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Recovery oxygen consumption in performance

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https://www.readbyqxmd.com/read/28546848/estimation-of-maximal-oxygen-consumption-and-heart-rate-recovery-using-the-tecumseh-sub-maximal-step-test-and-their-relationship-to-cardiovascular-risk-factors
#1
Alun D Hughes, Nish Chaturvedi
BACKGROUND: Maximum aerobic capacity (VO2max) is associated with lower cardiovascular and total mortality. Step tests can be used to provide an estimate of (VO2max) in epidemiological or home-based studies. We compared different methods of estimation of VO2max and heart rate recovery and evaluated the relationship of these estimates with cardiovascular risk factors. METHODS: Data were analysed from 2286 participants in the Tecumseh Community Health Study (>16y and <70y) who performed a step test...
June 2017: Artery Research
https://www.readbyqxmd.com/read/28542003/providing-choice-in-exercise-influences-food-intake-at-the-subsequent-meal
#2
Natalya J Beer, James A Dimmock, Ben Jackson, Kym J Guelfi
The benefits of regular exercise for health are well established; however, certain behaviors following exercise, such as unhealthy or excessive food consumption, can counteract some of these benefits. PURPOSE: To investigate the effect of autonomy support (through the provision of choice) in exercise - relative to a no-choice condition with matched energy expenditure - on appetite and subsequent energy intake. METHODS: Fifty-eight men and women (body mass index: 22...
May 23, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28497496/percutaneous-left-atrial-decompression-in-adults-with-refractory-cardiogenic-shock-supported-with-veno-arterial-extracorporeal-membrane-oxygenation
#3
Mosaad Alhussein, Mark Osten, Eric Horlick, Heather Ross, Eddy Fan, Vivek Rao, Filio Billia
BACKGROUND AND AIM OF THE STUDY: Left ventricular (LV) distention, a recognized complication in patients supported with veno-arterial extracorporeal membrane oxygenation (VA-ECMO) for refractory cardiogenic shock, can lead to pulmonary edema, increased myocardial oxygen consumption, and LV thrombus formation. Atrial septostomy was examined as a management strategy for LV distension. METHODS: Of 72 patients supported with VA-ECMO, seven patients underwent atrial septostomy through a trans-septal approach...
May 11, 2017: Journal of Cardiac Surgery
https://www.readbyqxmd.com/read/28488137/acute-effects-of-high-intensity-interval-training-and-moderate-intensity-continuous-training-sessions-on-cardiorespiratory-parameters-in-healthy-young-men
#4
Gustavo Zaccaria Schaun, Cristine Lima Alberton, Diego Oliveira Ribeiro, Stephanie Santana Pinto
PURPOSE: The aim of the present study was to compare the energy expenditure (EE) during and after two treadmill protocols, high-intensity interval training (HIIT) and moderate continuous training (CONT), in young adult men. METHODS: The sample was comprised by 26 physically active men aged between 18 and 35 years engaged in aerobic training programs. They were divided into two groups: HIIT (n = 14) which performed eight 20 s bouts at 130% of the velocity associated with the maximal oxygen consumption on a treadmill with 10 s of passive rest, or CONT (n = 12) which performed 30 min running on a treadmill at a submaximal velocity equivalent to 90-95% of the heart rate associated with the anaerobic threshold...
May 9, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28456777/short-term-changes-of-serum-potassium-concentration-induced-by-physical-exercise-in-patient-with-arterial-hypertension-treated-with-angiotensin-converting-enzyme-inhibitor-alone-or-in-combination-with-statin
#5
P Deska, M Nowicki
Intensive physical exercise may facilitate potassium release from skeletal muscles that may result in hyperkalemia. Commonly used drugs including angiotensin converting enzyme inhibitors (ACEI) and statins increase a risk of hyperkalemia. It is not known whether the effect of these drugs on serum potassium during physical exercise is additive. The study compared the effect of physical exercise on the changes of serum potassium in hypertensive patients receiving ACEI alone or in combination with statin. Eighteen patients with arterial hypertension with normal renal function were included in a prospective placebo-controlled cross-over study...
