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Oxygen uptake kinetics

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https://www.readbyqxmd.com/read/28402178/top-10-research-questions-related-to-youth-aerobic-fitness
#1
Neil Armstrong
Peak oxygen uptake ([Formula: see text]2) is internationally recognized as the criterion measure of youth aerobic fitness, but despite pediatric data being available for almost 80 years, its measurement and interpretation in relation to growth, maturation, and health remain controversial. The trainability of youth aerobic fitness continues to be hotly debated, and causal mechanisms of training-induced changes and their modulation by chronological age, biological maturation, and sex are still to be resolved...
April 12, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28389696/temperature-increases-hypoxia-and-changes-in-food-availability-affect-immunological-biomarkers-in-the-marine-mussel-mytilus-galloprovincialis
#2
M G Parisi, M Mauro, G Sarà, M Cammarata
Temperature increases, hypoxia, and changes in food availability are predicted to occur in the future. There is growing concern for the health status of wild and farmed organisms, since environmental stressors alter organism functions, and elicit coordinated physiological responses for homeostasis. Mussels are good bioindicators of environmental conditions. Their ability to maintain unaltered immunosurveillance under adverse environmental conditions may enhance their survival capability. Few studies are currently concerned with the relationships and feedback among multiple stressors...
April 7, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28357580/the-relationship-between-oxygen-uptake-kinetics-and-neuromuscular-fatigue-in-high-intensity-cycling-exercise
#3
John Temesi, Felipe Mattioni Maturana, Arthur Peyrard, Tatiane Piucco, Juan M Murias, Guillaume Y Millet
PURPOSE: In theory, a slow oxygen uptake ([Formula: see text]) kinetics leads to a greater accumulation of anaerobic by-products, which can, in turn, induce more neuromuscular fatigue. However, the existence of this relationship has never been tested. METHODS: After two sessions to measure peak [Formula: see text], peak power output (POpeak), and [Formula: see text] kinetics responses in the unfatigued state (τ [Formula: see text] MOD), 10 healthy young adults performed a 6-min cycling bout at 80% POpeak (INT6-min)...
March 29, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28338361/method-induced-differences-of-energy-contributions-in-adolescent-female-kayaking
#4
Yongming Li, Margot Niessen, Xiaoping Chen, Ulrich Hartmann
Purpose Different relative aerobic energy contribution (WAER%) has been reported for the two female Olympic kayaking disciplines (i.e. 200 and 500m). The purpose of this study was to investigate whether the adopted method of energy calculation influenced the value of WAER% during the kayaking time trials. Methods Eleven adolescent female kayakers (age 14±1 yrs, height 172±4 cm, body mass 65.4±4.2 kg, VO2peak 42.6±4.9 ml·min(-1)·kg(-1), training experience 1.5±0.3 yrs) volunteered to participate in one incremental exercise test and two time trials (40s and 120s) on the kayak ergometer...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28336535/the-effects-of-short-work-versus-longer-work-periods-within-intermittent-exercise-on-v%C3%AC-o2p-kinetics-muscle-deoxygenation-and-energy-system-contribution
#5
Michael Christopher McCrudden, Daniel A Keir, Glen R Belfry
We examined the effects of inserting 3 s recovery periods during high-intensity cycling exercise at 25 s and 10 s intervals on pulmonary oxygen uptake (V̇O2p), muscle deoxygenation (HHb), associated kinetics (τ), and energy system contributions. Eleven men (24±3 years) completed two trials of three cycling protocols: an 8 min continuous protocol (CONT) and two, 8 min intermittent exercise protocols with work-to-rest periods of 25 s-to-3 s (25INT) and 10 s-to-3 s (10INT). Each protocol began with a step-transition from a 20 W baseline to a power output (PO) of 60% between lactate threshold and maximal V̇O2p (Δ60)...
