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https://www.readbyqxmd.com/read/28211843/performance-and-metabolic-demand-of-a-new-repeated-sprint-ability-test-in-basketball-players-does-the-number-of-changes-of-direction-matter
#1
Alessandro M Zagatto, Luca P Ardigò, Fabio A Barbieri, Fabio Milioni, Antonio Dello Iacono, Bruno H F Camargo, Johnny Padulo
This study compared two repeated-sprint ability tests in basketball players. Both tests included 10×30-m sprints, with the difference that the previously validated test (RSA2COD) featured two changes of direction (COD) per sprint, while the experimental test (RSA5COD) featured five CODs per sprint. Tests` performances and metabolic demands were specifically assessed in 20 basketball players. Firstly, RSA5COD test-retest reliability was investigated. Then RSA2COD, RSA5COD sprint times, peak speeds, oxygen uptake (VO2) and post-test blood lactate concentration [La] were measured...
November 5, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28209387/associations-of-cardiovascular-and-all-cause-mortality-events-with-oxygen-uptake-at-ventilatory-threshold
#2
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/28207959/lipoprotein-lipase-activity-does-not-predict-vldl-tg-fatty-acid-oxidation-during-exercise
#3
Esben Søndergaard, Iben R Andersen, Lars P Sørensen, Lars C Gormsen, Søren Nielsen
INTRODUCTION: Exercise lowers plasma triglyceride levels, but the physiological mechanisms remain not fully elucidated. Lipoprotein lipase (LPL) is a key enzyme in facilitating fatty acid uptake from lipoproteins. Since exercise increase the efficiency of VLDL-TG oxidation, we hypothesized that muscle LPL activity would be a rate-limiting step and predict VLDL-TG FA oxidation during exercise. METHODS: Sixteen healthy, lean subjects (8 men and 8 women) were examined before and during an acute exercise bout (90 min at 50% of VO2-max)...
February 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28207854/recumbent-stepper-submaximal-test-response-is-reliable-in-adults-with-and-without-stroke
#4
David R Wilson, Anna E Mattlage, Nicole M Seier, Jonathan D Todd, Brian G Price, Sarah J Kwapiszeski, Rakesh Vardey, Sandra A Billinger
PURPOSE: The purpose of the present study was to determine the reliability of the exercise response (predicted peak VO2) using the total body recumbent stepper (TBRS) submaximal exercise test in: 1) healthy adults 20-70 years of age and 2) adults participating in inpatient stroke rehabilitation. We hypothesized that the predicted peak VO2 (Visit 1) would have an excellent relationship (r > 0.80) to predicted peak VO2 (Visit 2). We also wanted to test whether the exercise response at Visit 1 and Visit 2 would be significantly different...
2017: PloS One
https://www.readbyqxmd.com/read/28203657/presence-of-peierls-pairing-and-absence-of-insulator-to-metal-transition-in-vo2-a-a-structure-property-relationship-study
#5
S R Popuri, A Artemenko, R Decourt, A Villesuzanne, M Pollet
Layered vanadium oxides have been extensively explored due to their interesting metal-insulator transitions and energy conversion/storage applications. In the present study, we have successfully synthesized VO2 (A) polymorph powder samples by a single-step hydrothermal synthesis process and consolidated them using spark plasma sintering. The structural and electronic properties of VO2 (A) are measured over a large temperature range from liquid helium, across the structural transition (400-440 K) and up to 500 K...
February 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28202808/a-broad-scale-comparison-of-aerobic-activity-levels-in-vertebrates-endotherms-versus-ectotherms
#6
James F Gillooly, Juan Pablo Gomez, Evgeny V Mavrodiev
Differences in the limits and range of aerobic activity levels between endotherms and ectotherms remain poorly understood, though such differences help explain basic differences in species' lifestyles (e.g. movement patterns, feeding modes, and interaction rates). We compare the limits and range of aerobic activity in endotherms (birds and mammals) and ectotherms (fishes, reptiles, and amphibians) by evaluating the body mass-dependence of VO2 max, aerobic scope, and heart mass in a phylogenetic context based on a newly constructed vertebrate supertree...
