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Oxygen uptake kinetics

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https://www.readbyqxmd.com/read/29394491/impact-of-l-citrulline-supplementation-on-oxygen-uptake-kinetics-during-walking
#1
John Ashley, Youngdeok Kim, Joaquin U Gonzales
Supplementation with L-citrulline (Cit) has been shown to improve muscle oxygenation and oxygen uptake (VO2) kinetics during moderate-to-high intensity cycling in young men. The aim of this study was to test the hypothesis whether Cit would improve VO2 kinetics during walking in older and young adults. In a randomized, double-blind study, 26 (15 women, 11 men) adults between the ages of 20-35y (n = 15) and 64-86y (n = 11) completed 7 day periods of taking placebo and L-citrulline (6 g/day) in a crossover manner...
February 2, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29334615/hemodynamic-and-metabolic-responses-to-self-paced-and-ramp-graded-exercise-testing-protocols
#2
Nicholas M Beltz, Fabiano Amorim, Ann L Gibson, Jeffrey M Janot, Len Kravitz, Christine M Mermier, Nathan Cole, Terence A Moriarty, Tony P Nunez, Sam Trigg, Lance Dalleck
PURPOSE: Recent examinations have shown lower maximal oxygen uptake (VO2max) during traditional ramp (RAMP) compared to self-paced (SPV) graded exercise testing (GXT) attributed to differences in cardiac ouput. The current study examined the differences in hemodyamic and metabolic responses between RAMP and SPV during treadmill exercise. METHODS: Sixteen recreationally trained men (23.7±3.0 yrs) completed two separate treadmill GXT protocols. SPV consisted of five 2-min stages (10 min total) of increasing speed clamped by the Borg RPE6-20 scale...
January 15, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29331919/removal-of-pharmaceutical-pollutants-from-synthetic-wastewater-using-chemically-modified-biomass-of-green-alga-scenedesmus-obliquus
#3
Mohamed E M Ali, Azza M Abd El-Aty, Mohamed I Badawy, Rizka K Ali
Pharmaceutical compounds are considered emerging environmental pollutants that have a potential harmful impact on environment and human health. In this study, the biomass of alga (Scenedesmus obliquus) was modified using alkaline solution, and used for the biosorption of tramadol (TRAM) and other pharmaceuticals. The adsorption kinetics and isotherms were investigated. The obtained results reveal high adsorption capacity of tramadol over modified algal biomass (MAB) after 45min with removal percentage of 91%...
January 11, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29279000/oxygen-uptake-on-kinetics-during-six-minute-walk-test-predicts-short-term-outcomes-after-off-pump-coronary-artery-bypass-surgery
#4
Isadora Salvador Rocco, Marcela Viceconte, Hayanne Osiro Pauletti, Bruna Caroline Matos-Garcia, Natasha Oliveira Marcondi, Caroline Bublitz, Douglas William Bolzan, Rita Simone Lopes Moreira, Michel Silva Reis, Nelson Américo Hossne, Walter José Gomes, Ross Arena, Solange Guizilini
PURPOSE: We aimed to investigate the ability of oxygen uptake kinetics to predict short-term outcomes after off-pump coronary artery bypass grafting. METHODS: Fifty-two patients aged 60.9 ± 7.8 years waiting for off-pump coronary artery bypass surgery were evaluated. The 6-min walk test distance was performed pre-operatively, while simultaneously using a portable cardiopulmonary testing device. The transition of oxygen uptake kinetics from rest to exercise was recorded to calculate oxygen uptake kinetics fitting a monoexponential regression model...
December 26, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/29276855/assessing-differences-in-cardiorespiratory-fitness-with-respect-to-maturity-status-in-highly-trained-youth-soccer-players
#5
Greg Doncaster, John Iga, Viswanath Unnithan
PURPOSE: The purpose of the study was to examine differences in measures of cardiorespiratory fitness and determinants of running economy with respect to maturity status in a group of highly trained youth soccer players. METHODS: A total of 21 highly trained youth soccer players participated in this study. On separate visits, players' peak oxygen uptake (VO2peak), running economy at 3 different speeds [8 km·h-1, 80% gaseous exchange threshold (GET), and 95% GET], and pulmonary oxygen uptake (VO2) kinetics were determined...
