flow cytometry, myeloperoxidase activity with spectrophotometry, inflammatory cytokines with ELISA, and histopathological alterations with light microscopy...
August 1, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28352083/novel-contactless-approach-for-assessment-of-venous-occlusion-plethysmography-by-video-recordings-at-the-green-illumination
#14
Alexei A Kamshilin, Valeriy V Zaytsev, Oleg V Mamontov
Occlusion plethysmography is an important method for assessment of the status of the cardiovascular system, which provides valuable information concerning arterial and venous blood flow, including mechanisms of their regulation. All up-to-date systems estimate change of the limb's volume during occlusion by contact-type sensors. The objective of the research is demonstration of feasibility of the novel approach to measuring the blood flow during venous occlusion by using imaging photoplethysmography (PPG). Twenty healthy individuals participated in the experiment...
March 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28275111/tidal-breathing-parameters-measured-using-structured-light-plethysmography-in-healthy-children-and-those-with-asthma-before-and-after-bronchodilator
#15
Hamzah Hmeidi, Shayan Motamedi-Fakhr, Edward Chadwick, Francis J Gilchrist, Warren Lenney, Richard Iles, Rachel C Wilson, John Alexander
Structured light plethysmography (SLP) is a light-based, noncontact technique that measures tidal breathing by monitoring displacements of the thoracoabdominal (TA) wall. We used SLP to measure tidal breathing parameters and their within-subject variability (v) in 30 children aged 7-16 years with asthma and abnormal spirometry (forced expiratory volume in 1 sec [FEV1] <80% predicted) during a routine clinic appointment. As part of standard care, the reversibility of airway obstruction was assessed by repeating spirometry after administration of an inhaled bronchodilator...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28230307/cdkl5-deficiency-entails-sleep-apneas-in-mice
#16
Viviana Lo Martire, Sara Alvente, Stefano Bastianini, Chiara Berteotti, Alessandro Silvani, Alice Valli, Rocchina Viggiano, Elisabetta Ciani, Giovanna Zoccoli
A recently discovered neurodevelopmental disorder caused by the mutation of the cyclin-dependent kinase-like 5 gene (CDKL5) entails complex autistic-like behaviours similar to Rett syndrome, but its impact upon physiological functions remains largely unexplored. Sleep-disordered breathing is common and potentially life-threatening in patients with Rett syndrome; however, evidence is limited in children with CDKL5 disorder, and is lacking altogether in adults. The aim of this study was to test whether the breathing pattern during sleep differs between adult Cdkl5 knockout (Cdkl5-KO) and wild-type (WT) mice...
August 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28193785/evaluation-of-the-agreement-of-tidal-breathing-parameters-measured-simultaneously-using-pneumotachography-and-structured-light-plethysmography
#17
Shayan Motamedi-Fakhr, Richard Iles, Anna Barney, Willem de Boer, Jenny Conlon, Amna Khalid, Rachel C Wilson
Structured light plethysmography (SLP) is a noncontact, noninvasive, respiratory measurement technique, which uses a structured pattern of light and two cameras to track displacement of the thoraco-abdominal wall during tidal breathing. The primary objective of this study was to examine agreement between tidal breathing parameters measured simultaneously for 45 sec using pneumotachography and SLP in a group of 20 participants with a range of respiratory patterns ("primary cohort"). To examine repeatability of the agreement, an additional 21 healthy subjects ("repeatability cohort") were measured twice during resting breathing and once during increased respiratory rate (RR)...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28096696/tidal-breathing-patterns-derived-from-structured-light-plethysmography-in-copd-patients-compared-with-healthy-subjects
#18
Shayan Motamedi-Fakhr, Rachel C Wilson, Richard Iles
PURPOSE: Differences in tidal breathing patterns have been reported between patients with chronic obstructive pulmonary disease (COPD) and healthy individuals using traditional measurement techniques. This feasibility study examined whether structured light plethysmography (SLP) - a noncontact, light-based technique - could also detect differences in tidal breathing patterns between patients with COPD and healthy subjects. PATIENTS AND METHODS: A 5 min period of tidal (quiet) breathing was recorded in each patient with COPD (n=31) and each healthy subject (n=31), matched for age, body mass index, and sex...
2017: Medical Devices: Evidence and Research
https://www.readbyqxmd.com/read/27899542/pulse-oximetry-beyond-spo2
#19
Dean R Hess
Newer pulse oximetry technology is available that uses multiple wavelengths of light and is thereby able to measure more than 2 forms of hemoglobin, including carboxyhemoglobin (SpCO), methemoglobin (SpMet), and total hemoglobin (SpHb). Several studies have shown relatively low bias, but poor precision, for SpCO compared with HbCO. Evaluations of SpMet have been conducted primarily in normal subjects. Clinical evaluations of SpHb suggest that it might not yet be accurate enough to make transfusion decisions...
December 2016: Respiratory Care
https://www.readbyqxmd.com/read/27824061/length-free-near-infrared-measurement-of-newborn-malnutrition
#20
Fatin Hamimi Mustafa, Emily J Bek, Jacqueline Huvanandana, Peter W Jones, Angela E Carberry, Heather E Jeffery, Craig T Jin, Alistair L McEwan
Under-nutrition in neonates can cause immediate mortality, impaired cognitive development and early onset adult disease. Body fat percentage measured using air-displacement-plethysmography has been found to better indicate under-nutrition than conventional birth weight percentiles. However, air-displacement-plethysmography equipment is expensive and non-portable, so is not suited for use in developing communities where the burden is often the greatest. We proposed a new body fat measurement technique using a length-free model with near-infrared spectroscopy measurements on a single site of the body - the thigh...
November 8, 2016: Scientific Reports
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