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Ventilatory threshold

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https://www.readbyqxmd.com/read/28303944/relationships-between-strength-and-endurance-parameters-and-air-depletion-rates-in-professional-firefighters
#1
Stephanie Windisch, Wolfgang Seiberl, Ansgar Schwirtz, Daniel Hahn
The aim of this study was to quantify the physical demands of a simulated firefighting circuit and to establish the relationship between job performance and endurance and strength fitness measurements. On four separate days 41 professional firefighters (39 ± 9 yr, 179.6 ± 2.3 cm, 84.4 ± 9.2 kg, BMI 26.1 ± 2.8 kg/m(2)) performed treadmill testing, fitness testing (strength, balance and flexibility) and a simulated firefighting exercise. The firefighting exercise included ladder climbing (20 m), treadmill walking (200 m), pulling a wire rope hoist (15 times) and crawling an orientation section (50 m)...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28299717/physical-activity-and-maximal-oxygen-uptake-in-adults-with-prader-willi-syndrome
#2
Itai Gross, Harry J Hirsch, Naama Constantini, Shachar Nice, Yehuda Pollak, Larry Genstil, Talia Eldar-Geva, Varda Gross Tsur
BACKGROUND: Prader-Willi Syndrome (PWS) is the most common genetic syndrome causing life-threatening obesity. Strict adherence to a low-calorie diet and regular physical activity are needed to prevent weight gain. Direct measurement of maximal oxygen uptake (VO2 max), the "gold standard" for assessing aerobic exercise capacity, has not been previously described in PWS. OBJECTIVES: Assess aerobic capacity by direct measurement of VO2 max in adults with PWS, and in age and BMI-matched controls (OC), and compare the results with values obtained by indirect prediction methods...
March 16, 2017: Eating and Weight Disorders: EWD
https://www.readbyqxmd.com/read/28288012/influence-of-upper-body-exercise-on-the-fatigability-of-human-respiratory-muscles
#3
Nicholas B Tiller, Ian G Campbell, Lee M Romer
PURPOSE: Diaphragm and abdominal muscles are susceptible to contractile fatigue in response to high-intensity, whole-body exercise. This study assessed whether the ventilatory and mechanical loads imposed by high-intensity, upper-body exercise would be sufficient to elicit respiratory muscle fatigue. METHODS: Seven healthy men (mean±SD: age 24±4 y; peak O2 uptake [V[Combining Dot Above]O2 peak] 31.9±5.3 ml/kg/min) performed asynchronous arm-crank exercise to exhaustion at work rates equivalent to 30% (heavy) and 60% (severe) of the difference between gas-exchange threshold and V[Combining Dot Above]O2 peak...
March 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28271801/pediatric-aerobic-fitness-and-trainability
#4
Neil Armstrong
Three papers which between them raise controversial issues, apply laboratory measures to sport performance, and expose gaps in knowledge were selected for commentary. The first paper (Sports Med. 2016;46:1451-1460) reviews the literature on peak V̇O2 in relation to body size and recommends that peak V̇O2 in youth is best expressed via allometric scaling of lean body mass. The second paper (Pediatr Exerc Sci. 2016;28:456-465) reports that maturity status has no effect on peak V̇O2, respiratory compensation point, or ventilatory threshold in youth soccer players once data have been allometrically normalized by lower limb muscle volume...
February 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28246499/energy-systems-efficiency-influences-the-results-of-2-000-m-race-simulation-among-elite-rowers
#5
Stefan Adrian Martin, Valeriu Tomescu
HYPOTHESIS: Energy efficiency within an elite group of athletes will ensure metabolic adaptation during training. OBJECTIVES: To identify energy system efficiency and contribution according to exercise intensity, and performance obtained during a 2,000 m race simulation in an elite group of rowers. METHOD: An observational cross-sectional study was conducted in February 2016 in Bucharest, Romania, on a group of 16 elite rowers. Measurements were performed through Cosmed Quark CPET equipment, and Concept 2 ergometer, by conducting a VO2max test over a standard rowing distance of 2,000 m...
