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cardiac output exercise

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https://www.readbyqxmd.com/read/28090146/rapid-weight-loss-in-the-context-of-ramadan-observance-recommendations-for-judokas
#1
REVIEW
A Aloui, H Chtourou, W Briki, M Tabben, A Chaouachi, N Souissi, R J Shephard, K Chamari
Judo is a weight-classified combat sport, and many athletes seek to compete at the lightest possible weight category to gain an advantage from competing against shorter/smaller, and supposedly weaker opponents. To achieve a desired weight, most judokas opt for rapid weight loss techniques. Short-duration maximal efforts are not greatly affected by "making weight", but prolonged and/or repeated exercise is significantly impaired. Negative effects on mood, ratings of perceived exertion, and cognitive function are also reported...
December 2016: Biology of Sport
https://www.readbyqxmd.com/read/28081223/high-intensity-jump-training-is-tolerated-during-60-days-of-bed-rest-and-is-very-effective-in-preserving-leg-power-and-lean-body-mass-an-overview-of-the-cologne-rsl-study
#2
Andreas Kramer, Jakob Kümmel, Edwin Mulder, Albert Gollhofer, Petra Frings-Meuthen, Markus Gruber
PURPOSE: Space agencies are looking for effective and efficient countermeasures for the degrading effects of weightlessness on the human body. The aim of this study was to assess the effects of a novel jump exercise countermeasure during bed rest on vitals, body mass, body composition, and jump performance. METHODS: 23 male participants (29±6 years, 181±6 cm, 77±7 kg) were confined to a bed rest facility for 90 days: a 15-day ambulatory measurement phase, a 60-day six-degree head-down-tilt bed rest phase (HDT), and a 15-day ambulatory recovery phase...
2017: PloS One
https://www.readbyqxmd.com/read/28081200/fitter-women-did-not-have-attenuated-hemodynamic-responses-to-psychological-stress-compared-with-age-matched-women-with-lower-levels-of-fitness
#3
Sisitha U Jayasinghe, Susan J Torres, Mais Hussein, Steve F Fraser, Gavin W Lambert, Anne I Turner
According to the 'cross stressor adaptation hypothesis', regular exercise acts as a buffer against the detrimental effects of stress. Nevertheless, evidence that higher levels of cardiorespiratory fitness moderate hemodynamic responses to acute psychological stress is inconclusive, especially in women. Women aged 30-50 years (in the mid-follicular phase of the menstrual cycle) with higher (n = 17) and lower (n = 17) levels of fitness were subjected to a Trier Social Stress Test (TSST). Continuous, non-invasive measurements were made of beat-to-beat, systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), heart rate (HR), stroke volume (SV), cardiac output (CO), left ventricular ejection time (LVET), maximum slope, pulse interval (PI) and total peripheral resistance (TPR)...
2017: PloS One
https://www.readbyqxmd.com/read/28043677/pressure-volume-loop-derived-cardiac-indices-during-dobutamine-stress-a-step-towards-understanding-limitations-in-cardiac-output-in-children-with-hypoplastic-left-heart-syndrome
#4
James Wong, Kuberan Pushparajah, Adelaide de Vecchi, Bram Ruijsink, Gerald F Greil, Tarique Hussain, Reza Razavi
BACKGROUND: Children with a single systemic right ventricle, such as in hypoplastic left heart syndrome (HLHS), frequently experience reduced exercise capacity. Elucidating the causes could help with optimising treatment strategies. METHODS: Prospective data from 10 consecutive symptomatic patients with HLHS undergoing clinical cardiac magnetic resonance with catheterisation (XMR) were analysed. Mean age 8.6years (range 3.5-11.6years), mean time since Fontan completion 5...
