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https://www.readbyqxmd.com/read/29148627/assessment-of-endpoint-criteria-and-perceived-barriers-during-maximal-cardiorespiratory-fitness-testing-among-pregnant-women
#1
Caitlin M Hesse, Rachel A Tinius, Bailey J Cooley, Alyssa A Olenick, Maire M Blankenship, Donald L Hoover, Jill M Maples
BACKGROUND: A plateau in volume of oxygen consumption (VO2) is the primary indicator for determining if an individual has reached their maximal aerobic capacity. However, secondary criteria can also be used to identify maximal effort (i.e. lactate level, rating of perceived exertion (RPE), percent of age-predicted maximal heart rate (HR) and respiratory exchange ratio (RER)). Age and gender-specific secondary criteria have been developed for the general population, but no secondary criteria have been established for pregnant women...
November 17, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29143104/left-ventricular-end-diastolic-dimension-and-septal-e-are-predictors-of-cardiac-index-at-rest-while-tricuspid-annular-plane-systolic-excursion-is-a-predictor-of-peak-oxygen-uptake-in-patients-with-pulmonary-hypertension
#2
Yoshihisa Nakano, Naoki Okumura, Shiro Adachi, Shigetake Shimokata, Fumitaka Tajima, Yoshihiro Kamimura, Toyoaki Murohara, Takahisa Kondo
Little is known regarding a correlation of hemodynamics at rest or exercise capacity with echocardiographic parameters in patients with pulmonary hypertension (PH). To clarify these potential correlations, we performed transthoracic echocardiography, right heart catheterization, and cardiopulmonary exercise testing in 53 patients with pulmonary arterial hypertension (PAH) and chronic thromboembolic pulmonary hypertension (CTEPH). Left ventricular end-diastolic dimension (LVDd), early diastolic velocity of the septal mitral annulus (septal e'), tricuspid regurgitation peak gradient (TRPG), and tricuspid annular plane systolic excursion (TAPSE) were significantly correlated with cardiac index (LVDd; r = 0...
November 15, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/29141858/interleukin-1-blockade-in-recently-decompensated-systolic-heart-failure-results-from-redhart-recently-decompensated-heart-failure-anakinra-response-trial
#3
Benjamin W Van Tassell, Justin Canada, Salvatore Carbone, Cory Trankle, Leo Buckley, Claudia Oddi Erdle, Nayef A Abouzaki, Dave Dixon, Dinesh Kadariya, Sanah Christopher, Aaron Schatz, Jessica Regan, Michele Viscusi, Marco Del Buono, Ryan Melchior, Pranav Mankad, Juan Lu, Robin Sculthorpe, Giuseppe Biondi-Zoccai, Edward Lesnefsky, Ross Arena, Antonio Abbate
BACKGROUND: An enhanced inflammatory response predicts worse outcomes in heart failure (HF). We hypothesized that administration of IL-1 (interleukin-1) receptor antagonist (anakinra) could inhibit the inflammatory response and improve peak aerobic exercise capacity in patients with recently decompensated systolic HF. METHODS AND RESULTS: We randomly assigned 60 patients with reduced left ventricular ejection fraction (<50%) and elevated C-reactive protein levels (>2 mg/L), within 14 days of hospital discharge, to daily subcutaneous injections with anakinra 100 mg for 2 weeks, 12 weeks, or placebo...
November 2017: Circulation. Heart Failure
https://www.readbyqxmd.com/read/29135817/a-primer-on-the-use-of-equivalence-testing-for-evaluating-measurement-agreement
#4
Philip M Dixon, Pedro F Saint-Maurice, Youngwon Kim, Paul Hibbing, Yang Bai, Gregory J Welk
PURPOSE: Statistical equivalence testing is more appropriate than conventional tests of difference to assess the validity of physical activity (PA) measures. This paper presents the underlying principles of equivalence testing and gives three examples from PA and fitness assessment research. METHODS: The three examples illustrate different uses of equivalence tests. Example 1 uses PA data to evaluate an activity monitor's equivalence to a known criterion. Example 2 illustrates the equivalence of two field-based measures of physical fitness with no known reference method...
November 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29131965/in-situ-visualization-of-fast-surface-ion-diffusion-in-vanadium-dioxide-nanowires
#5
Yasen Hou, Rui Xiao, Xin Tong, Scott Dhuey, Dong Yu
We investigate in situ ion diffusion in vanadium dioxide (VO2) nanowires (NWs) by using photocurrent imaging. Alkali metal ions are injected into a NW segment via ionic liquid gating and are shown to diffuse along the NW axis. The visualization of ion diffusion is realized by spatially resolved photocurrent measurements, which detect the charge carrier density change associated with the ion incorporation. Diffusion constants are determined to be on the order of 10(-10) cm(2)/s for both Li(+) and Na(+) ions at room temperature, while H(+) diffuses much slower...