February 22, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28199951/a-dioxidovanadium-v-complex-of-nno-donor-schiff-base-as-a-selective-inhibitor-of-protein-tyrosine-phosphatase-1b-synthesis-characterization-and-biological-activities
#7
Yuqi Jia, Liping Lu, Miaoli Zhu, Caixia Yuan, Shu Xing, Xueqi Fu
A new dioxidovanadium (V) complex, VO2(HPPCH) (1) (H2PPCH = N'-picolinoylpyridin-1-ium-2-carbohydrazonate) has been synthesized and characterized by elemental analysis, IR, X-ray diffraction analysis and electrospray ionization mass spectra. Complex 1 crystallized in the monoclinic system with space group P21/c. It potently inhibited PTP1B with IC50 of 0.13 μM, about 7, 15 and 125-fold stronger against PTP1B than over TCPTP, SHP-1 and SHP-2, displaying obvious selectivity against PTP1B. Western blotting analysis indicated that complex 1 effectively increased the phosphorylation of PTP1B substrates, especially the phosphorylation of IR/IGF 1R and IRS-1...
February 6, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28199786/alpha-adrenergic-receptor-blockade-increases-capillarisation-and-fractional-o2-extraction-and-lowers-blood-flow-in-contracting-human-skeletal-muscle
#8
Stefan P Mortensen, Stuart Egginton, Mads Madsen, Jonas B Hansen, Gregers D W Munch, Ulrik Winning Iepsen, Thorbjörn Åkerström, Bente K Pedersen, Ylva Hellsten
AIM: To investigate the effect of elevated basal shear stress on angiogenesis in humans, and the role of enhanced skeletal muscle capillarisation on blood flow and O2 extraction. METHODS: Limb haemodynamics and O2 extraction was measured at rest and during one-leg knee-extensor exercise (12 and 24W) in 10 healthy untrained young men before and after 4 weeks treatment with an α1 receptor-antagonist (Terazosin, 1-2 mg day(-1) ). Corresponding biopsies were taken from the m...
February 15, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28198075/exercise-induced-b-lines-identify-worse-functional-and-prognostic-stage-in-heart-failure-patients-with-depressed-left-ventricular-ejection-fraction
#9
Maria Chiara Scali, Lauro Cortigiani, Anca Simionuc, Dario Gregori, Mario Marzilli, Eugenio Picano
AIMS: Exercise stress echocardiography (ESE) is recommended by the European Society of Cardiology guidelines for the evaluation of heart failure (HF) patients. Recently, lung ultrasound (LUS) has been proposed for the assessment of extravascular lung water through B-lines. The aim of this study was to assess B-lines during ESE in HF. METHODS AND RESULTS: Standard transthoracic and LUS evaluation was performed during semi-supine ESE in 103 NYHA class I-III HF patients (76 male; mean age 64 ± 12 years) with depressed LVEF (35 ± 8%)...
February 15, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28197892/the-effect-of-acute-aerobic-exercise-on-hemostasis-in-obstructive-sleep-apnea
#10
Ryan A Martin, Courtney Strosnider, Gabrielle Giersch, Christopher J Womack, Trent A Hargens
PURPOSE: Individuals with obstructive sleep apnea (OSA) have an altered hemostatic balance; however, the exercise response is less described. The purpose of this study is to determine the hemostatic response after acute aerobic exercise in obstructive sleep apnea. METHODS: Eighteen males (nine OSA vs. nine controls) were recruited from the university and local community. Individuals with evidence of cardiovascular, pulmonary, or metabolic disease were excluded. An apnea-hypopnea index (AHI) of >5 was a criterion for OSA...
February 14, 2017: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/28197617/mechanistic-insights-on-the-electronic-properties-and-electronic-atomic-structure-aspects-in-orthorhombic-srvo3-thin-films-xanes-exafs-study
#11
Aditya Sharma, Mayora Varshney, Weon Cheol Lim, Hyun-Joon Shin, Jitendra Pal Singh, Sung Ok Won, Keun Hwa Chae
Correlations among the B-O6 octahedra distortions, existing polymorphous phases, band structures and electronic conductivities of ABO3 perovskites are matters for debate and require a deep understanding of their local atomic/electronic structures and diverse assets. In this study, to illustrate the distortion in V-O6 octahedra and its implication on the band structure and electronic properties, spectroscopic investigations on the RF-sputtering grown insulating SrVO3 thin films were employed using X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS)...
