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https://www.readbyqxmd.com/read/27918851/influence-of-a-100-m-simulated-in-water-rescue-on-cardiopulmonary-parameters
#1
Ana Sousa, Ricardo J Fernandes, Núria Rodríguez, J Arturo Abraldes
OBJECTIVE: Cardiopulmonary resuscitation (CPR) after a drowning episode is performed under fatigue conditions. However, the characterization of CPR in this context is still unknown. Our purpose was to investigate the effect of a 100-m simulated in-water rescue on CPR and physiological parameters in trained certified lifeguards. METHODS: Thirty trained certified lifeguards (age 24.6 ± 3.8 yrs; height 178.2 ± 7.4 cm and weight 76.9 ± 10.6 kg) completed two protocols using an adult manikin: (i) 4-min CPR after 4-min baseline conditions (CPR), and (ii) 4-min CPR after a 100-m simulated in-water rescue in the sea (CPR Rescue), both with a compression-ventilation ratio of 30:2...
December 5, 2016: Prehospital Emergency Care
https://www.readbyqxmd.com/read/27918660/vo2-at-maximal-and-supramaximal-intensities-lessons-to-high-interval-training-in-swimming
#2
Ana Sousa, João Paulo Vilas-Boas, Ricardo J Fernandes, Pedro Figueiredo
PURPOSE: To establish appropriate work intensity for interval training that would elicit maximal oxygen uptake (VO2max) for well-trained swimmers. METHODS: 12 male competitive swimmers completed an incremental protocol to determine the minimum velocity at VO2max (vVO2max) and, in randomized order, three square wave exercises from rest to 95, 100 and 105% of vVO2max. Temporal aspects of the VO2 response were examined in these latter. RESULTS: Swimming at 105% of vVO2max took less (p<0...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27916643/homeostatic-effects-of-exercise-and-sleep-on-metabolic-processes-in-mice-with-an-overexpressed-skeletal-muscle-clock
#3
Allison J Brager, Lydia Heemstra, Raman Bhambra, J Christopher Ehlen, Karyn A Esser, Ketema N Paul, Colleen M Novak
Brain and muscle-ARNT-like factor (Bmal1/BMAL1) is an essential transcriptional/translational factor of circadian clocks. Loss of function of Bmal1/BMAL1 is highly disruptive to physiological and behavioral processes. In light of these previous findings, we examined if transgenic overexpression of Bmal1/BMAL1 in skeletal muscle could alter metabolic processes. First, we characterized in vivo and ex vivo metabolic phenotypes of muscle overexpressed mice (male and female) compared to wild-type littermates (WT)...
December 1, 2016: Biochimie
https://www.readbyqxmd.com/read/27916346/cardiopulmonary-exercise-testing-is-a-better-outcome-predictor-than-exercise-echocardiography-in-asymptomatic-aortic-stenosis
#4
Olivia Domanski, Marjorie Richardson, Augustin Coisne, Anne-Sophie Polge, Stephanie Mouton, François Godart, Jean Louis Edmé, Regis Matran, Patrizio Lancellotti, David Montaigne
BACKGROUND: Objective assessment of maximal aerobic capacity using peak oxygen consumption (peak VO2) can be helpful in the management of patients with asymptomatic aortic stenosis (AS). The relationship between peak VO2 and AS severity criteria derived from rest and supine exercise echocardiography (SEE) has never been explored. OBJECTIVES: We aimed to determine whether low peak VO2 (<85% of predicted value) is associated with severity parameters in SEE, and poor clinical outcome...
November 3, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27915207/fixed-distance-walk-tests-at-comfortable-and-fast-speed-potential-tools-for-the-functional-assessment-of-coronary-patients
#5
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/27914920/can-lowering-the-guidance-force-of-robot-assisted-gait-training-induce-a-sufficient-metabolic-demand-in-subacute-dependent-ambulatory-stroke-patients
#6
So Young Lee, Eun Young Han, Bo Ryun Kim, Min Ho Chun, Yong Ki Lee
OBJECTIVE: To assess the effects of guidance force (GF) and gait speed (GS) on cardiorespiratory responses and energy cost in subacute dependent ambulatory stroke patients. DESIGN: Cross sectional study. SETTING: University rehabilitation hospital. PARTICIPANTS: Ten subacute stroke patients (mean age: 64.50±19.20), who were dependent ambulators (functional ambulation category [FAC] ≤2). INTERVENTIONS: Patients participated in cardiorespiratory tests during robot-assisted gait training...