March 23, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28334542/-an-assessment-of-vo2-kinetics-in-the-recovery-phase-of-cardiopulmonary-exercise-test-in-patients-with-heart-disease-importance-and-classification
#6
Leona Mífková, František Várnay, Pavel Homolka, Petr Dobšák
The article reviews the course of VO2 in the phase of recovery kinetics of oxygen uptake (VO2rec) cardiopulmonary exercise test. VO2rec kinetics cannot be completely defined using a single parameter. The article describes the three most frequently used methods: %VO2-REC2, T1/2 VO2rec and TC VO2, and provides detailed procedures of their analysis. The three aforementioned parameters are also at the heart of our classification of VO2rec. The method %VO2-REC2 is an essential one, in our view, since its prognostic significance is proven and it can be also easily applied only based on a data record of the cardiopulmonary exercise test...
2017: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/28332113/the-critical-power-concept-applications-to-sports-performance-with-a-focus-on-intermittent-high-intensity-exercise
#7
REVIEW
Andrew M Jones, Anni Vanhatalo
The curvilinear relationship between power output and the time for which it can be sustained is a fundamental and well-known feature of high-intensity exercise performance. This relationship 'levels off' at a 'critical power' (CP) that separates power outputs that can be sustained with stable values of, for example, muscle phosphocreatine, blood lactate, and pulmonary oxygen uptake ([Formula: see text]), from power outputs where these variables change continuously with time until their respective minimum and maximum values are reached and exercise intolerance occurs...
March 2017: Sports Medicine
https://www.readbyqxmd.com/read/28301436/the-effects-of-recovery-duration-during-high-intensity-interval-exercise-on-time-spent-at-high-rates-of-oxygen-consumption-oxygen-kinetics-and-blood-lactate
#8
Ilias Smilios, Aristides Myrkos, Andreas Zafeiridis, Argyris Toubekis, Apostolos Spassis, Savas P Tokmakidis
The recovery duration and the work to recovery ratio are important aspects to consider when designing a high-intensity aerobic interval exercise (HIIE). This study examined the effects of recovery duration on total exercise time performed above 80, 90 and 95% of maximum oxygen consumption (VO2max) and heart rate (HRmax) during a single-bout HIIE. We also evaluated the effects on VO2 and HR kinetics, blood lactate concentration and rating of perceived exertion (RPE). Eleven moderately trained males (22.1±1 yrs...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28295552/high-resolution-dynamic-oxygen-17-mr-imaging-of-mouse-brain-with-golden-ratio-based-radial-sampling-and-k-space-weighted-image-reconstruction
#9
Yuchi Liu, Yifan Zhang, Chunying Wu, Junqing Zhu, Charlie Wang, Nicholas Tomko, Mikhail D Linetsky, Robert G Salomon, Ciro Ramos-Estebanez, Yanming Wang, Xin Yu
PURPOSE: The current study aimed to develop a three-dimensional (3D) dynamic oxygen-17 ((17) O) MR imaging method with high temporal and spatial resolution to delineate the kinetics of (17) O water uptake and washout in the brains of mice with glioblastoma (GBM). METHODS: A 3D imaging method with a stack-of-stars golden-ratio-based radial sampling scheme was employed to acquire (17) O signal in vivo. A k-space-weighted image reconstruction method was used to improve the temporal resolution while preserving spatial resolution...
March 13, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28289882/simulating-a-cyclic-activated-sludge-system-by-employing-a-modified-asm3-model-for-wastewater-treatment
#10
Feng Gao, Jun Nan, Xinhui Zhang
To interpret the biological nutrient removal in a cyclic activated sludge system (CAS), a modified model was developed by combining the process of simultaneous storage and growth, and the kinetics of soluble microbial product (S SMP) and extracellular polymeric substance (X EPS) with activated sludge model no. 3 (ASM3). These most sensitive parameters were initially selected whilst parameters with low sensitivity were given values from literature. The selected parameters were then calibrated on an oxygen uptake rate test and a batch CAS reactor on an operational cycle...