November 15, 2017: Nano Letters
https://www.readbyqxmd.com/read/29126582/effect-of-body-mass-index-on-exercise-capacity-in-patients-with-hypertrophic-cardiomyopathy
#6
Carolyn M Larsen, Caroline A Ball, Virginia B Hebl, Kevin C Ong, Konstantinos C Siontis, Thomas P Olson, Michael J Ackerman, Steve R Ommen, Thomas G Allison, Jeffrey B Geske
The objective of this study was to evaluate the relation between body mass index (BMI), exercise capacity, and symptoms in patients with hypertrophic cardiomyopathy (HC) and to utilize results of cardiopulmonary exercise tests (CPX) and transthoracic echocardiograms to understand the mechanism(s) of reduced exercise capacity across body mass index groups. Over a 6-year period, 510 consecutive patients with HC seen at a tertiary referral center underwent (CPX) and a transthoracic echocardiogram. Increasing BMI was associated with decreased exercise capacity as assessed by peak VO2 (ml/kg/min)...
October 12, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/29123488/wearing-compression-tights-on-the-thigh-during-prolonged-running-attenuated-exercise-induced-increase-in-muscle-damage-marker-in-blood
#7
Sahiro Mizuno, Mari Arai, Fumihiko Todoko, Eri Yamada, Kazushige Goto
Purpose: To examine the effects of wearing a lower-body compression garment with different body coverage areas during prolonged running on exercise performance and muscle damage. Methods: Thirty male subjects were randomly assigned to one of three groups: (1) wearing a compression tights with 15 mmHg to thigh [n = 10, CT group], (2) wearing a compression socks with 15 mmHg to calf [n = 10, CS group], and (3) wearing a lower-body garment with < 5 mmHg to thigh and calf [n = 10, CON group]. The exercise consisted of 120 min of uphill running at 55% of [Formula: see text]O2max...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29123389/alveolar-capillary-reserve-during-exercise-in-patients-with-chronic-obstructive-pulmonary-disease
#8
Mehrdad Behnia, Courtney M Wheatley, Alberto Avolio, Bruce D Johnson
Background: Factors limiting exercise in patients with COPD are complex. With evidence for accelerated pulmonary vascular aging, destruction of alveolar-capillary bed, and hypoxic pulmonary vasoconstriction, the ability to functionally expand surface area during exercise may become a primary limitation. Purpose: To quantify measures of alveolar-capillary recruitment during exercise and the relationship to exercise capacity in a cohort of COPD patients. Methods: Thirty-two subjects gave consent (53% male, with mean ± standard deviation age 66±9 years, smoking 35±29 pack-years, and Global Initiative for Chronic Obstructive Lung Disease (GOLD) classification of 0-4: 2...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/29119418/low-level-laser-therapy-improves-the-vo2-kinetics-in-competitive-cyclists
#9
Fábio J Lanferdini, Renata L Krüger, Bruno M Baroni, Caetano Lazzari, Pedro Figueiredo, Alvaro Reischak-Oliveira, Marco A Vaz
Some evidence supports that low-level laser therapy (LLLT) reduces neuromuscular fatigue, so incrementing sports performance. A previous randomized controlled trial of our group showed increased exercise tolerance in male competitive cyclists treated with three different LLLT doses (3, 6, and 9 J/diode; or 135, 270, and 405 J/thigh) before time-to-exhaustion cycling tests. Now, the present study was designed to evaluate the effects of these LLLT doses on the VO2 kinetics of athletes during cycling tests. Twenty male competitive cyclists (29 years) participated in a crossover, randomized, double-blind, and placebo-controlled trial...
November 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29117929/a-fully-automated-web-based-program-improves-lifestyle-habits-and-hba1c-in-patients-with-type-2-diabetes-and-abdominal-obesity-randomized-trial-of-patient-e-coaching-nutritional-support-the-anode-study
#10
Boris Hansel, Philippe Giral, Laetitia Gambotti, Alexandre Lafourcade, Gilbert Peres, Claude Filipecki, Diana Kadouch, Agnes Hartemann, Jean-Michel Oppert, Eric Bruckert, Michel Marre, Arnaud Bruneel, Emilie Duchene, Ronan Roussel
BACKGROUND: The prevalence of abdominal obesity and type 2 diabetes mellitus (T2DM) is a public health challenge. New solutions need to be developed to help patients implement lifestyle changes. OBJECTIVE: The objective of the study was to evaluate a fully automated Web-based intervention designed to help users improve their dietary habits and increase their physical activity. METHODS: The Accompagnement Nutritionnel de l'Obésité et du Diabète par E-coaching (ANODE) study was a 16-week, 1:1 parallel-arm, open-label randomized clinical trial...
