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Recovery oxygen consumption in performance

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https://www.readbyqxmd.com/read/28194274/moderate-to-deep-sedation-technique-using-propofol-and-ketamine-allowing-synchronised-breathing-for-magnetic-resonance-high-intensity-focused-ultrasound-mr-hifu-treatment-for-uterine-fibroids-a-pilot-study
#1
Hermanus H B Vaessen, F M Knuttel, J M M van Breugel, M E Ikink, J M Dieleman, M A A J van den Bosch, J T A Knape
BACKGROUND: Magnetic resonance high-intensity focused ultrasound (MR-HIFU) treatment for uterine fibroids is rapidly gaining popularity as a treatment modality. This procedure is generally uncomfortable, painful, and requires minimal or absence of movement and an MR-HIFU synchronised breathing pattern of the patient. Procedural sedation and analgesia protocols have become the standard practice in interventional radiology departments worldwide. The aim of this study was to explore if a sedation regimen with low-dose propofol and ketamine performed by trained non-medical sedation practitioners could result in relief of discomfort for the patient and in adequate working conditions for MR-HIFU treatment for uterine fibroids...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28192833/energy-systems-contribution-in-the-running-based-anaerobic-sprint-test
#2
F Milioni, A M Zagatto, R A Barbieri, V L Andrade, J W Dos Santos, C A Gobatto, A S R da Silva, P R P Santiago, M Papoti
The aims of the present study were to verify the contributions of the energy systems during repeated sprints with a short recovery time and the associations of the time- and power-performance of repeated sprints with energetic contributions and aerobic and anaerobic variables. 13 healthy men performed the running-based anaerobic sprint test (RAST) followed by an incremental protocol for lactate minimum intensity determination. During the RAST, the net energy system was estimated using the oxygen consumption and the blood lactate responses...
February 13, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28179228/dietary-nitrate-does-not-reduce-oxygen-cost-of-exercise-or-improve-muscle-mitochondrial-function-in-mitochondrial-myopathy-patients
#3
Miranda Nabben, Joep P J Schmitz, Jolita Ciapaite, Carlijn M P Le Clercq, Natal A van Riel, Harm R Haak, Klaas Nicolay, Irenaeus F de Coo, Hubert J M Smeets, Stephan F Praet, Luc J C van Loon, Jeanine J Prompers
Muscle weakness and exercise intolerance negatively affect the quality of life of mitochondrial myopathy patients. Short-term dietary nitrate supplementation has been shown to improve exercise performance and reduce oxygen cost of exercise in healthy humans and trained athletes. We investigated if 1 week of dietary inorganic nitrate supplementation decreases the oxygen cost of exercise and improves mitochondrial function in mitochondrial myopathy patients. Ten mitochondrial myopathy patients (40 ± 5 years, maximal whole-body oxygen uptake = 21...
February 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28179195/multiplexed-mri-methods-for-rapid-estimation-of-global-cerebral-metabolic-rate-of-oxygen-consumption
#4
Hyunyeol Lee, Michael C Langham, Ana E Rodriguez-Soto, Felix W Wehrli
The global cerebral metabolic rate of oxygen (CMRO2), which reflects metabolic activity of the brain under various physiologic conditions, can be quantified using a method, referred to as 'OxFlow', which simultaneously measures hemoglobin oxygen saturation in a draining vein (Yv) and total cerebral blood flow (tCBF). Conventional OxFlow (Conv-OxFlow) entails four interleaves incorporated in a single pulse sequence - two for phase-contrast based measurement of tCBF in the supplying arteries of the neck, and two to measure the intra- to extravascular phase difference in the superior sagittal sinus to derive Yv [Jain et al...
February 6, 2017: NeuroImage
https://www.readbyqxmd.com/read/28150139/acute-effects-of-moderate-continuous-training-on-stress-test-related-pulse-pressure-and-wave-reflection-in-healthy-men
#5
Florian Milatz, Sascha Ketelhut, Reinhard G Ketelhut
INTRODUCTION: Arterial dysfunction develops early in life even in individuals with modest cardiovascular risk. Stress is associated with increased risk in cardiovascular morbidity and mortality. AIM: The main objectives of this study were to investigate the acute effects of moderate continuous training (MCT) on established markers of arterial stiffness and cardiovascular risk during standardized cold pressor stress testing (CPT). METHODS: 29 young healthy male subjects (33...
