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Aerobic threshold

Krzysztof Durkalec-Michalski, Emilia E Zawieja, Tomasz Podgórski, Igor Łoniewski, Bogna E Zawieja, Marta Warzybok, Jan Jeszka
BACKGROUND: Sodium bicarbonate (SB) has been proposed as an ergogenic aid, as it improves high-intensity and resistance exercise performance. However, no studies have yet investigated SB application in CrossFit. This study examined the effects of chronic, progressive-dose SB ingestion on CrossFit-like performance and aerobic capacity. METHODS: In a randomized, double-blind, cross-over trial, 21 CrossFit-trained participants were randomly allocated to 2 groups and underwent 2 trials separated by a 14-day washout period...
2018: PloS One
Bina Eftekharsadat, Elmira Porjafar, Fariba Eslamian, Seyed Kazem Shakouri, Hamid Reza Fadavi, Seyed Ahmad Raeissadat, Arash Babaei-Ghazani
Myofascial pain syndrome (MPS) is a common musculoskeletal disorder. This study was designed to compare the effects of aerobic exercise plus acupuncture with acupuncture alone in treatment of patients with MPS. Sixty four patients (55 female and 9 male) with myofascial pain syndrome in their neck and shoulders participated in the study with mean age of 33.1± 6.4. Participants were randomly allocated to aerobic exercise plus acupuncture (n = 32) or acupuncture alone (n = 32) groups. Outcome measurements included Visual Analog Scale (VAS), Pressure Pain Threshold (PPT), Neck Disability Index (NDI) and Quality of Life which was measured with QoL-SF36 scale...
May 7, 2018: Journal of Acupuncture and Meridian Studies
Koldobika Villelabeitia-Jaureguizar, Davinia Vicente-Campos, Alejandro Berenguel Senen, Verónica Verónica Hernández Jiménez, Lorena Lorena Ruiz Bautista, María Elvira Barrios Garrido-Lestache, Jose López Chicharro
BACKGROUND: Mechanical efficiency (ME) refers to the ability of an individual to transfer energy consumed by external work. A decreased ME, could represent an increased energy cost during exercise and may, therefore, be limited in terms of physical activity. This study aimed to compare the influence of two different exercise protocols: moderate continuous training (MCT) versus high intensity interval training (HIIT), as part of a cardiac rehabilitation program on ME values among coronary patients...
May 10, 2018: Cardiology Journal
John F Fitzpatrick, Kirsty M Hicks, Philip R Hayes
PURPOSE: The aim of this study was to compare the dose-response relationship between, traditional arbitrary speed thresholds versus an individualised approach, with changes in aerobic fitness in professional youth soccer players. METHODS: Fourteen youth soccer players, completed a 1500 metre time trial to estimate maximal aerobic speed (km.h-1 , (MAS)) at the start and the end of a six week period. Training load was monitored on a daily basis during this study. External load measures were; total distance covered (TD), total acceleration and deceleration distance > 2m...
May 10, 2018: International Journal of Sports Physiology and Performance
Matheus Hausen, Pedro Paulo Soares, Marcus Paulo Araujo, Débora Esteves, Hilbert Julio, Roberto Tauil, Marcus Junca, Flávia Porto, Emerson Franchini, Craig Alan Bridge, Jonas Gurgel
PURPOSE: The purpose of the present study was to propose and validate new taekwondo-specific cardiopulmonary exercise tests. METHODS: Twelve male national-level taekwondo athletes (age 20 ± 2 yrs; body mass 67.5 ± 5.7 kg; height 175 ± 8 cm; training experience 7 ± 3 yrs) performed three separate exercise tests in a randomized counterbalanced order: 1) a Treadmill Running Cardiopulmonary Exercise Test (CPET); 2) Continuous and 3) Interval Taekwondo Cardiopulmonary Exercise Tests (cTKDet and iTKDet, respectively)...
May 10, 2018: International Journal of Sports Physiology and Performance
Rochelle Rocha Costa, Ana Carolina Kanitz, Thais Reichert, Alexandre Konig Garcia Prado, Leandro Coconcelli, Adriana Cristine Koch Buttelli, Laura Frances Pereira, Marcos Paulo Bienert Masiero, Andressa Pellegrini Meinerz, Matheus Oliveira Conceição, Isadora Loch Sbeghen, Luiz Fernando Martins Kruel
The aim of the present study was to compare the effects of water-based aerobic training and water-based resistance training on muscular strength and cardiorespiratory fitness in older women. Sixty-nine individuals were randomized into the following three groups: the water-based aerobic training (WA, n = 23) group, the water-based resistance training (WR, n = 23) group, and the control group (CG, n = 23). Participants were trained two times per week for 10 weeks. The trainings presented a linear periodization with an increase in the volume-intensity relation...
May 3, 2018: Experimental Gerontology
Song Ya Li, Xue Ning Fei, Xiu Mei Jiao, Le Wang, Yan Jun Xing
Quorum sensing is a phenomenon that microorganisms secrete some signal molecules, when such molecules accumulate to a threshold level, which would realize the information communication by regulating specific gene expression. Quorum sensing, which is widely found in information communication of various microorganisms, regulates a variety of social behaviors, such as biofilm formation, public goods production, and gene horizontal transfer of bacteria. The phenomenon of quorum sensing is widespread in biological aggregates, such as activated sludge, biofilm and granular sludge...
