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Anaerobic threshold

Francisco Martín Rodríguez, Cristina Fernández Pérez, Miguel Castro Villamor, José Luis Martín Conty, Pedro Arnillas Gómez, Verónica Casado Vicente
OBJECTIVES: Our aim was to determine the usefulness of level D personal protective equipment (PPE) in safeguarding health care staff who perform cardiopulmonary resuscitation (CPR). MATERIAL AND METHODS: Quasi-experimental, uncontrolled trial in 96 volunteers chosen randomly and stratified by sex, level of training, and professional category. The subjects were selected from a convenience sample of 164 nurses, physicians, and students of nursing and medicine (40 men [41...
2018: Emergencias: Revista de la Sociedad Española de Medicina de Emergencias
Conor Raleigh, Bernard Donne, Neil Fleming
We compared lactate threshold (TLac ) with non-invasive markers of an aerobic-anaerobic transition; namely, ventilatory (VT) and tissue saturation index (TSIT ) thresholds. While identification of a breakpoint in blood lactate concentration ([BLa]) is common for determination of an aerobic-anaerobic transition, non-invasive measures, VT and NIRS, have also received attention as a means of determining this critical exercise intensity. We hypothesised that one or other of these non-invasive measures would have a strong association with TLac ...
2018: International Journal of Exercise Science
Pedro B Junior, Vitor L de Andrade, Eduardo Z Campos, Carlos A Kalva-Filho, Alessandro M Zagatto, Gustavo G de Araújo, Marcelo Papoti
Due to the controversy about the sensitive of lactate minimum intensity (LMI) to training and the need to develop other tool for aerobic fitness evaluation, the purpose of this study was to analyze the sensitivity of glucose minimum intensity (GMI) and LMI to endurance training. Eight trained male cyclists (21.4 ± 1.9 years, 67.6 ± 7.5 kg and 1.72 ± 0.10 m) were evaluated twice, before and after 12 weeks of training. GMI and LMI were calculated, respectively, by the lowest blood glucose and lactate values attained during an incremental test performed after a hyperlactemia induction, and VO2 max was determined during standard incremental effort...
March 2018: Journal of Sports Science & Medicine
José V Subiela, Sonia H Torres, Juan B De Sanctis, Noelina Hernández
There is evidence that myocardial infarction (MI) patients have an inflammatory process that includes skeletal muscles, and exercise has been reported to reduce some inflammatory markers. The aim of this work was to study NO and some inflammatory markers in quadriceps muscle of MI patients before and after cardiac rehabilitation. Muscle biopsy was obtained in17 MI patients before and after CR and only once in 11 healthy subjects. Several cardiorespiratory and metabolic parameters were evaluated and skeletal muscle levels of nitric oxide synthases, nitrate, nitrite, nitrotyrosine, tumor necrosis factor alpha (TNF-α), transforming growth factor beta (TGF-β), interleukin- 6 (IL-6) and CD154...
March 10, 2018: Nitric Oxide: Biology and Chemistry
Leonardo Henrique Dalcheco Messias, Emanuel Elias Camolese Polisel, Fúlvia Barros Manchado-Gobatto
Our first aim was to compare the anaerobic threshold (AnT) determined by the incremental protocol with the reverse lactate threshold test (RLT), investigating the previous cycling experience effect. Secondarily, an alternative RLT application based on heart rate was proposed. Two groups (12 per group-according to cycling experience) were evaluated on cycle ergometer. The incremental protocol started at 25 W with increments of 25 W at each 3 minutes, and the AnT was calculated by bissegmentation, onset of blood lactate concentration and maximal deviation methods...
2018: PloS One
Samuel Wittekind, Wayne Mays, Yvette Gerdes, Sandra Knecht, John Hambrook, William Border, John Lynn Jefferies
Patients with a Fontan circulation have impaired exercise capacity. Cardiac rehabilitation (CR) has shown promise in enhancing peak exercise parameters in this population, but an improvement in submaximal exercise has not been consistently demonstrated. We assessed the hypothesis that participation in CR will be associated with more efficient oxygen extraction and ventilation during submaximal exercise. In this prospective study, pediatric Fontans completed two 60 min CR sessions per week for 12 weeks. Cardiopulmonary exercise testing and stress echocardiography were performed at baseline and last CR session, and then compared with a paired sample t test...
March 9, 2018: Pediatric Cardiology
Y Lu, R Liaquat, S Astals, P D Jensen, D J Batstone, S Tait
The relationship between anaerobic digestion operational conditions and (i) microbial community, (ii) acetoclastic methanogenic activity and (iii) free ammonia (NH3 ) inhibition resilience was investigated. Thirteen inocula were obtained from full and pilot scale digesters fed with different substrates, digester configurations, operating temperatures and NH3 concentrations (0.1-241 mgN·L-1 ). Substrate type and temperature were the primary factors influencing microbial community composition. Methanogenic activity ranged from 0...