February 2, 2017: High Blood Pressure & Cardiovascular Prevention: the Official Journal of the Italian Society of Hypertension
https://www.readbyqxmd.com/read/28121183/betalain-rich-concentrate-supplementation-improves-exercise-performance-and-recovery-in-competitive-triathletes
#6
RANDOMIZED CONTROLLED TRIAL
Cristhian F Montenegro, David A Kwong, Zev A Minow, Brian A Davis, Christina F Lozada, Gretchen A Casazza
We aimed to determine the effects of a betalain-rich concentrate (BRC) of beetroots, containing no sugars or nitrates, on exercise performance and recovery. Twenty-two (9 men and 13 women) triathletes (age, 38 ± 11 years) completed 2 double-blind, crossover, randomized trials (BRC and placebo) starting 7 days apart. Each trial was preceded by 6 days of supplementation with 100 mg·day(-1) of BRC or placebo. On the 7th day of supplementation, exercise trials commenced 120 min after ingestion of 50 mg BRC or placebo and consisted of 40 min of cycling (75 ± 5% maximal oxygen consumption) followed by a 10-km running time trial (TT)...
February 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28104245/assessing-kinematics-and-kinetics-of-functional-electrical-stimulation-rowing
#7
Adina E Draghici, Glen Picard, J Andrew Taylor, Sandra J Shefelbine
Hybrid functional electrical stimulation (FES) rowing has positive effects on cardiovascular fitness, producing significantly greater aerobic power than either upper body or FES exercise alone. However, there is minimal information on the kinematics, kinetics, and mechanical efficiency of FES-rowing in the spinal cord injured (SCI) population. This study examined the biomechanics of FES-rowing to determine how motions, forces, and aerobic demand change with increasing intensity. Six individuals with SCI and six able-bodied subjects performed a progressive aerobic capacity rowing test...
January 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28017395/left-atrial-function-dynamics-during%C3%A2-exercise-in-heart-failure-pathophysiological-implications-on-the-right-heart-and-exercise-ventilation-inefficiency
#8
Tadafumi Sugimoto, Francesco Bandera, Greta Generati, Eleonora Alfonzetti, Claudio Bussadori, Marco Guazzi
OBJECTIVES: The hypothesis of this study was that left atrial (LA) dynamic impairment during exercise may trigger right ventricular (RV)-to-pulmonary circulation (PC) uncoupling and ventilation inefficiency. BACKGROUND: LA function plays a key role in the hemodynamics of heart failure with reduced ejection fraction (HFrEF) and heart failure with preserved ejection fraction (HFpEF). Extensive investigation of LA dynamics, however, has been performed exclusively at rest...
December 12, 2016: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/27890482/dietary-nitrate-does-not-affect-physical-activity-or-outcomes-in-healthy-older-adults-in-a-randomized-cross-over-trial
#9
Mario Siervo, Clio Oggioni, Djordje G Jakovljevic, Michael Trenell, John C Mathers, David Houghton, Carlos Celis-Morales, Ammar W Ashor, Alan Ruddock, Mayur Ranchordas, Markos Klonizakis, Elizabeth A Williams
Although dietary nitrate (NO3(-)) ingestion appears to enhance exercise capacity and performance in young individuals, inconclusive findings have been reported in older people. Therefore, we conducted a double-blind, crossover randomized clinical trial using beetroot juice in older healthy participants, who were classified as normal weight and overweight. We tested whether consumption of beetroot juice (a rich source of NO3(-)) for 1 week would increase nitric oxide bioavailability via the nonenzymatic pathway and enhance (1) exercise capacity during an incremental exercise test, (2) physical capability, and (3) free-living physical activity...
