keyword
MENU ▼
Read by QxMD icon Read
search

Respiratory exchange ratio

keyword
https://www.readbyqxmd.com/read/29043499/open-circuit-respirometry-a-historical-review-of-portable-gas-analysis-systems
#1
REVIEW
Duncan J Macfarlane
Scientists such as physiologists, engineers, and nutritionists have often sought to estimate human metabolic strain during daily activities and physical pursuits. The measurement of human metabolism can involve direct calorimetry as well as indirect calorimetry using both closed-circuit respirometry and open-circuit methods that can include diluted flow chambers and laboratory-based gas analysis systems. For field studies, methods involving questionnaires, pedometry, accelerometery, heart rate telemetry, and doubly labelled water exist, yet portable metabolic gas analysis remains the gold standard for most field studies on energy expenditure...
October 17, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29038746/influence-of-exercise-duration-on-cardiorespiratory-responses-energy-cost-and-tissue-oxygenation-within-a-6-hour-treadmill-run
#2
Hugo A Kerhervé, Scott McLean, Karen Birkenhead, David Parr, Colin Solomon
PURPOSE: The physiological mechanisms for alterations in oxygen utilization ([Formula: see text]) and the energy cost of running (Cr ) during prolonged running are not completely understood, and could be linked with alterations in muscle and cerebral tissue oxygenation. METHODS: Eight trained ultramarathon runners (three women; mean ± SD; age 37 ± 7 yr; maximum [Formula: see text] 60 ± 15 mL min(-1) kg(-1)) completed a 6 hr treadmill run (6TR), which consisted of four modules, including periods of moderate (3 min at 10 km h(-1), 10-CR) and heavy exercise intensities (6 min at 70% of maximum [Formula: see text], HILL), separated by three, 100 min periods of self-paced running (SP)...
2017: PeerJ
https://www.readbyqxmd.com/read/29030751/effects-of-regional-perfusion-block-in-healthy-and-injured-lungs
#3
Barbara Cambiaghi, Francesco Vasques, Onnen Mörer, Christian Ritter, Tommaso Mauri, Nils Kunze-Szikszay, Karin Holke, Francesca Collino, Giorgia Maiolo, Francesca Rapetti, Elias Schulze-Kalthoff, Tommaso Tonetti, Günter Hahn, Michael Quintel, Luciano Gattinoni
BACKGROUND: Severe hypoperfusion can cause lung damage. We studied the effects of regional perfusion block in normal lungs and in the lungs that had been conditioned by lavage with 500 ml saline and high V T (20 ml kg(-1)) ventilation. METHODS: Nineteen pigs (61.2 ± 2.5 kg) were randomized to five groups: controls (n = 3), the right lower lobe block alone (n = 3), lavage and high V T (n = 4), lung lavage, and high V T plus perfusion block of the right (n = 5) or left (n = 4) lower lobe...
October 13, 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28978546/subcutaneous-inguinal-white-adipose-tissue-is-responsive-to-but-dispensable-for-the-metabolic-health-benefits-of-exercise
#4
Willem T Peppler, Logan K Townsend, Carly M Knuth, Michelle T Foster, David C Wright
Exercise training has robust effects on subcutaneous inguinal white adipose tissue (iWAT), characterized by a shift to a brown adipose tissue (BAT) like phenotype. Consistent with this, transplantation of exercise-trained iWAT into sedentary rodents activates thermogenesis and improves glucose homeostasis, suggesting that iWAT metabolism may contribute to the beneficial effects of exercise. However, it is yet to be determined if adaptations in iWAT are necessary for the beneficial systemic effects of exercise...
October 3, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28969229/surfactant-therapy-for-early-onset-pneumonia-in-late-preterm-and-term-neonates-needing-mechanical-ventilation
#5
Sujata Deshpande, Pradeep Suryawanshi, Kunal Ahya, Rajesh Maheshwari, Samir Gupta
INTRODUCTION: Pathophysiology of pneumonia involves leakage of plasma proteins into the airways and accumulation of cytokines within the lung. Several in vitro and in vivo studies have demonstrated that this proteinaceous material and lung inflammation inhibit surfactant function. AIM: To evaluate whether exogenous surfactant therapy improves oxygenation and gas exchange in late preterm and term neonates with early onset pneumonia and respiratory failure. MATERIALS AND METHODS: This prospective interventional cohort study was conducted at a tertiary care neonatal unit...