February 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28438305/cardiovascular-response-to-recreational-hockey-in-middle-aged-men
#6
Zack A Goodman, Scott G Thomas, Robert C Wald, Jack M Goodman
The present study examined the hemodynamic response to recreational pick-up hockey relative to maximal exercise testing in middle-aged men. A total of 23 men with a mean age of 53 ± 7 years were studied. Graded exercise testing on a cycle ergometer determined maximal oxygen consumption, blood pressure (BP), and heart rate (HR). Ambulatory BP and Holter electrocardiographic monitoring was performed during one of their weekly hockey games (mean duration = 45 ± 7.2 minutes): for "On-Ice" responses (PLAY; data recorded while standing immediately after a shift; 8...
April 11, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28432665/systemic-and-microcirculatory-effects-of-blood-transfusion-in-experimental-hemorrhagic-shock
#7
Gonzalo Ferrara, Vanina S Kanoore Edul, Héctor S Canales, Enrique Martins, Carlos Canullán, Gastón Murias, Mario O Pozo, Juan F Caminos Eguillor, María G Buscetti, Can Ince, Arnaldo Dubin
BACKGROUND: The microvascular reperfusion injury after retransfusion has not been completely characterized. Specifically, the question of heterogeneity among different microvascular beds needs to be addressed. In addition, the identification of anaerobic metabolism is elusive. The venoarterial PCO2 to arteriovenous oxygen content difference ratio (Pv-aCO2/Ca-vO2) might be a surrogate for respiratory quotient, but this has not been validated. Therefore, our goal was to characterize sublingual and intestinal (mucosal and serosal) microvascular injury after blood resuscitation in hemorrhagic shock and its relation with O2 and CO2 metabolism...
December 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28409397/the-effect-of-high-intensity-aerobic-interval-training-on-markers-of-systemic-inflammation-in-sedentary-populations
#8
Nicholas G Allen, Samuel M Higham, Amy E Mendham, Tegan E Kastelein, Penelope S Larsen, Rob Duffield
PURPOSE: This study examined the effects of high-intensity interval training (HIIT; 30 s sprint, 4-5 min passive recovery) and prolonged intermittent sprint training (PIST; 10 s sprint, 2-3 min moderate exercise) on the systemic inflammatory markers C-reactive protein (CRP) and tumor necrosis factor-α (TNF-α), aerobic capacity, and anthropometry in a middle-aged, sedentary population. METHODS: Fifty-five sedentary adults (age 49.2 ± 6.1 years) were randomised into HIIT (n = 20), PIST (n = 21), or a sedentary control group (CTRL n = 14)...
April 13, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28381445/high-intensity-interval-training-improves-performance-in-young-and-older-individuals-by-increasing-mechanical-efficiency
#9
Georges Jabbour, Horia-Daniel Iancu, Pascale Mauriège, Denis R Joanisse, Luc J Martin
This study evaluated the effects of 6 weeks of high-intensity interval training (HIIT) on mechanical efficiency (ME) in young and older groups. Seventeen healthy young adults [26.2(2.4) year], and thirteen healthy older adults [54.5(2.3) year] completed a 6-week HIIT intervention (three sessions per week) on an electromagnetically braked cycle ergometer. Each HIIT session contained six repetitions of supramaximal exercise intervals (6 seconds each) with 2 min of passive recovery between each repetition...
April 2017: Physiological Reports
https://www.readbyqxmd.com/read/28351620/oxygenated-thawing-and-rewarming-alleviate-rewarming-injury-of-cryopreserved-pancreatic-islets
#10
Hirotake Komatsu, Alyssa Barriga, Leonard Medrano, Keiko Omori, Fouad Kandeel, Yoko Mullen
BACKGROUND/AIMS: Pancreatic islet transplantation is an effective treatment for Type 1 diabetic patients to eliminate insulin injections; however, a shortage of donor organs hinders the widespread use. Although long-term islet storage, such as cryopreservation, is considered one of the key solutions, transplantation of cryopreserved islets is still not practical due to the extensive loss during the cryopreservation-rewarming process. We have previously reported that culturing islets in a hyperoxic environment is an effective treatment to prevent islet death from the hypoxic injury during culture...