December 22, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/28043202/sex-specific-cardiopulmonary-exercise-testing-indices-related-to-hemodynamics-in-idiopathic-pulmonary-arterial-hypertension
#5
Ping Yuan, Tian-Xiang Chen, Bigyan Pudasaini, Jie Zhang, Jian Guo, Si-Jin Zhang, Lan Wang, Qin-Hua Zhao, Su-Gang Gong, Rong Jiang, Wen-Hui Wu, Jing He, Jin-Ming Liu, Qing-Hua Hu
BACKGROUND: Many studies have highlighted sex preponderance in idiopathic pulmonary arterial hypertension (IPAH). It is well established that there are differences in exercise capacities in the two sexes but how much of that difference reflects on disease severity or correlates to markers of severity in the two sexes is still not clear. Right heart catheterization (RHC) and cardiopulmonary exercise testing (CPET) have been widely used for assessing functional capacity, prognosis and treatment response in IPAH...
January 1, 2017: Therapeutic Advances in Respiratory Disease
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
#6
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...
December 22, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/28026153/clinical-and-hemodynamic-characteristics-of-pulmonary-hypertension-associated-with-interstitial-lung-disease-in-china
#7
Lan Wang, Qin-Hua Zhao, Bigyan Pudasaini, Rong Jiang, Su-Gang Gong, Jing He, Ping Yuan, Jin-Ming Liu
BACKGROUND: Pulmonary hypertension (PH) is an important complication of interstitial lung disease (ILD). The aim of the present study was to investigate characteristics and prognosis of ILD associated PH in a predominantly Chinese patient cohort. METHODS: Consecutive patients with ILD associated PH, confirmed by right heart catheterization at shanghai pulmonary hospital were included in the study. Characteristics at baseline and during follow-up, as well as survival, were analyzed...
December 27, 2016: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/28025832/characterizing-the-sympatholytic-role-of-endothelial-dependent-vasodilator-signalling-during-handgrip-exercise
#8
Iain R Lamb, Nicole M Novielli
The dynamic metabolic range of skeletal muscle necessitates an equally dynamic blood flow requirement, to the point where the demand for skeletal muscle blood flow during intense bouts of large muscle mass exercise can theoretically 'outstrip' the heart's ability to generate the cardiac output necessary for maintaining sufficient mean arterial pressure (MAP) and muscle perfusion. This article is protected by copyright. All rights reserved.
December 26, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/28025026/hyperdynamic-right-heart-function-in-graves-hyperthyroidism-measured-by-echocardiography-normalises-on-restoration-of-euthyroidism
#9
Stephanie L Teasdale, Warrick J Inder, Michael Stowasser, Tony Stanton
BACKGROUND: Graves' hyperthyroidism commonly causes tachycardia and may result in pulmonary hypertension and high output cardiac failure. There is limited information regarding the effect of treatment on cardiac function measured using modern echocardiographic techniques. METHODS: Eight individuals with Graves' hyperthyroidism, aged 22-64 years, underwent comprehensive transthoracic echocardiography at three time points: before treatment, two weeks after commencement of carbimazole, and at six months or more when euthyroid...
November 19, 2016: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28017352/the-influence-of-age-on-hemodynamic-parameters-during-rest-and-exercise-in%C3%A2-healthy-individuals
#10
Emil Wolsk, Rine Bakkestrøm, Jacob H Thomsen, Louise Balling, Mads J Andersen, Jordi S Dahl, Christian Hassager, Jakob E Møller, Finn Gustafsson
OBJECTIVES: The authors sought to obtain hemodynamic estimates across a wide age span and in both sexes for future reference and compare these estimates with current guideline diagnostic hemodynamic thresholds for abnormal filling pressure and pulmonary hypertension. BACKGROUND: At present, the influence of age on hemodynamic function is largely unknown. Because many diseases with proposed cardiac impact are more prevalent in the older population, it is pivotal to know how hemodynamic parameters are affected by age itself to discern the influence of disease from that of physiological aging...