December 23, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/29250707/non-invasive-estimation-of-muscle-oxygen-uptake-kinetics-with-pseudorandom-binary-sequence-and-step-exercise-responses
#6
Uwe Drescher, R Schmale, J Koschate, L Thieschäfer, T Schiffer, S Schneider, U Hoffmann
PURPOSE: The aim of the study was to test for significant differences in non-invasively estimated muscle oxygen uptake ([Formula: see text]) kinetics, assessed by a square-wave exercise protocol (STEP) as well as by a time series approach with pseudorandom binary sequence (PRBS) work rate (WR) changes. METHODS: Seventeen healthy and active individuals (10 women, 7 men; 23 ± 2 years old; height 175 ± 11 cm; body mass 73 ± 14 kg [mean ± SD]) completed five repetitions of WR transitions from 30 to 80 W for the STEP approach and two sequences of pseudorandom binary WR changes between 30 and 80 W for the PRBS approach...
December 18, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29239779/gender-differences-in-residual-effect-of-prior-drop-jumps-on-oxygen-uptake-during-heavy-cycling-exercise
#7
Neringa Baranauskienė, Sandra Kilikevičienė, Loreta Stasiulė, Genuvaitė Civinskienė, Arvydas Stasiulis
BACKGROUND AND OBJECTIVE: Unaccustomed eccentric or eccentric-concentric exercise leaves us stiff and sore the next day and can cause muscle damage. The data about the residual effect of prior eccentric-concentric exercises on oxygen uptake (VO2) during constant cycling exercise in women or the data about differences of such effect between genders are scarce. Therefore, the aim of this study was to assess differences of the residual effect of PDJ on VO2 during HCE and indirect muscle damage parameters between women and men...
November 1, 2017: Medicina
https://www.readbyqxmd.com/read/29210688/the-importance-of-surface-functional-groups-in-the-adsorption-of-copper-onto-walnut-shell-derived-activated-carbon
#8
Ruzhen Xie, Yan Jin, Yao Chen, Wenju Jiang
In this study, activated carbon (AC) was prepared from walnut shell using chemical activation. The surface chemistry of the prepared AC was modified by introducing or blocking certain functional groups, and the role of the different functional groups involved in the copper uptake was investigated. The structural and chemical heterogeneity of the produced carbons are characterized by Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, Boehm titration method and N2/77 K adsorption isotherm analysis...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29182413/energetic-profile-of-the-basketball-exercise-simulation-test-in-junior-elite-players
#9
Richard Latzel, Olaf Hoos, Sebastian Stier, Sebastian Kaufmann, Volker Fresz, Dominik Reim, Ralph Beneke
PURPOSE: To analyze the energetic profile of the basketball exercise simulation test (BEST). METHODS: 10 male elite junior basketball players (age: 15.5±0.6yrs, height: 180±9cm, body mass: 66.1±11.2kg) performed a modified BEST (20 circuits consisting of jumping, sprinting, jogging, shuffling, and short breaks) simulating professional basketball game play. Circuit time, sprint time, sprint decrement, oxygen uptake (VO2), heart rate (HR), and blood lactate concentration (BLC) were obtained...
November 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29161578/probabilistic-pharmacokinetic-models-of-decompression-sickness-in-humans-part-2-coupled-perfusion-diffusion-models
#10
F Gregory Murphy, Ethan A Hada, David J Doolette, Laurens E Howle
Decompression sickness (DCS) can be experienced following a reduction in ambient pressure; such as that associated with diving or ascent to high altitudes. DCS is believed to result when supersaturated inert gas dissolved in biological tissues exits solution and forms bubbles. Models to predict the probability of DCS are typically based on nitrogen and/or helium gas uptake and washout in several theoretical tissues, each represented by a single perfusion-limited compartment. It has been previously shown that coupled perfusion-diffusion compartments are better descriptors than solely perfusion-based models of nitrogen and helium uptake and elimination kinetics observed in the brain and skeletal muscle of sheep...