March 27, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28325791/individual-variations-in-nitric-oxide-synthase-dependent-sweating-in-young-and-older-males-during-exercise-in-the-heat-role-of-aerobic-power
#11
Tatsuro Amano, Naoto Fujii, Jeffrey C Louie, Robert D Meade, Glen P Kenny
We evaluated the association between aerobic power (defined by peak oxygen consumption; VO2peak) and the contribution of nitric oxide synthase (NOS) to the sweating response in young and older individuals during exercise in the heat. Data from 44 young (24 ± 1 years) and 48 older (61 ± 2 years) males with mean VO2peak of 47.8 ± 2.4 (range, 28.0-62.3) and 39.1 ± 2.3 (range, 26.4-55.7) mLO2 kg(-1) min(-1), respectively, were compiled from our prior studies. Participants performed two 15- to 30-min bouts of exercise at a fixed rate of metabolic heat production of 400 or 500 W, each separated by 15-20 min recovery in the heat (35°C, relative humidity of 20%)...
March 2017: Physiological Reports
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
#12
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/28291304/mitochondrial-dysfunction-in-calf-muscles-of-patients-with-combined-peripheral-arterial-disease-and-diabetes-type-2
#13
Brian Lindegaard Pedersen, Niels Bækgaard, Bjørn Quistorff
BACKGROUND: This study elucidate the effects on muscle mitochondrial function in patients suffering from combined peripheral arterial disease (PAD) and type 2 diabetes (T2D) and the relation to patient symptoms and treatment. METHODS: Near Infra Red Spectroscopy (NIRS) calf muscle exercise tests were conducted on Forty subjects, 15 (PAD), 15 (PAD+T2D) and 10 healthy age matched controls (CTRL) recruited from the vascular outpatient clinic at Gentofte County Hospital, Denmark...
March 14, 2017: International Angiology: a Journal of the International Union of Angiology
https://www.readbyqxmd.com/read/28279900/electrochemical-oxidation-of-cyanide-on-3d-ti-ruo2-anode-using-a-filter-press-electrolyzer
#14
Tzayam Pérez, Rosa L López, José L Nava, Isabel Lázaro, Guillermo Velasco, Roel Cruz, Israel Rodríguez
The novelty of this communication lies in the use of a Ti-RuO2 anode which has not been tested for the oxidation of free cyanide in alkaline media at concentrations similar to those found in wastewater from the Merrill Crowe process (100 mg L(-1) KCN and pH 11), which is typically used for the recovery of gold and silver. The anode was prepared by the Pechini method and characterized by SEM. Linear sweep voltammetries on a Ti-RuO2 rotating disk electrode (RDE) confirmed that cyanide is oxidized at 0.45 < E < 1...
February 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/28194274/moderate-to-deep-sedation-technique-using-propofol-and-ketamine-allowing-synchronised-breathing-for-magnetic-resonance-high-intensity-focused-ultrasound-mr-hifu-treatment-for-uterine-fibroids-a-pilot-study
#15
Hermanus H B Vaessen, F M Knuttel, J M M van Breugel, M E Ikink, J M Dieleman, M A A J van den Bosch, J T A Knape
BACKGROUND: Magnetic resonance high-intensity focused ultrasound (MR-HIFU) treatment for uterine fibroids is rapidly gaining popularity as a treatment modality. This procedure is generally uncomfortable, painful, and requires minimal or absence of movement and an MR-HIFU synchronised breathing pattern of the patient. Procedural sedation and analgesia protocols have become the standard practice in interventional radiology departments worldwide. The aim of this study was to explore if a sedation regimen with low-dose propofol and ketamine performed by trained non-medical sedation practitioners could result in relief of discomfort for the patient and in adequate working conditions for MR-HIFU treatment for uterine fibroids...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28192833/energy-systems-contribution-in-the-running-based-anaerobic-sprint-test
#16
F Milioni, A M Zagatto, R A Barbieri, V L Andrade, J W Dos Santos, C A Gobatto, A S R da Silva, P R P Santiago, M Papoti
The aims of the present study were to verify the contributions of the energy systems during repeated sprints with a short recovery time and the associations of the time- and power-performance of repeated sprints with energetic contributions and aerobic and anaerobic variables. 13 healthy men performed the running-based anaerobic sprint test (RAST) followed by an incremental protocol for lactate minimum intensity determination. During the RAST, the net energy system was estimated using the oxygen consumption and the blood lactate responses...