November 30, 2016: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/27909313/nanoscale-self-templating-for-oxide-epitaxy-with-large-symmetry-mismatch
#7
Xiang Gao, Shinbuhm Lee, John Nichols, Tricia L Meyer, Thomas Z Ward, Matthew F Chisholm, Ho Nyung Lee
Direct observations using scanning transmission electron microscopy unveil an intriguing interfacial bi-layer that enables epitaxial growth of a strain-free, monoclinic, bronze-phase VO2(B) thin film on a perovskite SrTiO3 (STO) substrate. We observe an ultrathin (2-3 unit cells) interlayer best described as highly strained VO2(B) nanodomains combined with an extra (Ti,V)O2 layer on the TiO2 terminated STO (001) surface. By forming a fully coherent interface with the STO substrate and a semi-coherent interface with the strain-free epitaxial VO2(B) film above, the interfacial bi-layer enables the epitaxial connection of the two materials despite their large symmetry and lattice mismatch...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27908464/effects-of-different-duration-exercise-programs-in-children-with-severe-burns
#8
Robert P Clayton, Paul Wurzer, Clark R Andersen, Ronald P Mlcak, David N Herndon, Oscar E Suman
INTRODUCTION: Burns lead to persistent and detrimental muscle breakdown and weakness. Standard treatment at our institution includes a voluntary 12-week rehabilitative exercise program to limit and reverse the effects of increased muscle catabolism. In the present work, we investigated if different durations of exercise, 6 or 12 weeks, produce comparable improvements in muscle strength, body composition, and cardiopulmonary fitness. METHODS: We prospectively enrolled and randomized patients with ≥30% total body surface area (TBSA) burned to receive 6 or 12 weeks of exercise rehabilitation...
November 28, 2016: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/27904163/the-impact-of-direct-cardiac-output-determination-on-using-a-widely-available-direct-continuous-oxygen-consumption-measuring-device-on-the-hemodynamic-assessment-of-aortic-valve
#9
Zaher Fanari, Matthew Grove, Anitha Rajamanickam, Sumaya Hammami, Cassie Walls, Paul Kolm, Mitchell Saltzberg, William S Weintraub, Andrew J Doorey
BACKGROUND: Accurate assessment of cardiac output (CO) is essential for the hemodynamic assessment of aortic valve area (AVA). Estimation of oxygen consumption (VO2) and Thermodilution (TD) is employed in many cardiac catheterization laboratories (CCL) given the historically cumbersome nature of direct continuous VO2 measurement, the "gold standard" for this technique. A portable facemask device simplifies the direct continuous measurement of VO2, allowing for relatively rapid and continuous assessment of CO and AVA...
September 2016: Delaware Medical Journal
https://www.readbyqxmd.com/read/27904162/impact-of-catheterization-lab-computer-software-settings-on-hemodynamic-assessment-of-aortic-stenosis
#10
Zaher Fanari, Anitha Rajamanickam, Mathew Grove, Sumaya Hammami, Cassie Walls, Paul Kolm, William Weintraub, Andrew J Doorey
BACKGROUND: Accurate assessment of Cardiac Output (CO) is a critical measurement in the calculation of aortic valve area (AVA). Due to the known inaccuracy of estimated Fick calculations, many measure thermodilution (TD) CO as well due to previous studies showing better correlation with the gold standard direct CO. Previous studies showed suboptimal correlation between both methods. Most physicians assume that the TD CO is chosen by catheterization laboratory software for AVA evaluation...