March 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Boris Schmitz, Florian Rolfes, Katrin Schelleckes, Mirja Mewes, Lothar Thorwesten, Michael Krüger, Andreas Klose, Stefan-Martin Brand
Aim: MicroRNA-222 (miR-222) and miR-29c have been identified as important modulators of cardiac growth and may protect against pathological cardiac remodeling. miR-222 and -29c may thus serve as functional biomarkers for exercise-induced cardiac adaptations. This investigation compared the effect of two workload-matched high-intensity interval training (HIIT) protocols with different recovery periods on miR-222 and -29c levels. Methods: Sixty-three moderately trained females and males (22.0 ± 1.7 years) fulfilled the eligibility criteria and were randomized into two HIIT groups using sex and exercise capacity...
2018: Frontiers in Physiology
Eon Sook Lee, Yun Jun Yang, Jun Hyung Lee, Yeong Sook Yoon
Background: Ginseng has been used as an ergogenic agent, although evidence for its effectiveness is weak. A randomized, double-blind, placebo-controlled clinical trial was conducted to evaluate the effect of a ginsenoside complex (UG0712) on changes in exercise performance. Methods: Sedentary individuals ( n   =  117) were randomly assigned into one of three groups: low-dose ginsenoside supplementation (100 mg/d, n   =  39), high-dose ginsenoside supplementation (500 mg/d, n   =  39), or a placebo group (500 mg/d, n   =  39)...
April 2018: Journal of Ginseng Research
Aaron S Eisman, Ravi V Shah, Bishnu P Dhakal, Paul P Pappagianopoulos, Luke Wooster, Cole Bailey, Thomas F Cunningham, Kathryn M Hardin, Aaron L Baggish, Jennifer E Ho, Rajeev Malhotra, Gregory D Lewis
BACKGROUND: Single measurements of left ventricular filling pressure at rest lack sensitivity for identifying heart failure with preserved ejection fraction (HFpEF) in patients with dyspnea on exertion. We hypothesized that exercise hemodynamic measurements (ie, changes in pulmonary capillary wedge pressure [PCWP] indexed to cardiac output [CO]) may more sensitively differentiate HFpEF and non-HFpEF disease states, reflect aerobic capacity, and forecast heart failure outcomes in individuals with normal PCWP at rest...
May 2018: Circulation. Heart Failure
Nobuhiko Akazawa, Koichiro Tanahashi, Keisei Kosaki, Song-Gyu Ra, Tomoko Matsubara, Youngju Choi, Asako Zempo-Miyaki, Seiji Maeda
The brain's low resistance ensures a robust blood flow throughout systole and diastole and is susceptible to flow pulsatility. Increased cerebral pulsatility contributes to the progression of cerebrovascular disease. Although aerobic exercise affects vascular function, little is known about the effect of exercise on the cerebral pulsatility index in older adults. The aim of this study was to investigate the effect of exercise training on the post-exercise cerebral pulsatility response in older adults. Ten healthy older adults participated in a 12-week exercise training intervention...
April 2018: Physiological Reports
Anna Caroline Marques Braga, Anabela Pinto, Susana Pinto, Mamede de Carvalho
Introduction: The efficacy of cardiopulmonary exercise testing (CPET) to determining exercise intensity has not been established in Amyotrophic Lateral Sclerosis (ALS). We studied this intervention. Methods: We included 48 ALS patients randomized in 2 groups: G1 ( n = 24), exercise intensity leveled by CPET; G2 ( n = 24), standard care limited by fatigue, during 6 months. ALS functional scale (ALSFRS-R) and forced vital capacity (FVC) were performed every 3 months; CPET was done at admission ( T 1) and 6 months later ( T 2)...
2018: Neurology Research International
Xiaolong Wang, Yuegen Yan, Dawen Gao
Low-strength ammonium is still a challenge for the mainstream deammonification because of nitrate over-accumulation. In this study, the threshold of influent ammonium concentration of one-stage deammonification system with granular sludge was investigated, by stepwise decreasing influent ammonium from high concentrations (280mg/L to 140mg/L) to the low concentration (70mg/L) in 108d at 32°C without aeration. Results showed that, under 70mg/L NH4 + -N, ΔNO3 - -N/ΔNH4 + -N ratio increased to 0.2, deviated from the theoretical value of 0...
April 10, 2018: Science of the Total Environment
Liza Grosman-Rimon, Spencer D Lalonde, Nina Sieh, Maureen Pakosh, Vivek Rao, Paul Oh, Sherry L Grace
Exercise rehabilitation in heart failure patients has been shown to improve quality of life (QoL) and survival. It is also recommended in clinical practice guidelines for ventricular assist device (VAD) recipients. However, there have only been two meta-analyses on the effects of exercise rehabilitation in VAD patients, on only two outcomes. The objective of the review was to quantitatively evaluate the effect of exercise rehabilitation in VAD recipients on functional capacity, exercise physiology parameters, chronotropic responses, inflammatory biomarkers and neurohormones, heart structure and function, and clinical outcomes...
