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"Anaerobic threshold"

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https://www.readbyqxmd.com/read/28071950/reporting-individual-surgeon-outcomes-does-not-lead-to-risk-aversion-in-abdominal-aortic-aneurysm-surgery
#1
A Saratzis, A Thatcher, M F Bath, D A Sidloff, M J Bown, J Shakespeare, R D Sayers, C Imray
INTRODUCTION Reporting surgeons' outcomes has recently been introduced in the UK. This has the potential to result in surgeons becoming risk averse. The aim of this study was to investigate whether reporting outcomes for abdominal aortic aneurysm (AAA) surgery impacts on the number and risk profile (level of fitness) of patients offered elective treatment. METHODS Publically available National Vascular Registry data were used to compare the number of AAAs treated in those centres across the UK that reported outcomes for the periods 2008-2012, 2009-2013 and 2010-2014...
January 10, 2017: Annals of the Royal College of Surgeons of England
https://www.readbyqxmd.com/read/28067808/effects-of-beetroot-juice-supplementation-on-cardiorespiratory-endurance-in-athletes-a-systematic-review
#2
REVIEW
Raúl Domínguez, Eduardo Cuenca, José Luis Maté-Muñoz, Pablo García-Fernández, Noemí Serra-Paya, María Carmen Lozano Estevan, Pablo Veiga Herreros, Manuel Vicente Garnacho-Castaño
Athletes use nutritional supplementation to enhance the effects of training and achieve improvements in their athletic performance. Beetroot juice increases levels of nitric oxide (NO), which serves multiple functions related to increased blood flow, gas exchange, mitochondrial biogenesis and efficiency, and strengthening of muscle contraction. These biomarker improvements indicate that supplementation with beetroot juice could have ergogenic effects on cardiorespiratory endurance that would benefit athletic performance...
January 6, 2017: Nutrients
https://www.readbyqxmd.com/read/28067536/history-of-erectile-dysfunction-as-a-predictor-of-poor-physical-performance-after-an-acute-myocardial-infarction
#3
Leonida Compostella, Caterina Compostella, Li Van Stella Truong, Nicola Russo, Tiziana Setzu, Sabino Iliceto, Fabio Bellotto
Background Erectile dysfunction may predict future cardiovascular events and indicate the severity of coronary artery disease in middle-aged men. The aim of this study was to evaluate whether erectile dysfunction (expression of generalized macro- and micro-vascular pathology) could predict reduced effort tolerance in patients after an acute myocardial infarction. Patients and methods One hundred and thirty-nine male patients (60 ± 12 years old), admitted to intensive cardiac rehabilitation 13 days after a complicated acute myocardial infarction, were evaluated for history of erectile dysfunction using the International Index of Erectile Function questionnaire...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28043202/sex-specific-cardiopulmonary-exercise-testing-indices-related-to-hemodynamics-in-idiopathic-pulmonary-arterial-hypertension
#4
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
#5
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/28034783/cerebellar-insulin-igf-1-signaling-in-diabetic-rats-effects-of-exercise-training
#6
Mariana Eiras Borges, Alessandra Mussi Ribeiro, José Rodrigo Pauli, Luciana Mendonça Arantes, Eliete Luciano, Leandro Pereira de Moura, José Alexandre Curiacos de Almeida Leme, Alessandra Medeiros, Natália Oliveira Bertolini, Clarice Yoshiko Sibuya, Ricardo José Gomes
The Diabetes Mellitus (DM) is a chronic disease associated with loss of brain regions such as the cerebellum, increasing the risk of developing neurodegenerative diseases such as Parkinson's disease (PD). In the brain of diabetic and PD organisms the insulin/IGF-1 signaling is altered. Exercise training is an effective intervention for the prevention of neurodegerative diseases since it release neurotrophic factors and regulating insulin/IGF-1 signaling in the brain. This study aimed to evaluate the proteins involved in the insulin/IGF-1 pathway in the cerebellum of diabetic rats subjected to exercise training protocol...