December 2016: Nutrition Research
https://www.readbyqxmd.com/read/27846044/impact-of-exercise-intensity-and-duration-on-postexercise-executive-function
#10
Hayato Tsukamoto, Saki Takenaka, Tadashi Suga, Daichi Tanaka, Tatsuya Takeuchi, Takafumi Hamaoka, Tadao Isaka, Takeshi Hashimoto
PURPOSE: The impact of exercise volume represented by exercise intensity and duration on post-exercise executive function (EF) improvement remains unclear. In the present study, involving 2 volume-controlled evaluations, we aimed to compare acute exercise protocols with differing intensities and durations in order to establish an effective exercise protocol for improving EF. METHODS: In study 1, 12 healthy male subjects performed cycle ergometer exercise, based on a low-intensity (LI) protocol for 20 min (LI20), moderate-intensity (MI) protocol for 20 min (MI20), and MI20 volume-matched LI protocol for 40 min (LI40)...
November 11, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27825150/oxygen-uptake-recovery-kinetics-after-the-6-minute-walk-test-in-patients-with-chronic-obstructive-pulmonary-disease
#11
Florent Baty, Arnoldus J R van Gestel, Lukas Kern, Martin H Brutsche
BACKGROUND: There is a growing interest in exercise parameters capable of objectively evaluating the functional capacity of patients with chronic obstructive pulmonary disease (COPD). OBJECTIVES: The purpose of the present study was to analyze breath-by-breath cardiopulmonary and gas exchange recovery responses of patients with COPD after a 6-minute walk test (6MWT). METHODS: Oxygen uptake (VO2) kinetics of patients were obtained using mobile telemetric cardiopulmonary monitoring during and after a 6MWT...
2016: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/27825073/mechanical-energy-patterns-in-nordic-walking-comparisons-with-conventional-walking
#12
Barbara Pellegrini, Leonardo Alexandre Peyré-Tartaruga, Chiara Zoppirolli, Lorenzo Bortolan, Aldo Savoldelli, Alberto Enrico Minetti, Federico Schena
The use of poles during Nordic Walking (NW) actively engages the upper body to propel the body forward during walking. Evidence suggests that NW leads to a longer stride and higher speed, and sometimes to increased ground reaction forces with respect to conventional walking (W). The aim of this study was to investigate if NW is associated with different changes in body centre of mass (COM) motion and limbs energy patterns, mechanical work and efficiency compared to W. Eight experienced Nordic Walkers performed 5-min W and NW trials on a treadmill at 4kmh(-1)...
January 2017: Gait & Posture
https://www.readbyqxmd.com/read/27794485/noninvasive-ventilation-before-maximum-exercise-test-increases-exercise-tolerance-in-subjects-with-heart-failure-a-crossover-study
#13
Larissa de Andrade Carvalho, Daniella Cunha Brandão, Shirley Lima Campos, Tainá Maria de Souza Vidal, Maria Inês Remígio, Sílvia Marinho Martins, Armèle Dornelas de Andrade
OBJECTIVE: To evaluate the effect of noninvasive ventilation (NIV) on exercise performance in individuals with heart failure (HF). DESIGN: Crossover, blind, randomized controlled trial with allocation concealment. SETTING: University-based research laboratory. PARTICIPANTS: Participants (N=24) with New York Heart Association class II and III left heart failure and with a mean age of 51.8±10.2 years (women: n=8; men: n=16)...
October 26, 2016: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/27791076/urban-point-sources-of-nutrients-were-the-leading-cause-for-the-historical-spread-of-hypoxia-across-european-lakes
#14
Jean-Philippe Jenny, Alexandre Normandeau, Pierre Francus, Zofia Ecaterina Taranu, Irene Gregory-Eaves, François Lapointe, Josue Jautzy, Antti E K Ojala, Jean-Marcel Dorioz, Arndt Schimmelmann, Bernd Zolitschka
Enhanced phosphorus (P) export from land into streams and lakes is a primary factor driving the expansion of deep-water hypoxia in lakes during the Anthropocene. However, the interplay of regional scale environmental stressors and the lack of long-term instrumental data often impede analyses attempting to associate changes in land cover with downstream aquatic responses. Herein, we performed a synthesis of data that link paleolimnological reconstructions of lake bottom-water oxygenation to changes in land cover/use and climate over the past 300 years to evaluate whether the spread of hypoxia in European lakes was primarily associated with enhanced P exports from growing urbanization, intensified agriculture, or climatic change...
