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Recovery oxygen consumption in performance

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https://www.readbyqxmd.com/read/29114503/effects-of-long-or-short-duration-stimulus-during-high-intensity-interval-training-on-physical-performance-energy-intake-and-body-composition
#1
Elaine Domingues Alves, Gabriela Pires Salermo, Valéria Leme Gonçalves Panissa, Emerson Franchini, Monica Yuri Takito
To compare the effects of 6 weeks of long or short high-intensity interval training (long- or short-HIIT) on body composition, hunger perception, food intake and rating of perceived exertion (RPE). Twenty previously untrained women (25±5 years) were randomly assigned to do a long-HIIT (n=10) or a short-HIIT (n=10). The long-HIIT group performed fifteen 1-min bouts at 90% of maximum heart rate (HRmax), interspersed by 30-sec active recovery (60% HRmax). The short-HIIT group performed forty-five 20-sec bouts at 90% of HRmax, interspersed by 10-sec active recovery (60% HRmax)...
August 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29091471/the-effect-of-a-dietary-nitrate-supplementation-in-the-form-of-a-single-shot-of-beetroot-juice-on-static-and-dynamic-apnoea-performance
#2
Matthew J Barlow, Antonis Elia, Oliver M Shannon, Angeliki Zacharogianni, Angelica Lodin-Sundstrom
INTRODUCTION: The purpose of the present study was to assess the effects of acute nitrate (NO3(-))-rich beetroot juice supplementation on peripheral oxygen saturation (SpO2), heart rate (HR), and pulmonary gas exchange during submaximal static and dynamic apnoea. METHODS: Nine (six male, three female) trained apneists (age: 39.6 ± 8.2 years, stature: 170.4 ± 11.5cm, body mass: 72.0 ± 11.5 kg) performed three submaximal static apnoeas at 60%, 70% and 80% of the participant's current reported personal best time, followed by three submaximal (~ 75% or personal best distance) dynamic apnoeas following the consumption of either a 140 ml concentrated NO3(-)-rich beetroot juice (BRJ; 7...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29045327/aging-impairs-whole-body-heat-loss-in-women-under-both-dry-and-humid-heat-stress
#3
Sean R Notley, Martin P Poirier, Stephen G Hardcastle, Andreas D Flouris, Pierre Boulay, Ronald J Sigal, Glen P Kenny
PURPOSE: This study was designed to determine whether age-related impairments in whole-body heat loss, which are known to exist in dry heat, also occur in humid heat in women. METHODS: To evaluate this possibility, 10 young (25 ± 4 yr) and 10 older (51 ± 7 yr) women matched for body surface area (young, 1.69 ± 0.11; older, 1.76 ± 0.14 m, P = 0.21) and peak oxygen consumption (V˙O2peak) (young, 38.6 ± 4.6; older, 34.8 ± 6.6 mL·kg·min, P = 0.15) performed four 15-min bouts of cycling at a fixed metabolic heat production rate (300 W; equivalent to ~45% V˙O2peak), each separated by a 15-min recovery, in dry (35°C, 20% relative humidity) and humid heat (35°C, 60% relative humidity)...
November 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29045315/a-single-dose-of-oral-atp-supplementation-improves-performance-and-physiological-response-during-lower-body-resistance-exercise-in-recreational-resistance-trained-males
#4
Marcelo C Freitas, Jason M Cholewa, Jose Gerosa-Neto, Daniela C Gonçalves, Erico C Caperuto, Fábio S Lira, Fabrício E Rossi
The aim of this study was to investigate the acute effect of ATP supplementation on performance and physiological responses during resistance exercise in recreationally resistance trained males. Eleven men (age= 27.5±5.5 yrs, weight= 83.4±9.8 kg, height= 182±0.04 cm) completed two randomized, double-blind trials: ATP supplement condition (ATP=400mg) or a placebo condition. Thirty minutes after supplement consumption, subjects performed four sets of half-squats until momentary muscular failure at 80% of the 1RM with two minutes of recovery between sets...
October 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28975517/the-effects-of-hyperoxia-on-sea-level-exercise-performance-training-and-recovery-a-meta-analysis
#5
REVIEW
Matthew M Mallette, Desmond G Stewart, Stephen S Cheung
BACKGROUND: Acute exercise performance can be limited by arterial hypoxemia, such that hyperoxia may be an ergogenic aid by increasing tissue oxygen availability. Hyperoxia during a single bout of exercise performance has been examined using many test modalities, including time trials (TTs), time to exhaustion (TTE), graded exercise tests (GXTs), and dynamic muscle function tests. Hyperoxia has also been used as a long-term training stimulus or a recovery intervention between bouts of exercise...