November 15, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29157149/stabilized-landfill-leachate-treatment-using-guadua-amplexifolia-bamboo-as-source-of-activated-carbon-kinetics-study
#11
Bianka G Salas-Enríquez, Aidé M Torres-Huerta, Eloy Conde-Barajas, Miguel A Domínguez-Crespo, María L X Negrete-Rodríguez, Héctor J Dorantes-Rosales, Ana B López-Oyama
In the present study, the characteristics of leachate generated from dumpsite called "Zapote" located in southern region of Tamaulipas, Mexico were evaluated. The adsorption of non-biodegradable organic matter measured as chemical oxygen demand (COD), color and heavy metals from leachate on activated carbon prepared in acid media from Guadua amplexifolia bamboo has been studied. In addition, the computation of kinetic parameters during the adsorption process as well as the most probable mechanisms was determined...
November 20, 2017: Environmental Technology
https://www.readbyqxmd.com/read/29154138/preparation-of-biochar-from-enteromorpha-prolifera-and-its-use-for-the-removal-of-polycyclic-aromatic-hydrocarbons-pahs-from-aqueous-solution
#12
Kaili Qiao, Weijun Tian, Jie Bai, Jie Dong, Jing Zhao, Xiaoxi Gong, Shuhui Liu
EP-biochar was produced from Enteromorpha prolifera (EP) at temperatures of 200-600°C under limited-oxygen conditions and then activated using HCl and HF. To optimize the sorption of pyrene (PYR) and benzo[a]pyrene (BaP), the effect of the pyrolysis temperature was studied, and the results showed that EP-biochar produced at 500°C gave the highest removal efficiency. The physiochemical properties of EP-biochar pyrolyzed at 500°C were characterized. The examination indicated that the surface area of EP-biochar was 205...
November 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29140137/v%C3%AC-o2-and-muscle-deoxygenation-kinetics-during-skating-comparison-between-slide-board-and-treadmill-skating
#13
Tatiane Piucco, Rogério Soares, Fernando Diefenthaeler, Guillaume Millet, Juan Murias
PURPOSE: this study aimed to compare the oxygen uptake (V̇O2) kinetics during skating on a treadmill and skating on a slide board and discuss potential mechanisms that might control the V̇O2 kinetics responses during skating. METHODS: breath-by-breath pulmonary V̇O2 and near-infrared spectroscopy-derived muscle deoxygenation ([HHbMb]) were monitored continuously in 12 well-trained young long track speed skaters. On-transient V̇O2 and [HHbMb] responses to skating on a treadmill and skating on a slide board at 80% of the estimated gas exchange threshold were fitted as mono-exponential function...
November 15, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29139577/copper-uptake-patterns-of-bioaccumulation-and-effects-in-glochidia-larvae-of-the-freshwater-mussel-lampsilis-cardium
#14
Marianna Basso Jorge, Adalto Bianchini, Chris M Wood, Patricia L Gillis
The early life stages of freshwater mussels are particularly sensitive to Cu contamination. We measured the acute toxicity, bioaccumulation and sublethal effects of Cu in glochidia. Additionally, we used radiolabeled Cu ((64) Cu) to examine the time-dependent kinetics of uptake over 24 h. (64) Cu uptake by live and dead glochidia exposed to 0.11 μmol/L exhibited similar hyperbolic patterns over the first 40 min, indicating an adsorptive phase independent of larval metabolism. Thereafter, uptake was linear with time, with a 10-fold lower bioaccumulation rate in live than in dead animals, representing a close to steady state of Cu regulation...
November 15, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29119418/low-level-laser-therapy-improves-the-vo2-kinetics-in-competitive-cyclists
#15
Fábio J Lanferdini, Renata L Krüger, Bruno M Baroni, Caetano Lazzari, Pedro Figueiredo, Alvaro Reischak-Oliveira, Marco A Vaz
Some evidence supports that low-level laser therapy (LLLT) reduces neuromuscular fatigue, so incrementing sports performance. A previous randomized controlled trial of our group showed increased exercise tolerance in male competitive cyclists treated with three different LLLT doses (3, 6, and 9 J/diode; or 135, 270, and 405 J/thigh) before time-to-exhaustion cycling tests. Now, the present study was designed to evaluate the effects of these LLLT doses on the VO2 kinetics of athletes during cycling tests. Twenty male competitive cyclists (29 years) participated in a crossover, randomized, double-blind, and placebo-controlled trial...