2017: Clujul Medical (1957)
https://www.readbyqxmd.com/read/28242825/impact-of-type-2-diabetes-on-cardiorespiratory-function-and-exercise-performance
#6
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/28240707/comparison-of-different-methods-for-the-swimming-aerobic-capacity-evaluation
#7
Jailton Gregório Pelarigo, Ricardo Jorge Fernandes, João Ribeiro, Benedito Sérgio Denadai, Camila Coelho Greco, João Paulo Vilas-Boas
This study compared velocity (v) and bioenergetical factors using different methods applied for the swimming aerobic capacity evaluation. Ten elite female swimmers (17.6 ± 1.9 yrs., 1.70 ± 0.05 m and 61.3 ± 5.8 kg) performed an intermittent incremental velocity protocol until voluntary exhaustion to determine the v associated to the individual anaerobic threshold (IAnT), ventilatory threshold (VT), heart rate threshold (HRT), lactate threshold fixed in 3.5 mmol.L (LT3.5) and maximal oxygen uptake (V[Combining Dot Above]O2max)...
February 23, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28235695/the-differential-effects-of-prolonged-exercise-upon-executive-function-and-cerebral-oxygenation
#8
Gavin D Tempest, Karen Davranche, Jeanick Brisswalter, Stephane Perrey, Rémi Radel
The acute-exercise effects upon cognitive functions are varied and dependent upon exercise duration and intensity, and the type of cognitive tasks assessed. The hypofrontality hypothesis assumes that prolonged exercise, at physiologically challenging intensities, is detrimental to executive functions due to cerebral perturbations (indicated by reduced prefrontal activity). The present study aimed to test this hypothesis by measuring oxygenation in prefrontal and motor regions using near-infrared spectroscopy during two executive tasks (flanker task and 2-back task) performed while cycling for 60min at a very low intensity and an intensity above the ventilatory threshold...
April 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28209387/associations-of-cardiovascular-and-all-cause-mortality-events-with-oxygen-uptake-at-ventilatory-threshold
#9
Setor K Kunutsor, Sudhir Kurl, Hassan Khan, Francesco Zaccardi, Jari A Laukkanen
BACKGROUND: Oxygen uptake (VO2) at ventilatory threshold (VT), is a cardiopulmonary exercise testing parameter which may be a proxy for peak VO2. We aimed to assess the associations of VO2 at VT with sudden cardiac death (SCD), fatal coronary heart disease (CHD) and cardiovascular disease (CVD), and all-cause mortality. METHODS AND RESULTS: VO2 at VT was assessed during a submaximal exercise test using respiratory gas analyzers in the Kuopio Ischemic Heart Disease cohort of 1639 middle-aged men...
February 10, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28159512/effect-of-calcium-channel-blockers-evaluated-by-cardiopulmonary-exercise-testing-in-idiopathic-pulmonary-arterial-hypertension-responding-to-acute-pulmonary-vasoreactivity-testing
#10
Yi Tang, Lei Yao, Zhihong Liu, Xiuping Ma, Qin Luo, Zhihui Zhao, Zhiwei Huang, Laura Tu, Liu Gao, Qi Jin, Xinhai Ni, Changming Xiong
BACKGROUND: The baseline exercise capacity evaluated by cardiopulmonary exercise testing (CPET) and the change after administration of calcium channel blockers (CCB) therapy in patients with vasodilator-responsive idiopathic pulmonary arterial hypertension (VR-IPAH)are unknown. METHODS: 25 patients with newly diagnosed VR-IPAH from 1 January 2012 to 16 November 2015 were prospectively enrolled, and 28 age, sex and pulmonary vascular resistance matched newly diagnosed patients with vasodilator-nonresponsive idiopathic pulmonary arterial hypertension (VNR-IPAH) were enrolled...
January 31, 2017: Pulmonary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28153942/divergent-endothelial-function-but-similar-platelet-microvesicle-responses-following-eccentric-and-concentric-cycling-at-a-similar-aerobic-power-output
#11
Mark Rakobowchuk, Ophélie Ritter, Eurico Nestor Wilhelm, Laurie Isacco, Malika Bouhaddi, Bruno Degano, Nicolas Tordi, Laurent Mourot
Endothelial function and microvesicle concentration changes after acute bouts of continuous eccentric exercise have not been assessed previously nor compared to concentric exercise at similar aerobic power outputs. This method of training may be useful amongst some clinical populations, but acute responses are not well described. As such, twelve healthy males completed two experimental sessions of either 45 minutes of eccentric or concentric cycling at a matched aerobic power output below the ventilatory threshold...