February 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28195670/a-bunch-like-tertiary-amine-grafted-polysulfone-membrane-for-vrfbs-with-simultaneously-high-proton-conductivity-and-low-vanadium-ion-permeability
#12
Qinglong Tan, Shanfu Lu, Jiangju Si, Haining Wang, Chunxiao Wu, Xianfeng Li, Yan Xiang
Novel polysulfone membranes with bunch-like tertiary amine groups are synthesized with high ion selectivity and outstanding chemical stability for vanadium redox flow batteries (VRFBs). The bunch-like tertiary amine groups simultaneously act as an ionic conductor for proton hopping and vanadium ion transport obstacles. The performance of the membrane is tuned via controlling the grafting degree of the chloromethylated polysulfone. The results show that membranes show increasing proton over vanadium ion (σ/p) selectivity with increasing functional tertiary groups...
February 13, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28192034/physiological-and-perceived-responses-in-different-levels-of-exergames-in-elite-athletes
#13
Louisa Ming Yan Chung, Feng Hua Sun, Chris Tsz Man Cheng
OBJECTIVE: Exergames have been suggested to increase the public's physical activity and to benefit cardiovascular health, particularly among the youth. However, not many studies compared the physiological and perceived responses between exergames and the authentic sports especially for elite athletes. This study aimed to investigate the physiological and perceived responses in different levels of Nintendo(®) Wii Fit™ U rowing exergames in one group of elite rowing athletes. MATERIALS AND METHODS: All participants were asked to perform the authentic rowing on the indoor rowing machine on the first day and to play the rowing exergames on the second day, in three levels with 1 hour rest between levels...
February 2017: Games for Health
https://www.readbyqxmd.com/read/28181684/exercise-based-cardiac-rehabilitation-for-adults-with-atrial-fibrillation
#14
REVIEW
Signe S Risom, Ann-Dorthe Zwisler, Pernille P Johansen, Kirstine L Sibilitz, Jane Lindschou, Christian Gluud, Rod S Taylor, Jesper H Svendsen, Selina K Berg
BACKGROUND: Exercise-based cardiac rehabilitation may benefit adults with atrial fibrillation or those who had been treated for atrial fibrillation. Atrial fibrillation is caused by multiple micro re-entry circuits within the atrial tissue, which result in chaotic rapid activity in the atria. OBJECTIVES: To assess the benefits and harms of exercise-based rehabilitation programmes, alone or with another intervention, compared with no-exercise training controls in adults who currently have AF, or have been treated for AF...
February 9, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28181133/effects-of-aerobic-exercise-training-on-metabolism-of-nitric-oxide-and-endothelin-1-in-lung-parenchyma-of-rats-with-pulmonary-arterial-hypertension
#15
A Zimmer, R B Teixeira, J H P Bonetto, R Siqueira, C C Carraro, L M Donatti, A Hickmann, I E Litvin, A E G Godoy, A S Araujo, R Colombo, Adriane Belló-Klein
Pulmonary arterial hypertension (PAH) is characterized by vasoconstriction and proliferative obstruction of pulmonary vessels, which promotes a progressive increase in pulmonary vascular resistance (PVR). The effect of exercise training on oxidative stress, metabolism, and markers of nitric oxide (NO) and endothelin-1 (ET-1) was analyzed in the lung tissue of rats with PAH induced by monocrotaline (MCT).Twenty-four Wistar rats were divided into four groups (5-7 animals): sedentary control (SC), sedentary MCT (SM), trained control (TC), and trained MCT (TM)...