March 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28179228/dietary-nitrate-does-not-reduce-oxygen-cost-of-exercise-or-improve-muscle-mitochondrial-function-in-mitochondrial-myopathy-patients
#17
Miranda Nabben, Joep P J Schmitz, Jolita Ciapaite, Carlijn M P Le Clercq, Natal A van Riel, Harm R Haak, Klaas Nicolay, Irenaeus F de Coo, Hubert J M Smeets, Stephan F Praet, Luc J C van Loon, Jeanine J Prompers
Muscle weakness and exercise intolerance negatively affect the quality of life of mitochondrial myopathy patients. Short-term dietary nitrate supplementation has been shown to improve exercise performance and reduce oxygen cost of exercise in healthy humans and trained athletes. We investigated if 1 week of dietary inorganic nitrate supplementation decreases the oxygen cost of exercise and improves mitochondrial function in mitochondrial myopathy patients. Ten mitochondrial myopathy patients (40 ± 5 years, maximal whole-body oxygen uptake = 21...
February 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28179195/multiplexed-mri-methods-for-rapid-estimation-of-global-cerebral-metabolic-rate-of-oxygen-consumption
#18
Hyunyeol Lee, Michael C Langham, Ana E Rodriguez-Soto, Felix W Wehrli
The global cerebral metabolic rate of oxygen (CMRO2), which reflects metabolic activity of the brain under various physiologic conditions, can be quantified using a method, referred to as 'OxFlow', which simultaneously measures hemoglobin oxygen saturation in a draining vein (Yv) and total cerebral blood flow (tCBF). Conventional OxFlow (Conv-OxFlow) entails four interleaves incorporated in a single pulse sequence - two for phase-contrast based measurement of tCBF in the supplying arteries of the neck, and two to measure the intra- to extravascular phase difference in the superior sagittal sinus to derive Yv [Jain et al...
April 1, 2017: NeuroImage
https://www.readbyqxmd.com/read/28150139/acute-effects-of-moderate-continuous-training-on-stress-test-related-pulse-pressure-and-wave-reflection-in-healthy-men
#19
Florian Milatz, Sascha Ketelhut, Reinhard G Ketelhut
INTRODUCTION: Arterial dysfunction develops early in life even in individuals with modest cardiovascular risk. Stress is associated with increased risk in cardiovascular morbidity and mortality. AIM: The main objectives of this study were to investigate the acute effects of moderate continuous training (MCT) on established markers of arterial stiffness and cardiovascular risk during standardized cold pressor stress testing (CPT). METHODS: 29 young healthy male subjects (33...
February 2, 2017: High Blood Pressure & Cardiovascular Prevention: the Official Journal of the Italian Society of Hypertension
https://www.readbyqxmd.com/read/28121183/betalain-rich-concentrate-supplementation-improves-exercise-performance-and-recovery-in-competitive-triathletes
#20
RANDOMIZED CONTROLLED TRIAL
Cristhian F Montenegro, David A Kwong, Zev A Minow, Brian A Davis, Christina F Lozada, Gretchen A Casazza
We aimed to determine the effects of a betalain-rich concentrate (BRC) of beetroots, containing no sugars or nitrates, on exercise performance and recovery. Twenty-two (9 men and 13 women) triathletes (age, 38 ± 11 years) completed 2 double-blind, crossover, randomized trials (BRC and placebo) starting 7 days apart. Each trial was preceded by 6 days of supplementation with 100 mg·day(-1) of BRC or placebo. On the 7th day of supplementation, exercise trials commenced 120 min after ingestion of 50 mg BRC or placebo and consisted of 40 min of cycling (75 ± 5% maximal oxygen consumption) followed by a 10-km running time trial (TT)...
February 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
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