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Ventilatory threshold

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https://www.readbyqxmd.com/read/28209387/associations-of-cardiovascular-and-all-cause-mortality-events-with-oxygen-uptake-at-ventilatory-threshold
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
https://www.readbyqxmd.com/read/27991804/what-to-expect-when-you-re-exercising-an-experimental-test-of-the-anticipated-affect-exercise-relationship
#13
Bethany M Kwan, Courtney J Stevens, Angela D Bryan
OBJECTIVE: Anticipated affect may influence exercise behavior via experienced affective responses and intentions. Cognitive manipulations of anticipated affect may inform exercise intervention design. The purpose of this study was to experimentally test the effects of an expectation-based manipulation of affective responses to exercise on anticipated, experienced, and remembered affect and adherence to a 7-day exercise prescription. METHOD: Participants (N = 98) were randomly assigned to a positive anticipated affect manipulation, a negative anticipated affect manipulation, or a no affect manipulation control...
December 19, 2016: Health Psychology: Official Journal of the Division of Health Psychology, American Psychological Association
https://www.readbyqxmd.com/read/27942152/the-temporal-relationship-of-thresholds-between-muscle-activity-and-ventilation-during-bicycle-ramp-exercise-in-community-dwelling-elderly-males
#14
Kentaro Sasaki, Tsuyoshi Kimura, Satoshi Kojima, Hiroyuki Higuchi
[Purpose] To compare the appearance time of the ventilatory threshold point and the electromyographic threshold in the activity of the vastus lateralis, rectus femoris, biceps femoris long head and gastrocnemius lateral head muscles during ramp cycling exercise in elderly males. [Subjects and Methods] Eleven community dwelling elderly males participated in this study. Subjects performed exercise testing with an expiratory gas analyzer and surface electromyography to evaluate the tested muscle activities during ramp exercise...
November 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27940335/comparison-between-the-kansas-city-cardiomyopathy-questionnaire-and-nyha-in-assessing-functional-capacity-and-clinical-outcomes
#15
Nael Hawwa, Amanda R Vest, Rahul Kumar, Rony Lahoud, James B Young, Yuping Wu, Eiran Z Gorodeski, Leslie S Cho
AIMS: The Kansas City Cardiomyopathy Questionnaire (KCCQ) has emerged as a patient-centered, heart failure-specific health status measure. It currently lacks routine and widespread use in clinical practice or trials. The purpose of this study was to examine the correlation between KCCQ and cardiopulmonary exercise testing (CPET) parameters and clinical outcomes, in comparison with the New York Heart Association (NYHA) functional classification. METHODS AND RESULTS: We performed a single-centered, observational analysis of 432 patients who presented to the Heart Failure Department, completed the KCCQ, and underwent CPET...
December 8, 2016: Journal of Cardiac Failure
https://www.readbyqxmd.com/read/27928204/a-feasibility-study-related-to-inactive-cancer-survivors-compared-with-non-cancer-controls-during-aerobic-exercise-training
#16
Scott N Drum, Riggs J Klika, Susan D Carter, Lisa K Sprod, Lars Donath
Cancer survivors (CA) tend to demonstrate metabolic, cardiac, and ventilatory alterations due to previous chemotherapy and radiation that may impair adaptability following aerobic exercise training. Exercise training adaptations of CA finished with primary treatment compared to non-cancer participants (NC) have not yet been extensively elucidated. Thus, the present study compared physiologic responses of CA versus NC following a low-to-moderate intensity, 8-wk aerobic training program. Thirty-seven previously sedentary participants (CA: n = 14, 12 females; NC: n = 23, 19 females) with no heart or metabolic disease did not differ in age, height, weight, and body mass index (51 ± 2 y, 1...
December 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27927660/effect-of-prehabilitation-in-gastro-oesophageal-adenocarcinoma-study-protocol-of-a-multicentric-randomised-control-trial-the-prehab-study
#17
Bertrand Le Roy, Bruno Pereira, Corinne Bouteloup, Frédéric Costes, Ruddy Richard, Marie Selvy, Caroline Pétorin, Johan Gagnière, Emmanuel Futier, Karem Slim, Bernard Meunier, Jean-Yves Mabrut, Christophe Mariette, Denis Pezet
INTRODUCTION: Perioperative chemotherapy is the gold standard treatment of the resectable gastro-oesophageal adenocarcinoma. However, 70% of patients cannot receive the complete sequence because of a postoperative complication or a decrease in functional and nutritional reserves. Recently, a new concept appeared in digestive surgery: prehabilitation. This interventional process consists of patient preparation, between surgical consultation and surgery, and is based on 3 components: (1) physical management, (2) nutritional care and (3) psychological care...
December 7, 2016: BMJ Open
https://www.readbyqxmd.com/read/27915207/fixed-distance-walk-tests-at-comfortable-and-fast-speed-potential-tools-for-the-functional-assessment-of-coronary-patients
#18
Marie-Doriane Morard, Delphine Besson, Davy Laroche, Alexandre Naaïm, Vincent Gremeaux, Jean-Marie Casillas
OBJECTIVES: There is ambiguity concerning the walk tests available for functional assessment of coronary patients, particularly for the walking speed. This study explores the psychometric properties of two walking tests, based on fixed-distance tests, at comfortable and fast velocity, in stabilized patients at the end of a cardiac rehabilitation program. METHODS: At a three-day interval 58 coronary patients (mean age of 64.85±6.03 years, 50 men) performed three walk tests, the first two at a comfortable speed in a random order (6-minute walk test - 6MWT - and 400-metre comfortable walk test - 400mCWT) and the third at a brisk speed (200-metre fast walk test - 200mFWT)...
November 30, 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27884421/interpreting-the-incremental-cardiopulmonary-exercise-test
#19
REVIEW
Samir Nusair
The incremental cardiopulmonary exercise test (CPET) is an increasingly used diagnostic method that serves to evaluate patients with chief complaint of dyspnea during exercise. Performing maximal symptom-limited CPET can show if the tested subject has a reduced exercise capacity and give clues to the mechanism of such exercise capacity reduction, cardiac, pulmonary, or pulmonary vascular source. In this review, it is suggested that the evaluation of the complex results of CPET should be performed by first determining if myocardial/circulatory insufficiency is present and second if there is gas exchange abnormality...
February 1, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/27875410/should-we-use-driving-pressure-to-set-tidal-volume
#20
Domenico L Grieco, Lu Chen, Martin Dres, Laurent Brochard
PURPOSE OF REVIEW: Ventilator-induced lung injury (VILI) can occur despite use of tidal volume (VT) limited to 6 ml/kg of predicted body weight, especially in patients with a smaller aerated compartment (i.e. the baby lung) in which, indeed, tidal ventilation takes place. Because respiratory system static compliance (CRS) is mostly affected by the volume of the baby lung, the ratio VT/CRS (i.e. the driving pressure, ΔP) may potentially help tailoring interventions on VT setting. RECENT FINDINGS: Driving pressure is the ventilatory variable most strongly associated with changes in survival and has been shown to be the key mediator of the effects of mechanical ventilation on outcome in the acute respiratory distress syndrome...
February 2017: Current Opinion in Critical Care
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