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"Oxygen uptake kinetics"

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https://www.readbyqxmd.com/read/28450551/data-collection-handling-and-fitting-strategies-to-optimize-accuracy-and-precision-of-oxygen-uptake-kinetics-estimation-from-breath-by-breath-measurements
#1
Alan P Benson, T Scott Bowen, Carrie Ferguson, Scott R Murgatroyd, Harry B Rossiter
Phase 2 pulmonary oxygen uptake kinetics (ϕ2 τVO2P) reflect muscle oxygen consumption dynamics and are sensitive to changes in state of training or health. This study identified an unbiased method for data collection, handling and fitting to optimize VO2P kinetics estimation. A validated computational model of VO2P kinetics and a Monte Carlo approach simulated 2 x 10(5) moderate intensity transitions using a distribution of metabolic and circulatory parameters spanning normal health. Effects of averaging (interpolation, binning, stacking or separate fitting of up to 10 transitions) and fitting procedures (bi-exponential fitting, or ϕ2 isolation by time removal, statistical or derivative methods followed by mono-exponential fitting) on accuracy and precision of ϕ2 τVO2P estimation were assessed...
April 27, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28357580/the-relationship-between-oxygen-uptake-kinetics-and-neuromuscular-fatigue-in-high-intensity-cycling-exercise
#2
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/28274780/analysis-of-heart-rate-and-oxygen-uptake-kinetics-studied-by-two-different-pseudo-random-binary-sequence-work-rate-amplitudes
#3
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...
June 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
#4
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/28239356/sex-and-exercise-intensity-do-not-influence-oxygen-uptake-kinetics-in-submaximal-swimming
#5
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
#6
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)...
June 2017: Respiratory Physiology & Neurobiology
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
#7
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
https://www.readbyqxmd.com/read/28151429/the-influence-of-adipose-tissue-on-spatially-resolved-near-infrared-spectroscopy-derived-skeletal-muscle-oxygenation-the-extent-of-the-problem
#8
Victor M Niemeijer, Jasper P Jansen, Thomas van Dijk, Ruud F Spee, Eduard J Meijer, Hareld M C Kemps, Pieter F F Wijn
OBJECTIVE: Near-infrared spectroscopy (NIRS) measurements of tissue oxygen saturation (StO2) are useful for the assessment of skeletal muscle perfusion and function during exercise, however, they are influenced by overlying skin and adipose tissue. This study explored the extent and nature of the influence of adipose tissue thickness (ATT) on StO2. APPROACH: NIR spatially resolved spectroscopy (SRS) derived oxygenation was measured on vastus lateralis in 56 patients with chronic heart failure (CHF) and 20 healthy control (HC) subjects during rest and moderate intensity exercise with simultaneous assessment of oxygen uptake kinetics (τ [Formula: see text])...
February 2, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/27993287/addition-of-vitamin-b12-to-exercise-training-improves-cycle-ergometer-endurance-in-advanced-copd-patients-a-randomized-and-controlled-study
#9
Fernanda Viana Paulin, Alessandro Moura Zagatto, Gaspar R Chiappa, Paulo de Tarso Müller
Vitamin B12 is essential in the homocysteine, mitochondrial, muscle and hematopoietic metabolisms, and its effects on exercise tolerance and kinetics adjustments of oxygen consumption (V'O2p) in rest-to-exercise transition in COPD patients are unknown. This randomized, double-blind, controlled study aimed to verify a possible interaction between vitamin B12 supplementation and these outcomes. After recruiting 69 patients, 35 subjects with moderate-to-severe COPD were eligible and 32 patients concluded the study, divided into four groups (n = 8 for each group): 1...
January 2017: Respiratory Medicine
https://www.readbyqxmd.com/read/27979503/effect-of-physical-training-on-the-recovery-of-acute-exercise-among-patients-with-cardiovascular-disease
#10
Marianna García-Saldivia, Hermes Ilarraza-Lomelí, Jonathan Myers, Jorge Lara, Leopoldo Bueno
INTRODUCTION: Physical training programs (PTP) have shown several beneficial effects for patients with cardiovascular disease (CVD), particularly by increasing survival and quality of life. Physiological response during the effort and recovery phases of an exercise testing, is one of the strongest prognostic markers among patients with CVD. A reasonable mechanism that explains those training effects on survival is through the adaptations seen on heart rate recovery (HRR) and oxygen uptake kinetics at the post-exertional phase (RVO2)...