April 6, 2018: Heart Failure Reviews
Deepika Pal, Navjot Kaur, Sarabjeet Kour Sudan, Bhawana Bisht, Srinivasan Krishnamurthi, Shanmugam Mayilraj
A Gram-stain-negative, rod-shaped, aerobic, straw yellow, motile strain, designated KNDSW-TSA6T , belonging to the genus Acidovorax, was isolated from a water sample of the river Ganges, downstream of the city of Kanpur, Uttar Pradesh, India. Cells were aerobic, non-endospore-forming and motile with single polar flagella. It differed from its phylogenetically related strains by phenotypic characteristics such as hydrolysis of urea, gelatin, casein and DNA, and the catalase reaction. The major fatty acids were C16 : 1ω7c/C16 : 1ω6c, C16 : 0 and C18 : 1ω7c/C18 : 1ω6c...
April 4, 2018: International Journal of Systematic and Evolutionary Microbiology
Jaqueline Lourdes Rios, Kevin Rudi Boldt, James William Mather, Ruth Anne Seerattan, David Arthur Hart, Walter Herzog
BACKGROUND: Walking and running provide cyclical loading to the knee which is thought essential for joint health within a physiological window. However, exercising outside the physiological window, e.g. excessive cyclical loading, may produce loading conditions that could be detrimental to joint health and lead to injury and, ultimately, osteoarthritis. The purpose of this study was to assess the effects of a stepwise increase in speed and duration of treadmill training on knee joint integrity and to identify the potential threshold for joint damage...
April 2, 2018: Sports Medicine—Open
Rebecca Tronarp, André Nyberg, Mattias Hedlund, Charlotte K Häger, Suzanne McDonough, Martin Björklund
Aim: Establishing the effects of low intensity cycling (LC), moderate intensity cycling (MC), and standing at a simulated office workstation on pain modulation, work performance, and metabolic expenditure. Methods: 36 healthy adults (21 females), mean age 26.8 (SD 7.6) years, partook in this randomized 3 × 3 crossover trial with 75 minutes of LC on 20% of maximum aerobic power (MAP) output, 30 minutes of MC on 50% of MAP, and standing 30 minutes with 48-hour wash-out periods...
2018: BioMed Research International
Qiao Yang, Zhi-Wei Jiang, Cheng-Hui Huang, Ruo-Nan Zhang, Ling-Zhi Li, Guang Yang, Li-Juan Feng, Guang-Feng Yang, Heng Zhang, Xiao-Ling Zhang, Jun Mu
A Gram-stain negative, aerobic, rod-shaped, non-motile, yellow-pigmented and non-spore-forming bacterial strain, designated PM5-8T , was isolated from a culture of a marine toxigenic dinoflagellate Prorocentrum mexicanum PM01. Strain PM5-8T grew at 15-35 °C (optimum, 25-30 °C) and pH 6-11 (optimum, 7.5-8). Cells required at least 1.5% (w/v) NaCl for growth, and can tolerate up to 7.0% with the optimum of 4%. Phylogenetic analysis based on 16S rRNA gene sequence revealed that the strain PM5-8T is closely related to members of the genus Hoeflea, with high sequence similarities with Hoeflea halophila JG120-1T (97...
March 30, 2018: Antonie Van Leeuwenhoek
Anna Eden Ramos, Claire Lo, Leonard Estephan, Yi-Yin Tai, Ying Tang, Jingsi Zhao, Masataka Sugahara, John Gorcsan, Marcel G Brown, Daniel E Lieberman, Stephen Y Chan, Aaron Baggish
Circulating microRNAs (c-miRNAs) - plasma-based noncoding RNAs that control post-transcriptional gene expression - mediate processes that underlie phenotypic plasticity to exercise. The relationship and biologic relevance between c-miRNA expression and variable dose exercise exposure remain uncertain. We hypothesized that certain c-miRNAs respond to changes in exercise intensity and/or duration in a dose-dependent fashion. Muscle release of such c-miRNAs may then deplete intracellular stores, thus facilitating gene reprogramming and exercise adaptation...
March 30, 2018: American Journal of Physiology. Heart and Circulatory Physiology
Susan Marzolini, Dina Brooks, Paul Oh, David Jagroop, Bradley J MacIntosh, Nicole D Anderson, David Alter, Dale Corbett
BACKGROUND: Stroke is associated with muscle atrophy and weakness, mobility deficits, and cardiorespiratory deconditioning. Aerobic and resistance training (AT and RT) each have the potential to improve deficits, yet there is limited evidence on the utility of combined training. OBJECTIVE: To examine the effects of AT+RT versus AT on physiological outcomes in chronic stroke with motor impairments. METHODS: Participants (n = 73) were randomized to 6 months of AT (5 d/wk) or AT+RT (3 and 2 d/wk, respectively)...
March 2018: Neurorehabilitation and Neural Repair
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