March 13, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28289730/indirect-interspecies-regulation-transcriptional-and-physiological-responses-of-a-cyanobacterium-to-heterotrophic-partnership
#11
Hans C Bernstein, Ryan S McClure, Vera Thiel, Natalie C Sadler, Young-Mo Kim, William B Chrisler, Eric A Hill, Donald A Bryant, Margaret F Romine, Janet K Jansson, Jim K Fredrickson, Alexander S Beliaev
The mechanisms by which microbes interact in communities remain poorly understood. Here, we interrogated specific interactions between photoautotrophic and heterotrophic members of a model consortium to infer mechanisms that mediate metabolic coupling and acclimation to partnership. This binary consortium was composed of a cyanobacterium, Thermosynechococcus elongatus BP-1, which supported growth of an obligate aerobic heterotroph, Meiothermus ruber strain A, by providing organic carbon, O2, and reduced nitrogen...
March 2017: MSystems
https://www.readbyqxmd.com/read/28277651/nanoengineering-of-core-shell-magnetic-mesoporous-microspheres-with-tunable-surface-roughness
#12
Qin Yue, Yu Zhang, Yongjian Jiang, Jialuo Li, Hongwei Zhang, Chengzhong Yu, Ahmed A Elzatahry, Abdulaziz Alghamdi, Yonghui Deng, Dongyuan Zhao
Functional core-shell mesoporous microspheres with integrated functions, controlled structure, and surface properties and morphologies have received increasing attention due to their excellent physicochemical properties. Herein, core-shell magnetic mesoporous materials with cauliflower-like morphology and tunable surface roughness have been synthesized through a kinetics-controlled interface co-assembly and deposition of mesostructured nanocomposites on Fe3O4@RF microspheres (RF refers to resorcinol formaldehyde resin)...
March 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28274780/analysis-of-heart-rate-and-oxygen-uptake-kinetics-studied-by-two-different-pseudo-random-binary-sequence-work-rate-amplitudes
#13
U Drescher, J Koschate, T Schiffer, S Schneider, U Hoffmann
PURPOSE: The aim of the study was to compare the kinetics responses of heart rate (HR), pulmonary (V˙O2pulm) and predicted muscular (V˙O2musc) oxygen uptake between two different pseudo-random binary sequence (PRBS) work rate (WR) amplitudes both below anaerobic threshold. METHODS: Eight healthy individuals performed two PRBS WR protocols implying changes between 30W and 80W and between 30W and 110W. HR and V˙O2pulm were measured beat-to-beat and breath-by-breath, respectively...
March 6, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28245246/oxygen-uptake-kinetics-and-energy-system-s-contribution-around-maximal-lactate-steady-state-swimming-intensity
#14
Jailton Gregório Pelarigo, Leandro Machado, Ricardo Jorge Fernandes, Camila Coelho Greco, João Paulo Vilas-Boas
The purpose of this study was to examine the oxygen uptake ([Formula: see text]) kinetics and the energy systems' contribution at 97.5, 100 and 102.5% of the maximal lactate steady state (MLSS) swimming intensity. Ten elite female swimmers performed three-to-five 30 min submaximal constant swimming bouts at imposed paces for the determination of the swimming velocity (v) at 100%MLSS based on a 7 x 200 m intermittent incremental protocol until voluntary exhaustion to find the v associated at the individual anaerobic threshold...
2017: PloS One
https://www.readbyqxmd.com/read/28242825/impact-of-type-2-diabetes-on-cardiorespiratory-function-and-exercise-performance
#15
Joanie Caron, Gregory R duManoir, Lawrence Labrecque, Audrey Chouinard, Annie Ferland, Paul Poirier, Sylvie Legault, Patrice Brassard
The aim of this study was to examine the impact of well-controlled uncomplicated type 2 diabetes (T2D) on exercise performance. Ten obese sedentary men with T2D and nine control participants without diabetes matched for age, sex, and body mass index were recruited. Anthropometric characteristics, blood samples, resting cardiac, and pulmonary functions and maximal oxygen uptake (VO2max) and ventilatory threshold were measured on a first visit. On the four subsequent visits, participants (diabetics: n = 6; controls: n = 7) performed step transitions (6 min) of moderate-intensity exercise on an upright cycle ergometer from unloaded pedaling to 80% of ventilatory threshold...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28240387/linear-and-nonlinear-contributions-to-oxygen-transport-and-utilization-during-moderate-random-exercise-in-humans
#16
T Beltrame, R L Hughson
The assumption of the aerobic system linearity implies that the pulmonary oxygen uptake (pV̇O2) dynamic during exercise transitions present a first-order characteristic. The main objective of this study was to test the linearity of the oxygen delivery-utilization balance during random moderate exercise. The cardiac output (Q̇) and deoxygenated hemoglobin (HHb) were measured to infer about the central and local O2 availability, respectively. Thirteen healthy men performed two consecutive pseudorandom binary sequence cycling exercises followed by an incremental protocol...