October 24, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27777059/metabolic-mechanisms-of-vocal-fatigue
#15
Chayadevie Nanjundeswaran, Jessie VanSwearingen, Katherine Verdolini Abbott
OBJECTIVE: This study aimed to identify potential metabolic mechanisms including (1) neuromuscular inefficiency, (2) cardiovascular recovery deficits, or (3) both, in individuals with complaints of vocal fatigue. STUDY DESIGN: Within- and between-subjects group design was used in this study. METHODS: Three groups of women participated in the study, including (1) individuals with complaints of vocal fatigue; (2) vocally healthy sedentary individuals; and (3) vocally healthy, cardiovascularly conditioned individuals...
October 21, 2016: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/27761168/autonomic-and-cardio-respiratory-responses-to-exercise-in-brugada-syndrome-patients
#16
Raoyrin Chanavirut, Pattarapong Makarawate, Ian A Macdonald, Naruemon Leelayuwat
BACKGROUND: Imbalances of the autonomic nervous (ANS), the cardiovascular system, and ionics might contribute to the manifestation of The Brugada Syndrome (BrS). Thus, this study has aimed to investigate the cardio-respiratory fitness and the responses of the ANS both at rest and during a sub-maximal exercise stress test, in BrS patients and in gender-matched and age-matched healthy sedentary controls. METHODS: Eleven BrS patients and 23 healthy controls were recruited in Khon Kaen, Thailand...
October 2016: Journal of Arrhythmia
https://www.readbyqxmd.com/read/27673449/limitations-in-intense-exercise-performance-of-athletes-effect-of-speed-endurance-training-on-ion-handling-and-fatigue-development
#17
Morten Hostrup, Jens Bangsbo
Mechanisms underlying fatigue development and limitations for performance during intense exercise have been intensively studied during the past couple of decades. Fatigue development may involve several interacting factors and depends on type of exercise undertaken and training level of the individual. Intense exercise (½-6 min) causes major ionic perturbations (Ca(2+) , Cl(-) , H(+) , K(+) , lactate(-) , and Na(+) ) that may reduce sarcolemmal excitability, Ca(2+) release, and force production of skeletal muscle...
September 27, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27547668/effects-of-various-acute-hypoxic-conditions-on-metabolic-parameters-and-cardiac-function-during-exercise-and-recovery
#18
Hwang-Woon Moon, Sub Sunoo, Hun-Young Park, Dong-Jun Lee, Sang-Seok Nam
PURPOSE: Evaluation of metabolic parameters and cardiac function is important to determine the decrease in aerobic exercise capacity under hypoxic conditions. However, the variations in metabolic parameters and cardiac function and the reasons for the decrease in aerobic exercise capacity under hypoxic conditions have not been clearly explained. The purpose of this study was to compare the responses between sea level and various acute normobaric hypoxic conditions on metabolic parameters and cardiac function during exercise and recovery in order to evaluate aerobic exercise capacity...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27537411/acute-responses-to-resistance-and-high-intensity-interval-training-in-adolescents
#19
Nigel Harris, Deborah Dulson, Greig Logan, Isaac Warbrick, Fabrice Merien, David Lubans
The purpose of this study was to compare the acute physiological responses within and between resistance training (RT) and high intensity interval training (HIIT) matched for time and with comparable effort, in a school setting. Seventeen early adolescents (12.9 ± 0.3 y) performed both RT (2-5 repetitions perceived short of failure at the end of each set) and HIIT (90% of age predicted maximum heart rate), equated for total work set and recovery period durations comprising of 12 'sets' of 30 s work followed by 30 s recovery (total session time 12 min)...
August 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27494645/microwave-treatment-of-dairy-manure-for-resource-recovery-reaction-kinetics-and-energy-analysis
#20
Asha Srinivasan, Ping H Liao, Kwang V Lo
A newly designed continuous-flow 915 MHz microwave wastewater treatment system was used to demonstrate the effectiveness of the microwave enhanced advanced oxidation process (MW/H2O2-AOP) for treating dairy manure. After the treatment, about 84% of total phosphorus and 45% of total chemical oxygen demand were solubilized with the highest H2O2 dosage (0.4% H2O2 per %TS). The reaction kinetics of soluble chemical oxygen demand revealed activation energy to be in the range of 5-22 kJ mole(-1). The energy required by the processes was approximately 0...
December 2016: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
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