November 30, 2016: JACC. Heart Failure
https://www.readbyqxmd.com/read/28013417/left-atrial-mechanics-strongly-predict-functional-capacity-assessed-by-cardiopulmonary-exercise-testing-in-subjects-without-structural-heart-disease
#11
Luís Leite, Sofia Lázaro Mendes, Rui Baptista, Rogério Teixeira, Manuel Oliveira-Santos, Nelson Ribeiro, Rosa Coutinho, Victor Monteiro, Rui Martins, Graça Castro, Maria João Ferreira, Mariano Pego
Left atrium function is essential for cardiovascular performance and is evaluable by two-dimensional speckle-tracking echocardiography (2D-STE). Our aim was to determine how echocardiographic parameters interrelate with exercise capacity and ventilatory efficiency in subjects with no structural heart disease. Asymptomatic volunteers, in sinus rhythm and with normal biventricular size and function, were recruited from a community-based population. Individuals with moderate-to-severe valvular disease, pulmonary hypertension, and history of cardiac disease were excluded...
December 24, 2016: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/27996217/supervised-exercise-training-improves-exercise-cardiovascular-function-in-idiopathic-pulmonary-fibrosis
#12
Baruch Vainshelboim, Mordechai R Kramer, Benjamin D Fox, Shimon Izhakian, Alexander Sagie, Jose Oliveira
BACKGROUND: Idiopathic pulmonary fibrosis (IPF) is a chronic, progressive and fatal interstitial lung disease associated with cardiovascular impairments which compromise exercise tolerance and worsen prognosis. AIM: To examine the effect of participating in supervised exercise training (ET) program on cardiovascular function in patients with IPF. DESIGN: A randomized controlled study. SETTINGS: Outpatient hospital. POPULATION: Thirty-two IPF patients (68±8 yr)...
December 19, 2016: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27990432/kinetics-of-cardiac-output-at-the-onset-of-exercise-in-precapillary-pulmonary-hypertension
#13
Frédéric Lador, Aurélien Bringard, Samir Bengueddache, Guido Ferretti, Karim Bendjelid, Paola M Soccal, Stéphane Noble, Maurice Beghetti, Denis Chemla, Philippe Hervé, Olivier Sitbon
Purpose. Cardiac output (CO) is a cornerstone parameter in precapillary pulmonary hypertension (PH). The Modelflow (MF) method offers a reliable noninvasive determination of its beat-by-beat changes. So MF allows exploration of CO adjustment with the best temporal resolution. Methods. Fifteen subjects (5 PH patients, 10 healthy controls) performed a submaximal supine exercise on a cycle ergometer after 5 min of rest. CO was continuously determined by MF (COMF). Kinetics of heart rate (HR), stroke volume (SV), and CO were determined with 3 monoexponential models...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27984428/%C3%AE-adrenergic-responsiveness-in-the-type-2-diabetic-heart-effects-on-cardiac-reserve
#14
Genevieve A Wilson, Luke C Wilson, Regis R Lamberts, Kamran Majeed, Sudish Lal, Gerard T Wilkins, James C Baldi
: Type 2 diabetes (T2D) is associated with reduced cardiac reserve and aerobic capacity. Altered myocardial autonomic nervous regulation has been demonstrated in humans with diabetes (indirectly) and animal models (directly). PURPOSE: To determine the chronotopic and inotropic response of the type 2 diabetic heart to β-adrenergic stimulation. METHODS: 8 people with uncomplicated type 2 diabetes and 7 matched controls performed a DEXA scan and V[Combining Dot Above]O2peak test...
December 14, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27979984/haemodynamic-response-to-muscle-reflex-is-abnormal-in-patients-with-heart-failure-with-preserved-ejection-fraction
#15
Silvana Roberto, Gabriele Mulliri, Raffaele Milia, Roberto Solinas, Virginia Pinna, Gianmarco Sainas, Massimo F Piepoli, Antonio Crisafulli
The aim of the present investigation was to assess the role of cardiac diastole on the hemodynamic response to metaboreflex activation. We wanted to determine whether patients with diastolic function impairment showed a different hemodynamic response as compared to normal subjects during this reflex. Hemodynamics during the metaboreflex activation obtained by post-exercise muscle ischemia (PEMI) was assessed in 10 patients with diagnosed heart failure with preserved ejection fraction (HFpEF) and in 12 age-matched healthy controls (CTL)...