December 26, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27930876/pioglitazone-on-improves-whole-body-aerobic-capacity-and-skeletal-muscle-energy-metabolism-in-patients-with-metabolic-syndrome
#7
Takashi Yokota, Shintaro Kinugawa, Kagami Hirabayashi, Tadashi Suga, Shingo Takada, Masashi Omokawa, Tomoyasu Kadoguchi, Masashige Takahashi, Arata Fukushima, Shouji Matsushima, Mayumi Yamato, Koichi Okita, Hiroyuki Tsutsui
AIMS/INTRODUCTION: Low aerobic capacity is a strong and independent predictor of all-cause mortality in patients with metabolic syndrome (MetS). Here, we investigated the effects of pioglitazone treatment on whole-body aerobic capacity and skeletal muscle energy metabolism in MetS patients. MATERIALS AND METHODS: Fourteen male patients with MetS received oral 15 mg/day pioglitazone for 4 months. To assess whole-body aerobic capacity, exercise testing with a bicycle ergometer was performed before and after pioglitazone treatment...
December 8, 2016: Journal of Diabetes Investigation
https://www.readbyqxmd.com/read/27871205/the-effects-of-two-different-swimming-training-periodization-on-physiological-parameters-at-various-exercise-intensities
#8
Vicente Javier Clemente-Suárez, Athanasios Dalamitros, João Ribeiro, Ana Sousa, Ricardo J Fernandes, J Paulo Vilas-Boas
This study analysed the effects of two different periodization strategies on physiological parameters at various exercise intensities in competitive swimmers. Seventeen athletes of both sexes were divided to two groups, the traditional periodization (TPG, n = 7) and the reverse periodization group (RPG, n = 10). Each group followed a 10-week training period based on the two different periodization strategies. Before and after training, swimming velocity (SV), energy expenditure (EE), energy cost (EC) and percentage of aerobic (%Aer) and anaerobic (%An) energy contribution to the swimming intensities corresponding to the aerobic threshold (AerT), the anaerobic threshold (AnT) and the velocity at maximal oxygen uptake (vVO2max) were measured...
November 21, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27865723/mechanisms-of-effort-intolerance-in-patients-with-rheumatic-mitral-stenosis-combined-echocardiography-and-cardiopulmonary-stress%C3%A2-protocol
#9
Michal Laufer-Perl, Yaniv Gura, Jason Shimiaie, Jack Sherez, Gregg S Pressman, Galit Aviram, Simon Maltais, Ricki Megidish, Amir Halkin, Meirav Ingbir, Simon Biner, Gad Keren, Yan Topilsky
OBJECTIVES: This study sought to evaluate mechanisms of effort intolerance in patients with rheumatic mitral stenosis (MS). BACKGROUND: Combined stress echocardiography and cardiopulmonary testing allows assessment of cardiac function, hemodynamics, and oxygen extraction (A-Vo2 difference). METHODS: Using semirecumbent bicycle exercise, 20 patients with rheumatic MS (valve area 1.36 ± 0.4 cm(2)) were compared to 20 control subjects at 4 pre-defined activity stages (rest, unloaded, anaerobic threshold, and peak)...
November 10, 2016: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/27856303/effects-of-tibetan-turnip-brassica-rapa-l-on-promoting-hypoxia-tolerance-in-healthy-humans
#10
Bingquan Chu, Chun Chen, Jiaojie Li, Xiaojian Chen, Yunhong Li, Weimin Tang, Lu Jin, Ying Zhang
ETHNOPHARMACOLOGICAL RELEVANCE: Tibetan turnip (Brassica rapa L.), widely distributed in Tibet region, is an edible and medical plant with effects of "tonic and anti-hypoxia" "heat-clearing and detoxification" and "alleviating fatigue" according to traditional Tibetan medical books. AIM OF THE STUDY: This research systematically studied the effects of Tibetan turnip on promoting hypoxia-tolerance in humans and the mechanisms. MATERIALS AND METHODS: A 7-d, self-control and single-blind human feeding trial was conducted among 27 healthy subjects with 8 males and 10 females in feeding group fed with 7...