February 8, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28179805/a-new-whole-room-indirect-calorimeter-for-measurement-of-the-energetics-of-exercise
#16
Russell Rising, Kathryn Whyte, Jeanine Albu, Xavier Pi-Sunyer
The purpose of this study was to compare the accuracy of exercise energy expenditure (EXEE) measurements from a metabolic cart (HG_MC) to that obtained with a new exercise whole room indirect calorimeter (EX_WRIC). First, the HG_MC and the EX_WRIC were subjected to 10, 30-min ethanol (99.8% purity) and propane (99.5% purity) combustion validations, respectively, for EE, ventilation rates (liters) of oxygen (VO2), carbon dioxide (VCO2), and the respiratory quotient (RQ; VCO2/VO2). Then, 15 healthy adults (13 men and 2 women) cycled at 65% age predicted heart rate max for random determination of their EXEE, VO2, VCO2 and RQ after a 12-hr fast with both the HG-MC and EX_WRIC...
December 2016: Journal of Exercise Physiology Online
https://www.readbyqxmd.com/read/28179011/cardiorespiratory-and-metabolic-responses-to-body-mass-based-squat-exercise-in-young-men
#17
Miki Haramura, Yohei Takai, Takaya Yoshimoto, Masayoshi Yamamoto, Hiroaki Kanehisa
BACKGROUND: The purpose of this study was to quantify cardiorespiratory and metabolic responses to body mass-based squat exercise, with specific emphasis on the relationships with the exercise duration. METHODS: Fifteen healthy young men performed body mass-based squat exercise as well as an incremental loaded bicycle test, which determine maximal oxygen uptake and maximal heart rate, with an interval of 2 days between the tests. During both tasks, oxygen uptake, blood lactate concentration (BLa), and heart rate (HR) were determined...
February 8, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28168782/physiological-responses-during-the-practice-of-synchronized-swimming-a-systematic-review
#18
REVIEW
Kátia Ponciano, Maria Luiza de Jesus Miranda, Miwako Homma, João Marcelo Queiroz Miranda, Aylton J Figueira Júnior, Cássio De Miranda Meira Júnior, Danilo Sales Bocalini
This study is aimed at analysing the scientific literature related to physiological responses in synchronized swimmers, produced from 2006 to 2016. A systematic review was conducted using electronic databases (Google Scholar, PubMed, SportDiscus, Web Science, Scielo and Scopus) in national and international journals. The articles were selected using the following inclusion criteria: composed samples of synchronized swimmers of both sexes, articles in English, Spanish and Portuguese, published from 2006 to 2016...
February 6, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28168652/impaired-tissue-oxygenation-in-metabolic-syndrome-requires-increased-microvascular-perfusion-heterogeneity
#19
P Mason McClatchey, Fan Wu, I Mark Olfert, Christopher G Ellis, Daniel Goldman, Jane E B Reusch, Jefferson C Frisbee
Metabolic syndrome (MS) in obese Zucker rats (OZR) is associated with impaired skeletal muscle performance and blunted hyperemia. Studies suggest that reduced O2 diffusion capacity is required to explain compromised muscle performance and that heterogeneous microvascular perfusion distribution is critical. We modeled tissue oxygenation during muscle contraction in control and OZR skeletal muscle using physiologically realistic relationships. Using a network model of Krogh cylinders with increasing perfusion asymmetry and increased plasma skimming, we predict increased perfusion heterogeneity and decreased muscle oxygenation in OZR, with partial recovery following therapy...
February 6, 2017: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/28166185/heat-exposure-and-hypohydration-exacerbate-physiological-strain-during-load-carrying
#20
Elizabeth L Adams, Douglas J Casa, Robert A Huggins, Julie K DeMartini, Rebecca L Stearns, Rachel M Kennedy, Lindsay J DiStefano, Lawrence E Armstrong, Carl M Maresh
Heat exposure and hypohydration induce physiological and psychological strain during exercise; however, it is unknown if the separate effects of heat exposure and hypohydration are synergistic when co-occurring during loaded exercise. This study compared separate and combined effects of heat exposure and hypohydration on physiological strain, mood state, and visual vigilance during loaded exercise. Twelve males (mean±SD; age, 20±2 years; body mass, 74.0±8.2 kg; maximal oxygen uptake, 57.0±6.0 mLkg-1min-1) completed 4 trials under the following conditions: euhydrated temperate (EUT), hypohydrated temperate (HYT), euhydrated hot (EUH), and hypohydrated hot (HYH)...
February 1, 2017: Journal of Strength and Conditioning Research
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