December 15, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27942980/age-differences-in-physiological-responses-to-self-paced-and-incremental-formula-see-text-testing
#16
Lauren A Jenkins, Alexis R Mauger, James G Hopker
PURPOSE: A self-paced maximal exercise protocol has demonstrated higher [Formula: see text] values when compared against traditional tests. The aim was to compare physiological responses to this self-paced [Formula: see text] protocol (SPV) in comparison to a traditional ramp [Formula: see text] (RAMP) protocol in young (18-30 years) and old (50-75 years) participants. METHODS: Forty-four participants (22 young; 22 old) completed both protocols in a randomised, counter-balanced, crossover design...
December 10, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27940957/magnetic-resonance-augmented-cardiopulmonary-exercise-testing-comprehensively-assessing-exercise-intolerance-in-children-with-cardiovascular-disease
#17
Nathaniel J Barber, Emmanuel O Ako, Gregorz T Kowalik, Mun H Cheang, Bejal Pandya, Jennifer A Steeden, Shahin Moledina, Vivek Muthurangu
BACKGROUND: Conventional cardiopulmonary exercise testing can objectively measure exercise intolerance but cannot provide comprehensive evaluation of physiology. This requires additional assessment of cardiac output and arteriovenous oxygen content difference. We developed magnetic resonance (MR)-augmented cardiopulmonary exercise testing to achieve this goal and assessed children with right heart disease. METHODS AND RESULTS: Healthy controls (n=10) and children with pulmonary arterial hypertension (PAH; n=10) and repaired tetralogy of Fallot (n=10) underwent MR-augmented cardiopulmonary exercise testing...
December 2016: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/27932673/are-there-sex-differences-in-the-capillary-blood-volume-and-diffusing-capacity-response-to-exercise
#18
Melissa M Bouwsema, Vincent Tedjasaputra, Michael K Stickland
Previous work suggests that women may exhibit a greater respiratory limitation to exercise compared to height-matched men. Diffusion capacity (DLCO) increases with incremental exercise, and the smaller lungs of women may limit membrane diffusing capacity (Dm) and pulmonary capillary blood volume (Vc) in response to the increased oxygen demand. We hypothesized that females would have a lower DLCO, DLCO relative to cardiac output (DLCO/Q), Dm, Vc, and pulmonary transit time, secondary to lower Vc at peak exercise...
December 8, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27931053/hemodynamic-responses-to-blood-flow-restriction-and-resistance-exercise-to-muscular-failure
#19
C A Libardi, A M Catai, M Miquelini, A Borghi-Silva, V Minatel, I F Alvarez, J C Milan-Mattos, H Roschel, V Tricoli, C Ugrinowitsch
The aim of the present study was to compare hemodynamic responses between blood flow-restricted resistance exercise (BFR-RE), high-intensity resistance exercise (HI-RE) and low-intensity resistance exercise (LI-RE) performed to muscular failure. 12 men (age: 20±3 years; body mass: 73.5±9 kg; height: 174±6 cm) performed 4 sets of leg press exercises using BFR-RE (30% of 1-RM), HI-RE (80% of 1-RM) and LI-RE (30% of 1-RM) protocols. Systolic (SBP) and diastolic blood pressure (DBP), heart rate (HR), stroke volume (SV), cardiac output (CO) and total peripheral vascular resistance (TPR) were measured on a beat-to-beat continuous basis by a noninvasive photoplethysmographic arterial pressure device...
December 8, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27930383/effect-of-e-oj-01-on-cardiac-conditioning-in-young-exercising-adults-a-randomized-controlled-trial
#20
Robert N Girandola, Shalini Srivastava
BACKGROUND AND AIM: Cardiac health is a determinant of athletic performance. A body of data suggests that in healthy young adults, an increase in maximal cardiac output leads to an increase in endurance. Terminalia arjuna (TA) has been studied for multiple benefits in cardiovascular health although its effects as a cardioprotective ergogenic aid require further exploration. The current trial was planned to study the effect of the proprietary TA extract (E-OJ-01) on the markers of cardiac conditioning in healthy young adults...
November 29, 2016: American Journal of Therapeutics
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