January 4, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/27848017/effects-of-a-12-week-short-interval-intermittent-low-intensity-slow-jogging-program-on-skeletal-muscle-fat-infiltration-and-fitness-in-older-adults-randomized-controlled-trial
#11
Masahiro Ikenaga, Yosuke Yamada, Yujiro Kose, Kazuhiro Morimura, Yasuki Higaki, Akira Kiyonaga, Hiroaki Tanaka
PURPOSE: We developed a short-interval, low-intensity, slow-jogging (SJ) program consisting of sets of 1 min of SJ at walking speed and 1 min of walking. We aimed to examine the effects of an easily performed SJ program on skeletal muscle, fat infiltration, and fitness in older adults. METHODS: A total of 81 community-dwelling, independent, older adults (70.8 ± 4.0 years) were randomly assigned to the SJ or control group. The SJ group participants were encouraged to perform 90 min of SJ at their anaerobic threshold (AT) intensity and 90 min of walking intermittently per week...
November 15, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27832671/exercise-based-cardiac-rehabilitation-in-coronary-disease-training-impulse-or-modalities
#12
P-M Leprêtre, M Ghannem, M Bulvestre, S Ahmaidi, S Delanaud, T Weissland, P Lopes
To compare the effects of 2 short programs with similar training load (TL), based on combined aerobic - resistance training (CT) or aerobic training (AT) on cardiorespiratory responses, 32 patients with coronary heart disease (CHD: 63.8±8.0y, 1.73±0.06 m, 84.8±15.9 kg, Left Ventricular Ejection Fraction: 0.53±0.8) performed 4 weeks of exercise rehabilitation based on CT (n=16) or AT (n=16). Maximal tolerated power (MTP), peak values of oxygen uptake (VO2peak) and heart rate (HRpeak), anaerobic threshold (VT1) were determined during an incremental cycling exercise test before and after training periods...
December 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27810297/small-unrepaired-ventricular-septal-defects-reveal-poor-exercise-capacity-compared-with-healthy-peers-a-prospective-cohort-study
#13
Marie Maagaard, Johan Heiberg, Vibeke E Hjortdal
BACKGROUND: Small ventricular septal defects (VSDs) are considered to be without hemodynamic influence and most remain unrepaired. However, studies recently described late cardiac adverse consequences that could potentially affect functional capacity. Yet, this has never been assessed in adulthood. Therefore, the aim was to determine peak exercise capacity in adults with small VSDs compared with healthy, matched controls. METHODS: In a prospective, cohort study we included patients with unrepaired VSDs and healthy controls, (age 18 to 40years)...
January 15, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/27765184/effect-of-aldosterone-antagonism-on%C3%A2-exercise-tolerance-in-heart-failure-with%C3%A2-preserved-ejection-fraction
#14
Wojciech Kosmala, Aleksandra Rojek, Monika Przewlocka-Kosmala, Leah Wright, Andrzej Mysiak, Thomas H Marwick
BACKGROUND: Impaired functional capacity is a hallmark of patients with heart failure with preserved ejection fraction (HFpEF). Despite the association of HFpEF with reduced myocardial compliance attributed to fibrosis, spironolactone has not been shown to alter outcomes-perhaps reflecting the heterogeneity of underlying pathological mechanisms. OBJECTIVES: The authors sought to identify improvement in exercise capacity with spironolactone in the subset of patients with HFpEF with exercise-induced increase in ratio between early mitral inflow velocity and mitral annular early diastolic velocity (E/e') reflecting elevation of left ventricular (LV) filling pressure...
October 25, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27747790/fat-utilization-during-high-intensity-exercise-when-does-it-end
#15
Ratko Peric, Marco Meucci, Zoran Nikolovski
BACKGROUND: This study examined substrate oxidation at high-intensity exercise and aimed to determine when fat oxidation ends (FATmin). We hypothesized the existence of a connection between the anaerobic threshold (AnT) and FATmin point. METHODS: Breath-by-breath data obtained from indirect calorimetry during a graded treadmill test were used to measure substrate oxidation and maximal oxygen uptake (VO2max) on 47 males (30 athletes (ATL) and 17 non-athletes (NATL))...