February 27, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28239356/sex-and-exercise-intensity-do-not-influence-oxygen-uptake-kinetics-in-submaximal-swimming
#17
Joana F Reis, Gregoire P Millet, Paula M Bruno, Veronica Vleck, Francisco B Alves
The aim of this study was to compare the oxygen uptake ([Formula: see text]) kinetics in front crawl between male and female swimmers at moderate and heavy intensity. We hypothesized that the time constant for the primary phase [Formula: see text] kinetics was faster in men than in women, for both intensities. Nineteen well trained swimmers (8 females mean ± SD; age 17.9 ± 3.5 years; mass 55.2 ± 3.6 kg; height 1.66 ± 0.05 m and 11 male 21.9 ± 2.8 years; 78.2 ± 11.1 kg; 1.81 ± 0.08 m) performed a discontinuous maximal incremental test and two 600-m square wave transitions for both moderate and heavy intensities to determine the [Formula: see text] kinetics parameters using mono- and bi-exponential models, respectively...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28215595/gas-exchange-kinetics-following-concentric-eccentric-isokinetic-arm-and-leg-exercise
#18
U Drescher, S Mookerjee, A Steegmanns, A Knicker, U Hoffmann
PURPOSE: To evaluate the effects of exercise velocity (60, 150, 240deg∙s(-1)) and muscle mass (arm vs leg) on changes in gas exchange and arterio-venous oxygen content difference (avDO2) following high-intensity concentric-eccentric isokinetic exercise. METHODS: Fourteen subjects (26.9±3.1years) performed a 3×20-repetition isokinetic exercise protocol. Recovery beat-to-beat cardiac output (CO) and breath-by-breath gas exchange were recorded to determine post-exercise half-time (t1/2) for oxygen uptake (V˙O2pulm), carbon dioxide output (V˙CO2pulm), and ventilation (V˙E)...
February 17, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28202306/nitrite-oxidation-kinetics-of-two-nitrospira-strains-the-quest-for-competition-and-ecological-niche-differentiation
#19
Norisuke Ushiki, Masaru Jinno, Hirotsugu Fujitani, Toshikazu Suenaga, Akihiko Terada, Satoshi Tsuneda
Nitrite oxidation is an aerobic process of the nitrogen cycle in natural ecosystems, and is performed by nitrite-oxidizing bacteria (NOB). Also, nitrite oxidation is a rate-limiting step of nitrogen removal in wastewater treatment plants (WWTPs). Although Nitrospira is known as dominant NOB in WWTPs, information on their physiological properties and kinetic parameters is limited. Here, we report the kinetic parameters and inhibition of nitrite oxidation by free ammonia in pure cultures of Nitrospira sp. strain ND1 and Nitrospira japonica strain NJ1, which were previously isolated from activated sludge in a WWTP...
February 12, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28201825/heart-rate-and-oxygen-uptake-kinetics-in-type-2-diabetes-patients-a-pilot-study-on-the-influence-of-cardiovascular-medication-on-regulatory-processes
#20
Jessica Koschate, Uwe Drescher, Klaus Baum, Christian Brinkmann, Thorsten Schiffer, Joachim Latsch, Klara Brixius, Uwe Hoffmann
The aim of this pilot study was to investigate whether there are differences in heart rate and oxygen uptake kinetics in type 2 diabetes patients, considering their cardiovascular medication. It was hypothesized that cardiovascular medication would affect heart rate and oxygen uptake kinetics and that this could be detected using a standardized exercise test. 18 subjects were tested for maximal oxygen uptake. Kinetics were measured in a single test session with standardized, randomized moderate-intensity work rate changes...
February 15, 2017: Experimental and Clinical Endocrinology & Diabetes
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