August 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28968061/comparative-in-vivo-investigation-of-intrathecal-and-intracerebroventricular-administration-with-melanocortin-ligands-mtii-and-agrp-into-mice
#6
Danielle N Adank, Mary M Lunzer, Cody J Lensing, Stacey L Wilber, Amy M Gancarz, Carrie Haskell-Luevano
Central administration of melanocortin ligands has been used as a critical technique to study energy homeostasis. While intracerebroventricular (ICV) injection is the most commonly used method during these investigations, intrathecal (IT) injection can be equally efficacious for the central delivery of ligands. Importantly, intrathecal administration can optimize exploration of melanocortin receptors in the spinal cord. Herein, we investigate comparative IT and ICV administration of two melanocortin ligands, the synthetic MTII (Ac-Nle-c[Asp-His-DPhe-Arg-Trp-Lys]-NH2) MC4R agonist and agouti-related peptide [AGRP(87-132)] MC4R inverse agonist/antagonist, on the same batch of age-matched mice in TSE metabolic cages undergoing a nocturnal satiated paradigm...
October 2, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28961282/physiologic-effects-of-alveolar-recruitment-and-inspiratory-pauses-during-moderately-high-frequency-ventilation-delivered-by-a-conventional-ventilator-in-a-severe-lung-injury-model
#7
Ricardo Luiz Cordioli, Eduardo Leite Vieira Costa, Luciano Cesar Pontes Azevedo, Susimeire Gomes, Marcelo Britto Passos Amato, Marcelo Park
BACKGROUND AND AIMS: To investigate whether performing alveolar recruitment or adding inspiratory pauses could promote physiologic benefits (VT) during moderately-high-frequency positive pressure ventilation (MHFPPV) delivered by a conventional ventilator in a porcine model of severe acute respiratory distress syndrome (ARDS). METHODS: Prospective experimental laboratory study with eight pigs. Induction of acute lung injury with sequential pulmonary lavages and injurious ventilation was initially performed...
2017: PloS One
https://www.readbyqxmd.com/read/28941533/pathophysiology-and-management-of-acute-respiratory-distress-syndrome-in-children
#8
REVIEW
Sabrina M Heidemann, Alison Nair, Yonca Bulut, Anil Sapru
Acute respiratory distress syndrome (ARDS) is a syndrome of noncardiogenic pulmonary edema and hypoxia that accompanies up to 30% of deaths in pediatric intensive care units. Pediatric ARDS (PARDS) is diagnosed by the presence of hypoxia, defined by oxygenation index or Pao2/Fio2 ratio cutoffs, and new chest infiltrate occurring within 7 days of a known insult. Hallmarks of ARDS include hypoxemia and decreased lung compliance, increased work of breathing, and impaired gas exchange. Mortality is often accompanied by multiple organ failure...
October 2017: Pediatric Clinics of North America
https://www.readbyqxmd.com/read/28932743/exercise-affects-cardiopulmonary-function-in-patients-with-chronic-kidney-disease-a-meta-analysis
#9
REVIEW
Hongchang Yang, Xueping Wu, Min Wang
This study aimed to comprehensively assess the effects of exercise on cardiopulmonary function indices in patients with chronic kidney disease (CKD). A literature review was performed by searching literatures in PubMed and Embase before June 2016. Studies were selected based on predefined inclusion and exclusion criteria, followed by data extraction and a quality assessment of the included studies using the Cochrane Collaboration's tool. Correlations between exercise and cardiopulmonary function indices [pulse wave velocity, respiratory exchange ratio, and peak oxygen uptake (VO2 peak)] were then evaluated using mean differences and 95% confidence intervals...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28919843/the-effects-of-phenylalanine-on-exercise-induced-fat-oxidation-a-preliminary-double-blind-placebo-controlled-crossover-trial
#10
Keisuke Ueda, Chiaki Sanbongi, Makoto Yamaguchi, Shuji Ikegami, Takafumi Hamaoka, Satoshi Fujita
BACKGROUND: When combined with exercise, dietary amino acid (AA) supplementation is an effective method for accelerating fat mobilization. However, the effects of single AAs combined with exercise on fat oxidation remains unclear. We hypothesized that consumption of a specific amino acid, L- phenylalanine, may result in the secretion of glucagon, and when combined with exercise may promote fat oxidation. METHODS: Six healthy, active male volunteers were randomized in a crossover study to ingest either phenylalanine (3 g/dose) or placebo...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28905374/heat-and-moisture-exchangers-versus-heated-humidifiers-for-mechanically-ventilated-adults-and-children
#11
REVIEW
Donna Gillies, David A Todd, Jann P Foster, Bisanth T Batuwitage
BACKGROUND: Invasive ventilation is used to assist or replace breathing when a person is unable to breathe adequately on their own. Because the upper airway is bypassed during mechanical ventilation, the respiratory system is no longer able to warm and moisten inhaled gases, potentially causing additional breathing problems in people who already require assisted breathing. To prevent these problems, gases are artificially warmed and humidified. There are two main forms of humidification, heat and moisture exchangers (HME) or heated humidifiers (HH)...