October 3, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28877225/effect-of-water-based-recovery-on-blood-lactate-removal-after-high-intensity-exercise
#6
RANDOMIZED CONTROLLED TRIAL
Francesco Lucertini, Marco Gervasi, Giancarlo D'Amen, Davide Sisti, Marco Bruno Luigi Rocchi, Vilberto Stocchi, Piero Benelli
This study assessed the effectiveness of water immersion to the shoulders in enhancing blood lactate removal during active and passive recovery after short-duration high-intensity exercise. Seventeen cyclists underwent active water- and land-based recoveries and passive water and land-based recoveries. The recovery conditions lasted 31 minutes each and started after the identification of each cyclist's blood lactate accumulation peak, induced by a 30-second all-out sprint on a cycle ergometer. Active recoveries were performed on a cycle ergometer at 70% of the oxygen consumption corresponding to the lactate threshold (the control for the intensity was oxygen consumption), while passive recoveries were performed with subjects at rest and seated on the cycle ergometer...
2017: PloS One
https://www.readbyqxmd.com/read/28840546/obstructive-sleep-apnea-does-not-impair-cardiorespiratory-responses-to-progressive-exercise-performed-until-exhaustion-in-hypertensive-elderly
#7
Bruno Teixeira Barbosa, Amilton da Cruz Santos, Murillo Frazão, Tulio Rocha Petrucci, Gabriel Grizzo Cucato, Adriana Oliveira Sarmento, Eduardo D S Freitas, Anna Myrna Jaguaribe de Lima, Maria do Socorro Brasileiro-Santos
BACKGROUND: Elderly people have a high prevalence to systemic arterial hypertension (SAH) and obstructive sleep apnea (OSA). Both comorbidities are closely associated and inflict damage on cardiorespiratory capacity. METHODS: In order to assess cardiorespiratory responses to the cardiopulmonary exercise test (CPET) among hypertensive elderly with OSA, we enrolled 28 subjects into two different groups: without OSA (No-OSA: apnea/hypopnea index (AHI) < 5 events/h; n = 15) and with OSA (OSA: AHI ≥ 15 events/h; n = 13)...
August 24, 2017: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/28837421/comparison-of-different-volumes-of-high-intensity-interval-training-on-cardiac-autonomic-function-in-sedentary-young-women
#8
Pooja Bhati, Vishal Bansal, Jamal Ali Moiz
Purpose The present study was conducted to compare the effects of low volume of high intensity interval training (LVHIIT) and high volume of high intensity interval training (HVHIIT) on heart rate variability (HRV) as a primary outcome measure, and on maximum oxygen consumption (VO2max), body composition, and lower limb muscle strength as secondary outcome measures, in sedentary young women. Methods Thirty-six participants were recruited in this study. The LVHIIT group (n = 17) performed one 4-min bout of treadmill running at 85%-95% maximum heart rate (HRmax), followed by 3 min of recovery by running at 70% HRmax, three times per week for 6 weeks...
August 24, 2017: International Journal of Adolescent Medicine and Health
https://www.readbyqxmd.com/read/28753496/modelling-oxygen-transfer-using-dynamic-alpha-factors
#9
Lu-Man Jiang, Manel Garrido-Baserba, Daniel Nolasco, Ahmed Al-Omari, Haydee DeClippeleir, Sudhir Murthy, Diego Rosso
Due to the importance of wastewater aeration in meeting treatment requirements and due to its elevated energy intensity, it is important to describe the real nature of an aeration system to improve design and specification, performance prediction, energy consumption, and process sustainability. Because organic loadings drive aeration efficiency to its lowest value when the oxygen demand (energy) is the highest, the implications of considering their dynamic nature on energy costs are of utmost importance. A dynamic model aimed at identifying conservation opportunities is presented...
November 1, 2017: Water Research
https://www.readbyqxmd.com/read/28689985/oxygen-consumption-and-carbon-dioxide-recovery-kinetics-in-the-prediction-of-coronary-artery-disease-severity-and-outcome
#10
Dejana Popovic, Dejana Martic, Tea Djordjevic, Vesna Pesic, Marco Guazzi, Jonathan Myers, Reza Mohebi, Ross Arena
BACKGROUND: Revascularization appears to be beneficial only in patients with high levels of ischemia. This study examined the utility of gas analysis during the recovery phase of cardiopulmonary exercise testing (CPET) in predicting coronary artery disease (CAD) severity and prognosis. METHODS: 40 Caucasian patients (21.2% females), mean age 63.5±7.6 with significant coronary artery lesions (≥50%) were studied. Within two months of coronary angiography, CPET on a treadmill (TM) and recumbent ergometer (RE) were performed on two visits 2-4days apart; subjects were subsequently followed 32±10months...