March 3, 2018: New Biotechnology
Xiaojing Zhang, Yue Zhou, Siyu Zhao, Rongrong Zhang, Zhaoxue Peng, Hanfei Zhai, Hongzhong Zhang
In this study, the effect of Fe (II) on Anaerobic Ammonium Oxidation (ANAMMOX) process was investigated by step-wise increasing the Fe (II) in influent from 1 to 50 mg L-1 . The nitrogen removal, biofilm property and the microbial community were analyzed in each phase. Results showed that, the anaerobic ammonia-oxidizing bacteria (AAOB) bioactivity and the nitrogen removal of ANAMMOX system were slightly improved to 0.58 from the initial 0.51 kg m-3 d-1 by Fe (II) in 1-5 mg L-1 . The nitrogen removal was suppressed and could recover to the initial level during the same period under 10-20 mg L-1 Fe (II), while it did not recover to the initial level under 30 mg L-1 Fe (II) and showed no recovery performance under 50 mg L-1 Fe (II)...
February 22, 2018: Chemosphere
Shiyu Li, Changliang Yang, Changhui Peng, Haixia Li, Bin Liu, Chuan Chen, Bingyu Chen, Jinyue Bai, Chen Lin
The adsorption/desorption of arsenic (As) at the sediment-water interface in lakes is the key to understanding whether As can enter the ecosystem and participate in material circulation. In this study, the concentrations of As(III), total arsenic [As(T)], sulfide, iron (Fe), and dissolved organic carbon (DOC) in overlying water were observed after the initial sulfate (SO4 2- ) concentrations were increased by four gradients in the presence and absence of microbial systems. The results indicate that increased SO4 2- concentrations in overlying water triggered As desorption from sediments...
February 23, 2018: Ecotoxicology and Environmental Safety
Yajie Li, Salma Tabassum, Chunfeng Chu, Zhenjia Zhang
In this paper, the inhibition of methanogens by phenol in coal gasification wastewater (CGW) was investigated by both anaerobic toxicity tests and a lab-scale anaerobic biofilter reactor (AF). The anaerobic toxicity tests indicated that keeping the phenol concentration in the influent under 280mg/L could maintain the methanogenic activity. In the AF treating CGW, the result showed that adding glucose solution as co-substrate could be beneficial for the quick start-up of the reactor. The effluent chemical oxygen demand (COD) and total phenol reached 1200 and 100mg/L, respectively, and the methane production rate was 175mLCH4 /gCOD/day...
February 2018: Journal of Environmental Sciences (China)
Mariana Ribeiro Silva, Cristine Lima Alberton, Elisa Gouvêa Portella, Gabriela Neves Nunes, Daniela Gomez Martin, Stephanie Santana Pinto
This study aimed to investigate the effects of two water-based training programs (aerobic and combined) and a non-periodized physical activity program on functional capacity and quality of life (QoL) of elderly women. Forty-one elderly female volunteers (65 ± 4 years) were divided into three groups: aerobic training group (WBA, n = 13), combined training (sequence: resistance/aerobic; WBC; n = 11) and a control group of non-periodized physical activity program (CG, n = 9). The participants performed the water-based trainings twice a week for 12 weeks...
February 21, 2018: Experimental Gerontology
R Kumar, G Garcea
INTRODUCTION: Cardiopulmonary exercise testing (CPET) is a reliable, reproducible and non-invasive measure of functional capacity. CPET has been increasingly used to assess pre-operative risk and stratify patients at risk of mortality and morbidity following surgery. CPET parameters that predict outcomes within liver and pancreas cancer surgery still remain to be defined. METHODS: A systematic review to assess CPET use in predicting post-operative outcomes in liver and pancreas cancer surgery was carried out using the following databases AMED, CINAHL, Cochrane Library, EMBASE, Google Scholar and PubMED...
February 20, 2018: International Journal of Surgery
Dailson Paulucio, Bruno M Costa, Caleb G M Santos, Fernando Nogueira, Alexander Koch, Marco Machado, Bruna Velasques, Pedro Ribeiro, Fernando Ams Pompeu
Taurine (TA) ingestion has been touted as blunting the deleterious effects of ethanol (ET) ingestion on motor performance. This study investigated the effects of ingestion of 0.6 mL·kg-1 of ET, 6 grams of TA, and ethanol in combination with taurine (ET+TA) on economy of movement (EM) and heart rate (HR). Nine volunteers, five female (22 ± 3 years) and four male (26 ± 5 years), participated in a study that used a counterbalanced experimental design. EM and HR were measured for 6 min while the subjects were pedalling at a fixed load 10% below the anaerobic threshold...
December 2017: Biology of Sport
Jessica Whibley, Christopher J Peters, Laura J Halliday, Asif M Chaudry, William H Allum
INTRODUCTION: Esophageal and gastric cancer have a poor prognosis and surgical intervention is associated with considerable morbidity, highlighting the need for careful preoperative assessment. The Incremental Shuttle Walk Test (ISWT) and Cardiopulmonary exercise testing (CPET) can assess preoperative fitness. This study aims to investigate their correlation with both postoperative respiratory complications and overall survival. PATIENTS AND METHODS: Patients were identified who underwent esophageal or gastric resections for cancer between 2010 and 2014 and had ISWT and/or CPET assessments...