July 2016: Delaware Medical Journal
https://www.readbyqxmd.com/read/27901289/the-influence-of-physical-characteristics-on-the-resting-energy-expenditure-of-youth-a-meta-analysis
#11
REVIEW
Stephen D Herrmann, Robert G McMurray, Youngdeok Kim, Erik A Willis, Minsoo Kang, Thomas McCurdy
OBJECTIVE: To examine the literature on resting energy expenditure (REE) of youth and determine the influence of age, sex, BMI, and body composition on REE. METHODS: A literature search was conducted using PubMed, BIOSIS Previews, NTIS, EMBASE, MEDLINE, and Pascal databases for studies with data on resting metabolic rate, REE, resting oxygen uptake (or VO2 ) in healthy children, youth, or adolescents (age = 1-18 years). Over 200 publications were identified; sixty-one publications met criteria and were included in the meta-analyses, resulting in 142 study population estimates (totaling 5,397 youth) of REE...
November 30, 2016: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/27900769/influence-of-menstrual-phase-and-arid-vs-humid-heat-stress-on-autonomic-and-behavioural-thermoregulation-during-exercise-in-trained-but-unacclimated-women
#12
Tze-Huan Lei, Stephen R Stannard, Blake G Perry, Zachary J Schlader, James D Cotter, Toby Mündel
We studied thermoregulatory responses of ten well-trained (VO2 max, 57 (7) mL min(-1) kg(-1) ) eumenorrheic women exercising in dry and humid heat, across their menstrual cycle. They completed four trials, each of resting and cycling at fixed intensities (125 and 150 W), to assess autonomic regulation, then self-paced intensity (30-min work trial), to assess behavioural regulation. Trials were in early-follicular (EF) and mid-luteal (ML) phases in dry (DRY) and humid (HUM) heat matched for wet bulb globe temperature (WBGT, 27°C)...
November 29, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27900172/comparative-effects-of-three-48-week-community-based-physical-activity-and-exercise-interventions-on-aerobic-capacity-total-cholesterol-and-mean-arterial-blood-pressure
#13
Steven Mann, Alfonso Jimenez, Sarah Domone, Chris Beedie
AIM: Insufficient research examines the treatment effectiveness of real-world physical activity (PA) interventions. PURPOSE: We investigated the effects of 3 interventions on directly measured cardiovascular variables. All treatments and measures were administered in community settings by fitness centre staff. METHODS: Participants were sedentary individuals receiving no medication to reduce cardiovascular disease (CVD) risk (n=369, age 43 ±5 years)...
2016: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/27895211/improvement-in-aerobic-capacity-during-cardiac-rehabilitation-in-coronary-artery-disease-patients-is-there-a-role-for-autonomic-adaptations
#14
Davide Lazzeroni, Paolo Castiglioni, Matteo Bini, Andrea Faini, Umberto Camaiora, Pietro Tito Ugolotti, Claudio Stefano Centorbi, Lorenzo Brambilla, Valerio Brambilla, Massimo Francesco Piepoli, Paolo Coruzzi
BACKGROUND: It has been previously shown in patients with heart failure that exercise-based rehabilitation programmes may improve functional capacity and autonomic response. The aim of this study was to investigate this issue further by evaluating whether an association exists between autonomic adaptations and improvements of aerobic capacity in a general population of coronary artery disease patients undergoing cardiac rehabilitation. METHODS: Ninety consecutive patients (age 60 ± 11 years) attended a rehabilitation programme of moderate continuous training (25 ± 8 sessions, 2-3 sessions/week)...
