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Recovery oxygen consumption in performance

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https://www.readbyqxmd.com/read/29326904/effects-of-habitual-smoking-on-cardiopulmonary-function-in-taekwondo-athletes
#1
Dong-Jin Jang, Hee-Cheol Kim, Jae-Kyung Kim, Sun-Young Jung, Dae-Young Kim
This study aimed to verify habitual smoking effects on cardiopulmonary function in taekwondo athletes. Subjects were university taekwondo athletes aged 20-24 years in nonsmoker (n= 9) and smoker (n= 6) groups. Subjects underwent an exercise examination for their ventilation threshold, minute ventilation, oxygen uptake, maximum volume of minute oxygen consumption, heart rate, and oxygen pulse during exercise and 1, 3, and 5 min after maximum exercise. The time of reaching the ventilation threshold was significantly higher in nonsmokers than in smokers...
December 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29324474/active-and-inactive-leg-hemodynamics-during-sequential-single-leg-interval-cycling
#2
Nicole Gordon, Chris R Abbiss, Mohammed Ihsan, Andrew J Maiorana, Jeremiah J Peiffer
INTRODUCTION: Leg order during sequential single-leg cycling (i.e. exercising both legs independently within a single session) may affect local muscular responses potentially influencing adaptations. This study examined the cardiovascular and skeletal muscle hemodynamic responses during double-leg and sequential single-leg cycling. METHODS: Ten young healthy adults (28 ± 6 y) completed six 1-min double-leg intervals interspersed with one minute of passive recovery and, on a separate occasion, 12 (six with one leg followed by six with the other leg) 1-min single-leg intervals interspersed with one minute of passive recovery...
January 11, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29290363/flavanol-rich-cocoa-consumption-enhances-exercise-induced-executive-function-improvements-in-humans
#3
Hayato Tsukamoto, Tadashi Suga, Aya Ishibashi, Saki Takenaka, Daichi Tanaka, Yoshitaka Hirano, Takafumi Hamaoka, Kazushige Goto, Kumiko Ebi, Tadao Isaka, Takeshi Hashimoto
OBJECTIVE: Aerobic exercise is known to acutely improve cognitive functions, such as executive function (EF) and memory function (MF). Additionally, consumption of flavanol-rich cocoa has been reported to acutely improve cognitive function. The aim of this study was to determine whether high cocoa flavanol (CF; HCF) consumption would enhance exercise-induced improvement in cognitive function. To test this hypothesis, we examined the combined effects of HCF consumption and moderate-intensity exercise on EF and MF during postexercise recovery...
February 2018: Nutrition
https://www.readbyqxmd.com/read/29286508/tissue-breathing-and-topology-of-rats-thymocytes-surface-under-acute-total-%C3%AE-irradiation
#4
I A Nikitina, A I Gritsuk
OBJECTIVE: Assessment of the effect of single total γ irradiation to the parameters of mitochondrial oxidation and the topology of the thymocyte surface. MATERIALS AND METHODS: The study was performed in sexually mature white outbreeding male rats divided into three groups: two experimental and one control. The states of energy metabolism were determined by the rate of oxygen consumption by the thymus tissues on endogenous substrates at the presence of 2,4 dinitrophenol, uncoupler of a tissue breathing (TB) and oxidative phosphorylation (OP) after a single total γ irradiation at a dose of 1...
December 2017: Problemy Radiat︠s︡iĭnoï Medyt︠s︡yny Ta Radiobiolohiï
https://www.readbyqxmd.com/read/29261437/recovery-responses-to-maximal-exercise-in-healthy-weight-children-and-children-with-obesity
#5
Elizabeth A Easley, W Scott Black, Alison L Bailey, Terry A Lennie, Wilma J Sims, Jody L Clasey
PURPOSE: The purpose of this study was to examine differences in heart rate recovery (HRRec) and oxygen consumption recovery (VO2 recovery) between young healthy-weight children and children with obesity following a maximal volitional graded exercise test (GXTmax). METHOD: Twenty healthy-weight children and 13 children with obesity completed body composition testing and performed a GXTmax. Immediately after the GXTmax, HRRec and VO2 recovery were measured each minute for 5 consecutive minutes...
December 20, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/29250845/fitness-related-differences-in-the-rate-of-whole-body-total-heat-loss-in-exercising-young-healthy-women-are-heat-load-dependent
#6
Dallon T Lamarche, Sean R Notley, Martin P Poirier, Glen P Kenny
Aerobic fitness has recently been shown to alter heat loss capacity in a heat-load dependent manner in young men. However, given that sex-related differences in heat loss capacity exist, it is unclear if this response is consistent in women. We therefore assessed whole-body total heat loss in young (21 ± 3 years) healthy women matched for physical characteristics, but with low (Low-fit) (35.8 ± 4.5 mLO2 ·kg-1 ·min-1 ) and high (High-fit) (53.1 ± 5.1 mLO2 ·kg-1 ·min-1 ) (both n = 8) aerobic fitness (indexed by peak oxygen consumption (V̇O2peak )), during three 30-min bouts of cycling performed at increasing rates of metabolic heat production of 250 W (Ex1), 325 W (Ex2), and 400 W (Ex3), each separated by a 15-min recovery, in hot, dry conditions (40°C, 11% relative humidity)...
December 18, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29190751/acute-effect-of-dietary-nitrate-on-forearm-muscle-oxygenation-blood-volume-and-strength-in-older-adults-a-randomized-clinical-trial
#7
Gustavo Vieira de Oliveira, Marina Morgado, Carlos Adam Conte-Junior, Thiago Silveira Alvares
Both recovery time of post-exercise muscle oxygenation and muscle strength decline with aging. Although beetroot consumption has been shown to improve muscle oxygenation and exercise performance in adults, these effects in the elderly has not been addressed. The aim of the present study was to evaluate the effect of a beetroot-based gel (BG) on muscle O2 saturation, blood volume (tHb) and handgrip strength in the elderly in response to handgrip exercise. In a randomized crossover double-blind design, twelve older subjects consumed BG (100 g of beetroot-based gel containing ~ 12 mmol nitrate) or PLA (100 g of nitrate-depleted gel nitrate-depleted)...
2017: PloS One
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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