November 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29117249/multimodel-inference-applied-to-oxygen-recovery-kinetics-after-6-min-walk-tests-in-patients-with-chronic-obstructive-pulmonary-disease
#16
Florent Baty, Christian Ritz, Signe Marie Jensen, Lukas Kern, Michael Tamm, Martin Hugo Brutsche
6-min walk tests (6MWT) are routinely performed in patients with chronic obstructive pulmonary disease (COPD). Oxygen uptake ([Formula: see text]) kinetics during 6MWT can be modeled and derived parameters provide indicators of patients' exercise capacity. Post-exercise [Formula: see text] recovery also provides important parameters of patients' fitness which has not been extensively investigated in COPD. Several nonlinear regression models with different underlying biological assumptions may be suitable for describing recovery kinetics...
2017: PloS One
https://www.readbyqxmd.com/read/29091934/effects-of-hyperoxia-on-18f-fluoro-misonidazole-brain-uptake-and-tissue-oxygen-tension-following-middle-cerebral-artery-occlusion-in-rodents-pilot-studies
#17
Tim D Fryer, Sohail Ejaz, Ulf Jensen-Kondering, David J Williamson, Sergey Sitnikov, Stephen J Sawiak, Franklin I Aigbirhio, Young T Hong, Jean-Claude Baron
PURPOSE: Mapping brain hypoxia is a major goal for stroke diagnosis, pathophysiology and treatment monitoring. 18F-fluoro-misonidazole (FMISO) positron emission tomography (PET) is the gold standard hypoxia imaging method. Normobaric hyperoxia (NBO) is a promising therapy in acute stroke. In this pilot study, we tested the straightforward hypothesis that NBO would markedly reduce FMISO uptake in ischemic brain in Wistar and spontaneously hypertensive rats (SHRs), two rat strains with distinct vulnerability to brain ischemia, mimicking clinical heterogeneity...
2017: PloS One
https://www.readbyqxmd.com/read/29074573/reply-to-francescato-et-al-interpreting-the-averaging-methods-to-estimate-oxygen-uptake-kinetics-parameters
#18
Alan P Benson, T Scott Bowen, Carrie Ferguson, Scott R Murgatroyd, Harry B Rossiter
No abstract text is available yet for this article.
October 1, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29055837/removal-of-the-pesticide-tebuconazole-in-constructed-wetlands-design-comparison-influencing-factors-and-modelling
#19
Tao Lyu, Liang Zhang, Xiao Xu, Carlos A Arias, Hans Brix, Pedro N Carvalho
Constructed wetlands (CWs) are a promising technology to treat pesticide contaminated water, but its implementation is impeded by lack of data to optimize designs and operating factors. Unsaturated and saturated CW designs were used to compare the removal of triazole pesticide, tebuconazole, in unplanted mesocosms and mesocosms planted with five different plant species: Typha latifolia, Phragmites australis, Iris pseudacorus, Juncus effusus and Berula erecta. Tebuconazole removal efficiencies were significantly higher in unsaturated CWs than saturated CWs, showing for the first time the potential of unsaturated CWs to treat tebuconazole contaminated water...
October 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29052015/stoichiometry-and-kinetics-of-single-and-mixed-substrate-uptake-in-aspergillus-niger
#20
Francisca Lameiras, Cor Ras, Angela Ten Pierick, Joseph J Heijnen, Walter M van Gulik
In its natural environment, the filamentous fungus Aspergillus niger grows on decaying fruits and plant material, thereby enzymatically degrading the lignocellulosic constituents (lignin, cellulose, hemicellulose, and pectin) into a mixture of mono- and oligosaccharides. To investigate the kinetics and stoichiometry of growth of this fungus on lignocellulosic sugars, we carried out batch cultivations on six representative monosaccharides (glucose, xylose, mannose, rhamnose, arabinose, and galacturonic acid) and a mixture of these...
October 19, 2017: Bioprocess and Biosystems Engineering
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