February 2, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28153938/exertional-dyspnea-associated-with-chest-wall-strapping-is-reduced-when-external-dead-space-substitutes-for-part-of-the-exercise-stimulus-to-ventilation
#12
Luke Albert Garske, Ravin Lal, Ian Braidwood Stewart, Norman R Morris, Troy James Cross, Lewis Adams
Chest wall strapping has been used to assess mechanisms of dyspnea with restrictive lung disease. This study examined the hypothesis that dyspnea with restriction depends principally on the degree of reflex ventilatory stimulation. We compared dyspnea at the same (iso-)ventilation when added dead space provided a component of the ventilatory stimulus during constant work exercise. Eleven healthy males undertook a randomized controlled cross-over trial which compared four constant work exercise conditions (i) CTRL: unrestricted breathing at 90% Gas Exchange Threshold (GET), (ii) CTRL+DS: unrestricted breathing with 0...
February 2, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28150178/the-effect-of-concurrent-plyometric-training-versus-submaximal-aerobic-cycling-on-rowing-economy-peak-power-and-performance-in-male-high-school-rowers
#13
Julian D Egan-Shuttler, Rohan Edmonds, Cassandra Eddy, Veronica O'Neill, Stephen J Ives
BACKGROUND: Plyometric training has been shown to increase muscle power, running economy, and performance in athletes. Despite its use by rowing coaches, it is unknown whether plyometrics might improve rowing economy or performance. The purpose was to determine if plyometric training, in conjunction with training on the water, would lead to improved rowing economy and performance. METHODS: Eighteen male high school rowers were assigned to perform 4 weeks of either plyometric training (PLYO, n = 9) or steady-state cycling below ventilatory threshold (endurance, E, n = 9), for 30 min prior to practice on the water (matched for training volume) 3 days per week...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28149422/comparison-of-oxygen-uptake-during-and-after-the-execution-of-resistance-exercises-and-exercises-performed-on-ergometers-matched-for-intensity
#14
José Vilaça-Alves, Nuno Miguel Freitas, Francisco José Saavedra, Christopher B Scott, Victor Machado Dos Reis, Roberto Simão, Nuno Garrido
The aim of this study was to compare the values of oxygen uptake (VO2) during and after strength training exercises (STe) and ergometer exercises (Ee), matched for intensity and exercise time. Eight men (24 ± 2.33 years) performed upper and lower body cycling Ee at the individual's ventilatory threshold (VE/VCO2). The STe session included half squats and the bench press which were performed with a load at the individual blood lactate concentration of 4 mmol/l. Both sessions lasted 30 minutes, alternating 50 seconds of effort with a 10 second transition time between upper and lower body work...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149350/the-influence-of-high-altitude-acclimatization-on-ventilatory-and-blood-oxygen-saturation-responses-during-normoxic-and-hypoxic-testing
#15
Anton Ušaj, Stojan Burnik
We investigated how acclimatization effects achieved during a high-altitude alpinist expedition influence endurance performance, ventilation ([Formula: see text]) and blood oxygen saturation (SaO2) in normoxic (NOR) and hypoxic conditions (HYP). An incremental testing protocol on a cycle ergometer was used to determine the power output corresponding to the Lactate (PLT) and Ventilatory Threshold (PVT) in NOR and HYP (FiO2=0.13) as indirect characteristics of endurance performance in both conditions. Furthermore, changes in [Formula: see text], SaO2, blood pH and Pco2 were measured at a similar absolute exercise intensity of 180 W in NOR and HYP conditions...
April 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28090142/the-midpoint-between-ventilatory-thresholds-approaches-maximal-lactate-steady-state-intensity-in-amateur-cyclists
#16
A B Peinado, Dm Pessôa Filho, V Díaz, P J Benito, M Álvarez-Sánchez, A G Zapico, F J Calderón
The aim was to determine whether the midpoint between ventilatory thresholds (MPVT) corresponds to maximal lactate steady state (MLSS). Twelve amateur cyclists (21.0 ± 2.6 years old; 72.2 ± 9.0 kg; 179.8 ± 7.5 cm) performed an incremental test (25 W·min(-1)) until exhaustion and several constant load tests of 30 minutes to determine MLSS, on different occasions. Using MLSS determination as the reference method, the agreement with five other parameters (MPVT; first and second ventilatory thresholds: VT1 and VT2; respiratory exchange ratio equal to 1: RER = 1...