December 2016: Sports Medicine—Open
https://www.readbyqxmd.com/read/27742182/discriminating-circulatory-problems-from-deconditioning-echocardiogram-and-cardio-pulmonary-exercise-test-analysis
#16
Zach Rozenbaum, Shafik Khoury, Galit Aviram, Yaniv Gura, Jack Sherez, Avi Man, Jason Shimiaie, Thierry Le Tourneau, Amir Halkin, Simon Biner, Gad Keren, Yan Topilsky
BACKGROUND: Discriminating circulatory problems with reduced stroke volume from de-conditioning in which the muscles cannot consume O2 normally by gas exchange parameters is difficult. METHODS: We performed combined stress echo and cardio-pulmonary (CPET) tests in 110 patients (20 normal effort capacity, 54 attenuated stroke volume response, 36 de-conditioning) to evaluate multiple hemodynamic parameters and oxygen content difference (A-VO2 Difference) in four predefined activity levels to assess which of the gas measures may help in the discrimination...
October 11, 2016: Chest
https://www.readbyqxmd.com/read/27721367/a-pair-of-identical-twins-discordant-for-myalgic-encephalomyelitis-chronic-fatigue-syndrome-differ-in-physiological-parameters-and-gut-microbiome-composition
#17
Ludovic Giloteaux, Maureen R Hanson, Betsy A Keller
BACKGROUND Patients with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) present with profound fatigue, flu-like symptoms, pain, cognitive impairment, orthostatic intolerance, and post-exertional malaise (PEM), and exacerbation of some or all of the baseline symptoms. CASE REPORT We report on a pair of 34-year-old monozygotic twins discordant for ME/CFS, with WELL, the non-affected twin, and ILL, the affected twin. Both twins performed a two-day cardiopulmonary exercise test (CPET), pre- and post-exercise blood samples were drawn, and both provided stool samples for biochemical and molecular analysis...
October 10, 2016: American Journal of Case Reports
https://www.readbyqxmd.com/read/27676142/post-exercise-neurovascular-control-in-chronic-heart-failure-patients
#18
T S Nobre, R V Groehs, L F Azevedo, L M Antunes-Correa, D G Martinez, M J N N Alves, C E Negrao
It remains unknown whether or not a reduction in muscle sympathetic nerve activity in heart failure patients is associated over time with the effects of long- or short-term repeated exercise. 10 chronic heart failure patients, age 49±3 years old, functional class I-III NYHA, ejection fraction <40% were randomly submitted to either an acute bout of moderate continuous exercise OR high-intensity interval exercise. Muscle sympathetic nerve activity (microneurography) and forearm blood flow (venous occlusion plethysmography) were evaluated pre- and post-exercise sessions...
December 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27664807/endothelial-function-and-arterial-stiffness-relate-to-functional-outcomes-in-adolescent-and-young-adult-fontan-survivors
#19
Bryan H Goldstein, Elaine M Urbina, Philip R Khoury, Zhiqian Gao, Michelle A Amos, Wayne A Mays, Andrew N Redington, Bradley S Marino
BACKGROUND: Fontan survivors demonstrate diminished vascular function and functional outcomes, but the relationships between these measures have not been established. METHODS AND RESULTS: We performed a cross-sectional study of 60 Fontan survivors (52% male) with a mean age of 13.9±4.1 years and mean Fontan duration of 9.9±4.2 years. Multimodality assessment of endothelial function (reactive hyperemia index and flow-mediated dilation) and arterial stiffness (augmentation index and baseline pulse amplitude) was performed with peripheral arterial tonometry and brachial flow-mediated dilation...
September 24, 2016: Journal of the American Heart Association
https://www.readbyqxmd.com/read/27600918/test-retest-reliability-and-four-week-changes-in-cardiopulmonary-fitness-in-stroke-patients-evaluation-using-a-robotics-assisted-tilt-table
#20
Jittima Saengsuwan, Lucia Berger, Corina Schuster-Amft, Tobias Nef, Kenneth J Hunt
BACKGROUND: Exercise testing devices for evaluating cardiopulmonary fitness in patients with severe disability after stroke are lacking, but we have adapted a robotics-assisted tilt table (RATT) for cardiopulmonary exercise testing (CPET). Using the RATT in a sample of patients after stroke, this study aimed to investigate test-retest reliability and repeatability of CPET and to prospectively investigate changes in cardiopulmonary outcomes over a period of four weeks. METHODS: Stroke patients with all degrees of disability underwent 3 separate CPET sessions: 2 tests at baseline (TB1 and TB2) and 1 test at follow up (TF)...
September 6, 2016: BMC Neurology
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