November 28, 2016: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/27892519/current-induced-polycrystalline-to-crystalline-transformation-in-vanadium-dioxide-nanowires
#15
Junho Jeong, Zheng Yong, Arash Joushaghani, Alexander Tsukernik, Suzanne Paradis, David Alain, Joyce K S Poon
Vanadium dioxide (VO2) exhibits a reversible insulator-metal phase transition that is of significant interest in energy-efficient nanoelectronic and nanophotonic devices. In these applications, crystalline materials are usually preferred for their superior electrical transport characteristics as well as spatial homogeneity and low surface roughness over the device area for reduced scattering. Here, we show applied electrical currents can induce a permanent reconfiguration of polycrystalline VO2 nanowires into crystalline nanowires, resulting in a dramatically reduced hysteresis across the phase transition and reduced resistivity...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27891098/deceptive-manipulation-of-competitive-starting-strategies-influences-subsequent-pacing-physiological-status-and-perceptual-responses-during-cycling-time-trials
#16
Emily L Williams, Hollie S Jones, S Andy Sparks, David C Marchant, Adrian W Midgley, Craig A Bridge, Lars R McNaughton
Little is currently known regarding competitor influence on pacing at the start of an event and in particular the subsequent effect on the remaining distance. The purpose of the present study was to investigate the influence of starting pace on the physiological and psychological responses during cycling time trials (TT) utilizing an innovative approach allowing pace to be accurately and dynamically replicated, as well as deceptively manipulated. Ten competitive male cyclists completed five 16.1 km TT, two baseline trials performed alone (BLs), and three with a simulated, dynamic avatar of which they were to match the pace of for the initial 4 km...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27890861/computed-tomography-angiography-planning-identifies-the-target-vessel-for-optimum-infarct-location-and-improves-clinical-outcome-in-alcohol-septal-ablation-for-hypertrophic-obstructive-cardiomyopathy
#17
Robert Michael Cooper, Sukumaran Rajeswari Binukrishnan, Adeel Shahzad, Jonathan Hasleton, Ulrich Sigwart, Rodney Hilton Stables
AIMS: Alcohol septal ablation (ASA) is an established treatment option in HOCM. ASA is ineffective in some: inaccurate infarct and inability to identify a vessel contribute. We aimed to improve accuracy of infarct using CT angiography guidance and provide a more predictable and satisfactory outcome. METHODS AND RESULTS: Twenty-one successive patients with symptomatic LVOT obstruction refractory to medication underwent CT angiography planning to guide ASA. CT was performed using a dual source CT system...
November 29, 2016: EuroIntervention
https://www.readbyqxmd.com/read/27888580/biology-of-vo2-max-looking-under-the-physiology-lamp
#18
REVIEW
C Lundby, D Montero, M Joyner
In this review, we argue that several key features of maximal oxygen uptake (VO2 max) should underpin discussions about the biological and reductionist determinants of its interindividual variability: (i) training-induced increases in VO2 max are largely facilitated by expansion of red blood cell volume and an associated improvement in stroke volume, which also adapts independent of changes in red blood cell volume. These general concepts are also informed by cross-sectional studies in athletes that have very high values for VO2 max...
November 7, 2016: Acta Physiologica
https://www.readbyqxmd.com/read/27887692/mechanisms-of-effort-intolerance-in-patients-with-heart-failure-and-borderline-ejection-fraction
#19
Yan Topilsky, Zach Rozenbaum, Shafik Khoury, Gregg S Pressman, Yaniv Gura, Jack Sherez, Avi Man, Jason Shimiaie, Sanford Edwards, Joshua Berookhim, Thierry Le Tourneau, Amir Halkin, Simon Biner, Gad Keren, Galit Aviram
Combining echocardiography and cardiopulmonary stress testing allows noninvasive assessment of hemodynamics, and oxygen extraction (A-VO2 difference). We evaluated mechanisms of effort intolerance in patients with heart failure with borderline (40% to 49%) left ventricular ejection fraction (EF) (HF and Borderline Ejection fraction). We included 89 consecutive patients with HF and Borderline Ejection fraction (n = 25; 63.6 ± 14 years, 64% men), control subjects (n = 22), patients with HF with preserved EF (n = 26; EF ≥50%), and patients with HF with reduced EF (n = 16; <40%)...
November 1, 2016: American Journal of Cardiology
https://www.readbyqxmd.com/read/27885098/energy-costs-and-performance-of-transfemoral-amputees-and-non-amputees-during-walking-and-running-a-pilot-study
#20
Larry J Mengelkoch, Jason T Kahle, M Jason Highsmith
BACKGROUND: Limited information is available concerning the effects of prosthetic foot components on energy costs and ambulatory performance for transfemoral amputees. OBJECTIVES: Compare energy costs (VO2; gait economy) and ambulatory performance (self-selected walking speeds, self-selected running speeds, peak running speeds) differences during walking and running for transfemoral amputees and matched, non-amputee runners. STUDY DESIGN: Repeated measures...
November 24, 2016: Prosthetics and Orthotics International
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