September 14, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28903627/reliability-and-minimal-detectable-change-of-a-new-treadmill-based-progressive-workload-incremental-test-to-measure-cardiorespiratory-fitness-in-manual-wheelchair-users
#12
Cindy Gauthier, Jasmine Arel, Rachel Brosseau, Audrey L Hicks, Dany H Gagnon
Background Cardiorespiratory fitness training is commonly provided to manual wheelchair users (MWUs) in rehabilitation and physical activity programs, emphasizing the need for a reliable task-specific incremental wheelchair propulsion test. Objective Quantifying test-retest reliability and minimal detectable change (MDC) of key cardiorespiratory fitness measures following performance of a newly developed continuous treadmill-based wheelchair propulsion test (WPTTreadmill). Methods Twenty-five MWUs completed the WPTTreadmill on two separate occasions within one week...
September 13, 2017: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/28892419/the-effect-of-a-backpack-hip-strap-on-energy-expenditure-while-walking
#13
Jamie Pigman, William Sullivan, Steven Leigh, Peter A Hosick
Objective To examine the effect of backpack hip strap use on walking energy expenditure while carrying a loaded backpack. Background Previous studies have demonstrated that energy cost increases as the mass of the load carried increases. However, few investigations have focused on backpack carriage design. Methods Fifteen young, healthy, male subjects walked at a self-selected pace for 10 minutes in two backpack loading conditions: with a hip strap (strapped) and without a hip strap (nonstrapped). Oxygen consumption (VO2), rating of perceived exertion (RPE), respiratory exchange ratio (RER), and heart rate (HR) were monitored throughout each 10-minute trial...
September 1, 2017: Human Factors
https://www.readbyqxmd.com/read/28872376/caffeine-and-physiological-responses-to-submaximal-exercise-a-meta-analysis
#14
Mark Glaister, Conor Gissane
The aim of this study was to carry out a systematic review and meta-analysis of the effects of caffeine supplementation on physiological responses to submaximal exercise. 26 studies met the inclusion criteria of adopting double-blind, randomised, crossover designs that included a sustained (5 - 30 minutes) fixed-intensity bout of submaximal exercise (constrained to 60 - 85% V̇O2max) using a standard caffeine dose of 3 - 6 mg∙kg(-1) administered 30 - 90 minutes prior to exercise. Meta-analyses were completed using a random-effects model, and data are presented as raw mean difference (D) with associated 95% confidence limits (CL95)...