December 12, 2016: Archivos de Cardiología de México
https://www.readbyqxmd.com/read/27819153/faster-heart-rate-and-muscular-oxygen-uptake-kinetics-in-type-2-diabetes-patients-following-endurance-training
#11
Jessica Koschate, Uwe Drescher, Christian Brinkmann, Klaus Baum, Thorsten Schiffer, Joachim Latsch, Klara Brixius, Uwe Hoffmann
Cardiorespiratory kinetics were analyzed in type 2 diabetes patients before and after a 12-week endurance exercise-training intervention. It was hypothesized that muscular oxygen uptake and heart rate (HR) kinetics would be faster after the training intervention and that this would be detectable using a standardized work rate protocol with pseudo-random binary sequences. The cardiorespiratory kinetics of 13 male sedentary, middle-aged, overweight type 2 diabetes patients (age, 60 ± 8 years; body mass index, 33 ± 4 kg·m(-2)) were tested before and after the 12-week exercise intervention...
November 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/27790156/locomotor-muscle-fatigue-does-not-alter-oxygen-uptake-kinetics-during-high-intensity-exercise
#12
James G Hopker, Giuseppe Caporaso, Andrea Azzalin, Roger Carpenter, Samuele M Marcora
The [Formula: see text] slow component ([Formula: see text]) that develops during high-intensity aerobic exercise is thought to be strongly associated with locomotor muscle fatigue. We sought to experimentally test this hypothesis by pre-fatiguing the locomotor muscles used during subsequent high-intensity cycling exercise. Over two separate visits, eight healthy male participants were asked to either perform a non-metabolically stressful 100 intermittent drop-jumps protocol (pre-fatigue condition) or rest for 33 min (control condition) according to a random and counterbalanced order...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27786541/postexercise-cold-water-immersion-improves-intermittent-high-intensity-exercise-performance-in-normothermia
#13
RANDOMIZED CONTROLLED TRIAL
Avina McCarthy, James Mulligan, Mikel Egaña
A brief cold water immersion between 2 continuous high-intensity exercise bouts improves the performance of the latter compared with passive recovery in the heat. We investigated if this effect is apparent in normothermic conditions (∼19 °C), employing an intermittent high-intensity exercise designed to reflect the work performed at the high-intensity domain in team sports. Fifteen young active men completed 2 exhaustive cycling protocols (Ex1 and Ex2: 12 min at 85% ventilatory threshold (VT) and then an intermittent exercise alternating 30-s at 40% peak power (Ppeak) and 30 s at 90% Ppeak to exhaustion) separated by 15 min of (i) passive rest, (ii) 5-min cold-water immersion at 8 °C, and (iii) 10-min cold-water immersion at 8 °C...
November 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/27784687/dietary-nitrate-supplementation-and-exercise-tolerance-in-patients-with-heart-failure-with-reduced-ejection-fraction
#14
Daniel M Hirai, Joel T Zelt, Joshua H Jones, Luiza G Castanhas, Robert F Bentley, Wendy Earle, Patti Staples, Michael E Tschakovsky, John McCans, Denis E O'Donnell, J Alberto Neder
Endothelial dysfunction and reduced nitric oxide (NO) signaling are key abnormalities leading to skeletal muscle oxygen delivery-utilization mismatch and poor physical capacity in patients with heart failure with reduced ejection fraction (HFrEF). Oral inorganic nitrate supplementation provides an exogenous source of NO that may enhance locomotor muscle function and oxygenation with consequent improvement in exercise tolerance in HFrEF. Thirteen patients (left ventricular ejection fraction ≤40%) were enrolled in a double-blind, randomized crossover study to receive concentrated nitrate-rich (nitrate) or nitrate-depleted (placebo) beetroot juice for 9 days...