December 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28683386/efficient-conversion-of-hubrid-pennisetum-to-glucose-by-oxygen-aqueous-alkaline-ionic-liquid-media-pretreatment-under-benign-conditions
#11
Shengdan Wang, Jiachuan Chen, Guihua Yang, Wenhua Gao, Kefu Chen
To enhance the cellulose digestibility of energy grass hybrid Pennisetum (P. americanum×P. purpureum, HP) with low energy-consumption and high efficiency, a novel combinatorial pretreatment of oxygen-aqueous alkaline ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([Emim]Ac) media (OEA) was developed in this work. The combinatorial pretreatment was performed under the relatively low temperature (120°C), short retention time (30min), and 12bar oxygen pressure. The combinatorial pretreatment of OEA was demonstrated effectively for pretreatment of hybrid Pennisetum, which evidenced by the removal of lignin, degradation of carbohydrate, and porosity property of the regenerated biomass...
November 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28658266/post-exercise-hypotension-and-heart-rate-variability-response-after-water-and-land-ergometry-exercise-in-hypertensive-patients
#12
Danilo Sales Bocalini, Marco Bergamin, Alexandre Lopes Evangelista, Roberta Luksevicius Rica, Francisco Luciano Pontes, Aylton Figueira, Andrey Jorge Serra, Emilly Martinelli Rossi, Paulo José Ferreira Tucci, Leonardo Dos Santos
BACKGROUND: systemic arterial hypertension is the most prevalent cardiovascular disease; physical activity for hypertensive patients is related to several beneficial cardiovascular adaptations. This paper evaluated the effect of water- and land-ergometry exercise sessions on post-exercise hypotension (PEH) of healthy normotensive subjects versus treated or untreated hypertensive patients. METHODS: Forty-five older women composed three experimental groups: normotensive (N, n = 10), treated hypertensive (TH, n = 15) and untreated hypertensive (UH, n = 20)...
2017: PloS One
https://www.readbyqxmd.com/read/28642717/the-lactate-minimum-test-concept-methodological-aspects-and-insights-for-future-investigations-in-human-and-animal-models
#13
REVIEW
Leonardo H D Messias, Claudio A Gobatto, Wladimir R Beck, Fúlvia B Manchado-Gobatto
In 1993, Uwe Tegtbur proposed a useful physiological protocol named the lactate minimum test (LMT). This test consists of three distinct phases. Firstly, subjects must perform high intensity efforts to induce hyperlactatemia (phase 1). Subsequently, 8 min of recovery are allowed for transposition of lactate from myocytes (for instance) to the bloodstream (phase 2). Right after the recovery, subjects are submitted to an incremental test until exhaustion (phase 3). The blood lactate concentration is expected to fall during the first stages of the incremental test and as the intensity increases in subsequent stages, to rise again forming a "U" shaped blood lactate kinetic...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28601340/pilot-scale-evaluation-of-semi-passive-treatment-technologies-for-the-treatment-of-septage-under-temperate-climate-conditions
#14
Christine Gan, Pascale Champagne, Geof Hall
Population growth in rural Canada has resulted in an increase in municipal septage generation, which could overload existing treatment facilities that rely on biological treatment approaches. To address concerns associated with potential shock loading of these systems, three semi-passive wastewater treatment technologies were compared at the pilot-scale to identify a suitable approach to augment the capacity of an existing wastewater stabilization pond facility in rural Ontario. Two of these technologies, the BioDome and BioCord systems, were commercially available systems that make use of biofilm technology to improve treatment performance and enhance the robustness to temperature and hydraulic loading fluctuations...
June 7, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28582899/effect-of-whole-body-vibration-on-lactate-level-recovery-and-heart-rate-recovery-in-rest-after-intense-exercise
#15
Seung Rok Kang, Jin-Young Min, Changho Yu, Tae-Kyu Kwon
OBJECTIVE: In this paper, we investigated the recovery of the lactate level, muscular fatigue, and heart rate recovery (HRR) with respect to whole body vibration (WBV) during the rest stage after a gait exercise. METHODS: A total of 24 healthy subjects with no medical history of exercise injury participated. The participants were divided into a training group with vibration during rest and a control group with the same conditions but without vibration. The subjects performed a gait exercise with a slope of 15% and velocity of 4 km/h to consume 450 kcal in 30 min...
July 20, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
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
#16
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
#17
Natalya J Beer, James A Dimmock, Ben Jackson, Kym J Guelfi
The benefits of regular exercise for health are well established; however, certain behaviors after 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, 22.9 ± 2...
October 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
#18
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...
June 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
#19
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...
July 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
#20
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
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