September 5, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28871533/multisense-a-multimodal-sensor-tool-enabling-the-high-throughput-analysis-of-respiration
#15
Peter Keil, Gregor Liebsch, Ljudmilla Borisjuk, Hardy Rolletschek
The high-throughput analysis of respiratory activity has become an important component of many biological investigations. Here, a technological platform, denoted the "MultiSense tool," is described. The tool enables the parallel monitoring of respiration in 100 samples over an extended time period, by dynamically tracking the concentrations of oxygen (O2) and/or carbon dioxide (CO2) and/or pH within an airtight vial. Its flexible design supports the quantification of respiration based on either oxygen consumption or carbon dioxide release, thereby allowing for the determination of the physiologically significant respiratory quotient (the ratio between the quantities of CO2 released and the O2 consumed)...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28846671/effects-of-postnatal-overfeeding-and-fish-oil-diet-on-energy-expenditure-in-rats
#16
Yanyan Dai, Nan Zhou, Fan Yang, Shanshan Zhou, Lijun Sha, Jianping Wang, Xiaonan Li
BACKGROUD: Early life nutrition may have a role in the regulation of metabolism in adulthood. The present study aimed to evaluate the effects of postnatal overfeeding and a postweaning fish oil diet on energy expenditure. METHODS: On postnatal day 3, rat litters were adjusted to a litter size of three (small litters, SLs) or ten (normal litters, NLs). After weaning, SLs were fed the standard diet or a fish oil diet enriched with polyunsaturated fatty acids (SL-FOs) for 10 weeks...
August 28, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28843448/cardiorespiratory-fitness-and-future-risk-of-pneumonia-a-long-term-prospective-cohort-study
#17
Setor K Kunutsor, Tanjaniina Laukkanen, Jari A Laukkanen
PURPOSE: We aimed to assess the prospective association of cardiorespiratory fitness (CRF) with the risk of pneumonia. METHODS: Cardiorespiratory fitness, as measured by maximal oxygen uptake, was assessed using a respiratory gas exchange analyzer in 2244 middle-aged men in the Kuopio Ischemic Heart Disease cohort. We corrected for within-person variability in CRF levels using data from repeat measurements taken several years apart. RESULTS: During a median follow-up of 25...
August 12, 2017: Annals of Epidemiology
https://www.readbyqxmd.com/read/28841254/functional-capacity-in-a-rat-model-of-heart-failure-impact-of-myocardial-infarction-size
#18
Vítor Scotta Hentschke, Lucas Capalonga, Douglas Dalcin Rossato, Júlia Luíza Perini, Jadson Pereira Alves, Edson Quagliotto, Giuseppe Potrick Stefani, Marlus Karsten, Mauro Pontes, Pedro Dal Lago
Oxygen uptake (VO2 ) and exercise tolerance in rats classified by myocardial infarction (MI) size are underexplored. The aim of this study was to evaluate VO2 /carbon dioxide production (VCO2 ) and exercise tolerance in rats that have undergone MI. Fourteen weeks after MI or sham surgery, rats underwent an integrated approach to left ventricular function and VO2 /VCO2 , exercise tolerance and skeletal muscle weight evaluation. Based on MI size determination, rats were assigned to sham operated controls (Sham, n = 12), small myocardial infarction (SMI, n = 8), and large myocardial infarction (LMI, n = 5) groups...
August 25, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28838335/comparative-determination-of-ventilatory-efficiency-from-constant-load-and-incremental-exercise-testing
#19
S Algul, F A Ugur, A Ayar, O Ozcelik
The analysis of the relationships between minute ventilation (VE) to CO2 output (VCO2), referred to as ventilatory efficiency, in response to incremental exercise testing, is considered a useful index for assessing the presence and severity of cardiopulmonary and metabolic diseases. The effects of constant load exercise testing performed at work intensity associated with anaerobic threshold (AT) and respiratory compensation points (RCP), on the accurate measurements of ventilatory efficiency are not well known...
August 15, 2017: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28832892/bronchial-wheezing-predicts-inflammation-and-respiratory-failure-in-fire-smoke-victims
#20
E R Nakstad, H C D Aass, H Opdahl, A Witsø, F Borchsenius, F Heyerdahl, O H Skjønsberg
BACKGROUND: Acute fire smoke inhalation injury involves inflammatory mediators whose roles are poorly understood. We carried out a prospective observational study of fire smoke victims to identify clinical and biochemical markers that may predict pulmonary dysfunction and investigated possible correlations between dysfunction and cytokines in bronchoalveolar lavage (BAL) fluid and blood. METHODS: Forty patients with respiratory and/or neurological symptoms following acute fire smoke inhalation had pulmonary function tests and blood gas analyses performed on admission, at discharge, and after 3 months...
August 17, 2017: Acta Anaesthesiologica Scandinavica
keyword
keyword
91247
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"