January 1, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27777059/metabolic-mechanisms-of-vocal-fatigue
#15
Chayadevie Nanjundeswaran, Jessie VanSwearingen, Katherine Verdolini Abbott
OBJECTIVE: This study aimed to identify potential metabolic mechanisms including (1) neuromuscular inefficiency, (2) cardiovascular recovery deficits, or (3) both, in individuals with complaints of vocal fatigue. STUDY DESIGN: Within- and between-subjects group design was used in this study. METHODS: Three groups of women participated in the study, including (1) individuals with complaints of vocal fatigue; (2) vocally healthy sedentary individuals; and (3) vocally healthy, cardiovascularly conditioned individuals...
October 21, 2016: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/27765748/limitations-of-skeletal-muscle-oxygen-delivery-and-utilization-during-moderate-intensity-exercise-in-moderately-impaired-patients-with-chronic-heart-failure
#16
Victor M Niemeijer, Ruud F Spee, Thijs Schoots, Pieter F F Wijn, Hareld M C Kemps
The extent and speed of transient skeletal muscle deoxygenation during exercise onset in patients with chronic heart failure (CHF) are related to impairments of local O2 delivery and utilization. This study examined the physiological background of submaximal exercise performance in 19 moderately impaired patients with CHF (Weber class A, B, and C) compared with 19 matched healthy control (HC) subjects by measuring skeletal muscle oxygenation (SmO2) changes during cycling exercise. All subjects performed two subsequent moderate-intensity 6-min exercise tests (bouts 1 and 2) with measurements of pulmonary oxygen uptake kinetics and SmO2 using near-infrared spatially resolved spectroscopy at the vastus lateralis for determination of absolute oxygenation values, amplitudes, kinetics (mean response time for onset), and deoxygenation overshoot characteristics...
December 1, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27701422/differential-responses-of-post-exercise-recovery-of-leg-blood-flow-and-oxygen-uptake-kinetics-in-hfpef-versus-hfref
#17
Richard B Thompson, Joseph J Pagano, Kory W Mathewson, Ian Paterson, Jason R Dyck, Dalane W Kitzman, Mark J Haykowsky
The goals of the current study were to compare leg blood flow, oxygen extraction and oxygen uptake (VO2) after constant load sub-maximal unilateral knee extension (ULKE) exercise in patients with heart failure with reduced ejection fraction (HFrEF) compared to those with preserved ejection fraction (HFpEF). Previously, it has been shown that prolonged whole body VO2 recovery kinetics are directly related to disease severity and all-cause mortality in HFrEF patients. To date, no study has simultaneously measured muscle-specific blood flow and oxygen extraction post exercise recovery kinetics in HFrEF or HFpEF patients; therefore it is unknown if muscle VO2 recovery kinetics, and more specifically, the recovery kinetics of blood flow and oxygen extraction at the level of the muscle, differ between HF phenotypes...
2016: PloS One
https://www.readbyqxmd.com/read/27594875/submaximal-oxygen-uptake-kinetics-functional-mobility-and-physical-activity-in-older-adults-with-heart-failure-and-reduced-ejection-fraction
#18
Scott L Hummel, John Herald, Craig Alpert, Kimberlee A Gretebeck, Wendy S Champoux, Donald R Dengel, Peter V Vaitkevicius, Neil B Alexander
BACKGROUND: Submaximal oxygen uptake measures are more feasible and may better predict clinical cardiac outcomes than maximal tests in older adults with heart failure (HF). We examined relationships between maximal oxygen uptake, submaximal oxygen kinetics, functional mobility, and physical activity in older adults with HF and reduced ejection fraction. METHODS: Older adults with HF and reduced ejection fraction (n = 25, age 75 ± 7 years) were compared to 25 healthy age- and gender-matched controls...
July 2016: Journal of Geriatric Cardiology: JGC
https://www.readbyqxmd.com/read/27584204/effect-of-blood-flow-restricted-cycle-training-on-oxygen-uptake-kinetics-during-exercise-114-board-3-june-1-9-30-am-11-30-am
#19
Norio Hotta, Hisayoshi Ogata, Takaharu Kondo, Koji Ishida, Michael R Kushnick
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27584202/chronic-omega-3-fatty-acid-supplementation-and-oxygen-uptake-kinetics-during-heavy-exercise-112-board-1-june-1-9-30-am-11-30-am
#20
Chad C Wiggins, Shane A Bielko, Allison J Campbell, Timothy D Mickleborough, Robert F Chapman
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
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