December 2016: Biology of Sport
https://www.readbyqxmd.com/read/28079704/modeling-perceived-exertion-during-graded-arm-cycling-exercise-in-spinal-cord-injury
#17
Jason S Au, Julia O Totosy de Zepetnek, Maureen J MacDonald
PURPOSE: Ratings of perceived exertion (RPE) may be useful for exercise testing and prescription in individuals with spinal cord injury (SCI), though the roles of differentiated central and peripheral fatigue during exercise are not clear. We aimed to model differentiated RPE responses during graded arm cycling in individuals with SCI and describe their relationship to cardiorespiratory outcomes. METHODS: Thirty-six individuals with SCI (13 paraplegia; 23 tetraplegia) completed a maximal graded-arm cycling exercise test to volitional exhaustion (5W/min paraplegia; 10W/min tetraplegia)...
January 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28072848/physiologic-determinants-of-exercise-capacity-in-pulmonary-langerhans-cell-histiocytosis-a-multidimensional-analysis
#18
Camille Rolland-Debord, Stephanie Fry, Jonathan Giovannelli, Carole Langlois, Nicolas Bricout, Bernard Aguilaniu, Agnes Bellocq, Olivier Le Rouzic, Stephane Dominique, Alain Delobbe, Geraldine François, Abdellatif Tazi, Benoit Wallaert, Cecile Chenivesse
BACKGROUND: Reduced exercise capacity severely impacts quality of life in pulmonary Langerhans cell histiocytosis. Ascertaining mechanisms that impair exercise capacity is necessary to identify targets for symptomatic treatments. METHODS: Dyspnea, pulmonary function tests and cardiopulmonary exercise test were analysed in 62 study participants. Data were compared between subjects with impaired and normal aerobic capacity (V'O2 peak less than 84% versus 84% predicted or more)...
2017: PloS One
https://www.readbyqxmd.com/read/28038810/lvad-pump-speed-increase-is-associated-with-increased-peak-exercise-cardiac-output-and-vo2-postponed-anaerobic-threshold-and-improved-ventilatory-efficiency
#19
Carlo Vignati, Anna Apostolo, Gaia Cattadori, Stefania Farina, Alberico Del Torto, Silvia Scuri, Gino Gerosa, Tomaso Bottio, Vincenzo Tarzia, Jonida Bejko, Erminio Sisillo, Flavia Nicoli, Susanna Sciomer, Francesco Alamanni, Stefania Paolillo, Piergiuseppe Agostoni
BACKGROUNDS: Peak exercise cardiac output (CO) increase is associated with an increase of peak oxygen uptake (VO2), provided that arteriovenous O2 difference [Δ(Ca-Cv)O2] does not decrease. At anaerobic threshold, VO2, is related to CO. We tested the hypothesis that, in heart failure (HF) patients with left ventricular assistance device (LVAD), an acute increase of CO obtained through changes in LVAD pump speed is associated with peak exercise and anaerobic threshold VO2 increase. METHODS: Fifteen of 20 patients bearing LVAD (Jarvik 2000) enrolled in the study successfully performed peak exercise evaluation...
March 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/27993169/the-incidence-of-training-responsiveness-to-cardiorespiratory-fitness-and-cardiometabolic-measurements-following-individualized-and-standardized-exercise-prescription-study-protocol-for-a-randomized-controlled-trial
#20
Ryan M Weatherwax, Nigel K Harris, Andrew E Kilding, Lance C Dalleck
BACKGROUND: There is individual variability to cardiorespiratory fitness (CRF) training, but the underlying cause is not well understood. Traditionally, a standardized approach to exercise prescription has utilized relative percentages of maximal heart rate, heart rate reserve (HRR), maximal oxygen uptake (VO2max), or VO2 reserve to establish exercise intensity. However, this model fails to take into consideration individual metabolic responses to exercise and may attribute to the variability in training responses...
December 19, 2016: Trials
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