November 8, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/29115018/relationship-between-exercise-capacity-and-glucose-tolerance-in-cystic-fibrosis
#11
Karla Foster, Guixia Huang, Nanhua Zhang, Joseph Crisalli, Barbara Chini, Raouf Amin, Deborah Elder
BACKGROUND: Improved exercise capacity (EC) and normal glucose tolerance (NGT) are independently associated with favorable outcomes in CF, however, little information on this relationship exists in patients with CF. METHODS: Cardiopulmonary exercise tests, oral glucose tolerance tests (OGTT), and HbA1c values measured within a 12-month period were evaluated on 83 pediatric patients diagnosed with CF. Patients were categorized as having NGT, abnormal glucose tolerance (AGT), or CF-related diabetes (CFRD)...
November 8, 2017: Pediatric Pulmonology
https://www.readbyqxmd.com/read/29114512/the-runsmart-training-program-effect-on-oxygen-consumption-and-lower-extremity-biomechanics-during-running
#12
Jennifer Bogulski, Steven Gonser, Doug Bush, Rachel Bugner, Lindsey Clark, Lisa Farrell, Kristen Swanson, Michael David Ross
As recreational running continues to gain popularity, more individuals are seeking ways to improve running performance. RunSmart is a running intervention program designed to enhance a runner's form. In addition to correcting flaws in a runner's form, RunSmart offers the opportunity for runners to continue a regular regimen while slowly integrating changes in form. The purpose of this case series was twofold: to determine if the RunSmart program coincides with improvements in oxygen consumption (VO2), a variable often associated with better running performance times, and to evaluate the RunSmart program in regard to enhancing gait biomechanics...
August 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29112466/the-effect-of-inspiratory-resistance-on-exercise-performance-and-perception-in-moderate-normobaric-hypoxia
#13
Yongsuk Seo, Jeremiah Vaughan, Tyler D Quinn, Brittany Followay, Raymond Roberge, Ellen L Glickman, Jung-Hyun Kim
Seo, Yongsuk, Jeremiah Vaughan, Tyler D. Quinn, Brittany Followay, Raymond Roberge, Ellen L. Glickman, and Jung-Hyun Kim. The effect of inspiratory resistance on exercise performance and perception in moderate normobaric hypoxia. High Alt Med Biol. 00:000-000, 2017. PURPOSE: Respirators are simple and efficient in protecting workers against toxic airborne substances; however, their use may limit the physical performance of workers. The purpose of this study was to determine the effect of inspiratory resistance on physical performance and breathing perception in normobaric hypoxia...
November 7, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/29111629/effects-of-muay-thai-training-frequency-on-body-composition-and-physical-fitness-in-healthy-untrained-women
#14
Jeniffer A de S Rapkiewicz, João P Nunes, Jerry L Mayhew, Alex Silva Ribeiro, Hellen C Garcez Nabuco, Maria T Fávero, Emerson Franchini, Matheus Amarante do Nascimento
BACKGROUND: The purpose of the study was to compare the effects of different frequencies of Muay Thai training on body composition, and physical fitness in healthy untrained women. METHODS: Twenty women were randomly assigned to one of two training groups: G2X (n = 9) performed Muay Thai twice a week, while G3X (n = 11) performed the same program three times a week, both for 13 weeks. Anthropometric dimensions, fat-free mass, fat mass, resting metabolic rate, VO2 max, upper-body and abdominal muscle endurance, explosive leg power, agility, flexibility, and dietary intake were measured at pre and post-training...
November 7, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29111289/-oxygen-peak-consumption-is-a-better-predictor-of-cardiovascular-risk-than-handgrip-strength-in-older-chilean-women
#15
Claudio Farías-Valenzuela, Cristian Pérez-Luco, Rodrigo Ramírez-Campillo, Cristian Álvarez, Mauricio Castro-Sepúlveda
BACKGROUND: Handgrip strength (HS) and peak oxygen consumption (Vo2peak) are powerful predictors of cardiovascular risk, although it is unknown which of the two variables is the better predictor. AIM: The objective of the following study was to relate HS and Vo2peak to cardiovascular risk markers in older Chilean women. METHODS: Physically active adult women (n=51; age, 69±4.7years) participated in this study. The HS and Vo2peak were evaluated and related to the anthropometric variables of body mass, body mass index (BMI), waist circumference (WC), hip circumference (HC), waist ratio (WR), and waist height ratio (WHR), as well as with the cardiovascular variables systolic (SBP) and diastolic (DBP) and cardiac recovery in one minute (RHR1)...