February 6, 2018: European Journal of Surgical Oncology
Cong Wang, Yan Huang, Li Li, Jun Guo, Zhengyun Wu, Yu Deng, Lirong Dai, Shichun Ma
A novel facultatively anaerobic, Gram-stain-positive, non-motile, non-spore-forming, catalase-negative bacterium of the genus Lactobacillus, designated strain Bb 2-3T , was isolated from bee bread of Apis cerana collected from a hive in Kunming, China. The strain was regular rod-shaped. Optimal growth occurred at 37 °C, pH 6.5 with 5.0 g l-1 NaCl. The predominant fatty acids were C18 : 1ω9c, C16 : 0 and C19 : 0 iso. Respiratory quinones were not detected. Seven glycolipids, three lipids, phosphatidylglycerol and diphosphatidylglycerol were detected...
January 10, 2018: International Journal of Systematic and Evolutionary Microbiology
T E F Abbott, M Gooneratne, J McNeill, A Lee, D Z H Levett, M P W Grocott, M Swart, N MacDonald
BACKGROUND: Despite the increasing importance of cardiopulmonary exercise testing (CPET) for preoperative risk assessment, the reliability of CPET interpretation is unclear. We aimed to assess inter-observer reliability of preoperative CPET. METHODS: We conducted a prospective, multi-centre, observational study of preoperative CPET interpretation. Participants were professionals with previous experience or training in CPET, assessed by a standardized questionnaire...
March 2018: British Journal of Anaesthesia
Yoshie Nogami, Yoshihiro Seo, Masayoshi Yamamoto, Tomoko Ishizu, Kazutaka Aonuma
Wave intensity (WI) is a novel noninvasive index of circulatory dynamics that reflects ventriculo-arterial coupling. It is calculated as the product of the first derivative of blood pressure and that of flow velocity measured by carotid echocardiography. This study aimed to clarify the clinical implications of WI and its relation with carbon dioxide production (VE/VCO 2 slope). Twenty-one healthy volunteers (control group) and 21 patients with hypertension (HT group) underwent cardiopulmonary exercise testing (CPX) and exercise stress echocardiography...
February 12, 2018: Heart and Vessels
Julio Cesar Silva de Sousa, Camila Torriani-Pasin, Amanda Barboza Tosi, Rafael Yokoyama Fecchio, Luiz Augusto Riani da Costa, Cláudia Lúcia de Moraes Forjaz
OBJECTIVE: To evaluate whether virtual reality games (VRG) in stroke survivors produce significant and reproducible heart rate (HR) and oxygen consumption (VO2) responses during their execution, corresponding to an intensity between the anaerobic threshold (AT) and the respiratory compensation point (RCP). DESIGN: Single subjects repeated measure design SETTING: Stroke survivors registered from a rehabilitation program PARTICIPANTS: Twelve chronic hemiparetic stroke survivors (10 men, 58 ± 12 years) rated at 3 or 4 in the Functional Ambulation Categories (FAC)...
February 8, 2018: Archives of Physical Medicine and Rehabilitation
Tian-Xiang Chen, Bigyan Pudasaini, Jian Guo, Su-Gang Gong, Rong Jiang, Lan Wang, Qin-Hua Zhao, Wen-Hui Wu, Ping Yuan, Jin-Ming Liu
Background: Sex differences in chronic thromboembolic pulmonary hypertension (CTEPH) have been revealed in few studies. Although right heart catheterization (RHC) is the gold standard for clinical diagnosis and assessment of prognosis in pulmonary hypertension (PH), cardiopulmonary exercise testing (CPET) has been a more widely used assessment of functional capacity, disease severity, prognosis, and treatment response in PH. We hypothesized that the "sex-specific" CPET indices could estimate the severity of inoperable CTEPH...
2018: International Journal of Chronic Obstructive Pulmonary Disease
Yi Tang, Lei Yao, Zhihong Liu, Wenlin Xie, Xiuping Ma, Qin Luo, Zhihui Zhao, Zhiwei Huang, Liu Gao, Qi Jin, Xue Yu, Changming Xiong, Xinhai Ni, Yinkun Yan, Wenwei Qi
BACKGROUND: Studies have shown that peak circulatory power (peak CircP; peak oxygen uptake × peak systolic blood pressure) is a variable predictor of prognosis in patients with left heart failure. It remains unknown whether peak CircP also predicts outcome in patients with idiopathic pulmonary arterial hypertension (IPAH). METHODS: Patients with newly diagnosed IPAH who underwent symptom-limited cardiopulmonary exercise testing (CPET) from 1 January 2011 to 1 January 2014 in Fuwai Hospital were prospectively enrolled and followed for up to 66 months for cardiac events (mortality and lung transplantation)...
February 2018: Respiratory Medicine
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