October 27, 2017: Revista Española de Geriatría y Gerontología
https://www.readbyqxmd.com/read/29099665/analysis-of-muscular-activity-and-dynamic-response-of-the-lower-limb-adding-vibration-to-cycling
#16
Marcela Munera, William Bertucci, Sebastien Duc, Xavier Chiementin
Vibration in cycling has been proved to have undesirable effects over health, comfort and performance of the rider. In this study, 15 participants performed eight 6-min sub-maximal pedalling exercises at a constant power output (150W) and pedalling cadence (80 RPM) being exposed to vibration at different frequencies (20, 30, 40, 50, 60, 70 Hz) or without vibration. Oxygen uptake (VO2), heart rate (HR), surface EMG activity of seven lower limb muscles (GMax, RF, BF, VM, GAS, SOL and TA) and 3-dimentional accelerations at ankle, knee and hip were measured during the exercises...
November 3, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29098615/the-benefits-of-exercise-training-on-aerobic-capacity-in-patients-with-heart-failure-and-preserved-ejection-fraction
#17
Danilo Marcelo Leite do Prado, Enéas Antônio Rocco
Heart failure with preserved ejection fraction (HFpEF) is defined as an inability of the ventricles to optimally accept blood from atria with blunted end- diastolic volume response by limiting the stroke volume and cardiac output. The HEpEF prevalence is higher in elderly and women and may be associated to hypertension, diabetes mellitus and atrial fibrillation. Severe exercise intolerance, manifested by dyspnea and fatigue during physical effort is the important chronic symptom in HFpEF patients, in which is the major determinant of their reduced quality of life...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29096114/surface-engineering-on-continuous-vo2-thin-films-to-improve-thermochromic-properties-top-down-acid-etching-and-bottom-up-self-patterning
#18
Ning Wang, Yew Keat Peh, Shlomo Magdassi, Yi Long
Surface engineering is an effective method to improve the thermochromic performance of VO2. In this paper, an acid-etching top down method was proposed to tailor the VO2 surface morphology from the continuous dense-packed surface to patterned structure, which exhibited the enhanced integrated visible transmittance (Tlum) and the enlarged solar modulating abilities (ΔTsol). Moreover, a self-patterning approach was also illustrated to improve the thermochromic properties. The proposed surface engineering methods represent a facile and cost-effective approach for enhancing thermochromic properties that could promote the application of VO2 thin films in smart windows...
October 30, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29094919/dual-band-modulation-of-visible-and-near-infrared-light-transmittance-in-an-all-solution-processed-hybrid-micro-nano-composite-film
#19
Xiao Liang, Mei Chen, Shumeng Guo, Lanying Zhang, Fasheng Li, Huai Yang
Smart windows with controllable visible and near-infrared light transmittance can significantly improve the building's energy efficiency and inhabitant comfort. However, most of the current smart window technology cannot achieve the target of ideal solar control. Herein, we present a novel all-solution-processed hybrid micronano composite smart material that have four optical states to separately modulate the visible and NIR light transmittance through voltage and temperature, respectively. This dual-band optical modulation was achieved by constructing a phase-separated polymer framework, which contains the microsized liquid crystals domains with a negative dielectric constant and tungsten-doped vanadium dioxide (W-VO2) nanocrystals (NCs)...
November 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29093503/the-influence-of-structural-disorder-and-phonon-on-metal-to-insulator-transition-of-vo-2
#20
In-Hui Hwang, Zhenlan Jin, Chang-In Park, Sang-Wook Han
We used temperature-dependent x-ray absorption fine structure (XAFS) measurements to examine the local structural properties around vanadium atoms at the V K edge from VO2 films. A direct comparison of the simultaneously-measured resistance and XAFS regarding the VO2 films showed that the thermally-driven structural transition occurred prior to the resistance transition during a heating, while  this change simultaneously occured during a cooling. Extended-XAFS (EXAFS) analysis revealed significant increases of the Debye-Waller factors of the V-O and V-V pairs in the {111} direction of the R-phase VO2 that are due to the phonons of the V-V arrays along the same direction in a metallic phase...
November 1, 2017: Scientific Reports
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