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Recovery oxygen consumption in performance

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https://www.readbyqxmd.com/read/27890482/dietary-nitrate-does-not-affect-physical-activity-outcomes-in-health-older-adults-in-a-randomized-crossover-trial
#1
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...
November 14, 2016: Nutrition Research
https://www.readbyqxmd.com/read/27846044/impact-of-exercise-intensity-and-duration-on-postexercise-executive-function
#2
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
#3
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
#4
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/non-invasive-ventilation-before-maximum-exercise-test-increases-exercise-tolerance-in-subjects-with-heart-failure-a-crossover-study
#5
Larissa de Andrade Carvalho, Daniella Cunha Brandão, Tainá Maria de Souza Vidal, Maria Inês Remígio, Sílvia Marinho, Armèle Dornelas de Andrade
OBJECTIVES: To evaluate the effect of non-invasive ventilation (NIV) on exercise performance in individuals with heart failure (HF). DESIGN: Crossover, randomized, blind clinical trial with allocation concealment. SETTING: University-based research laboratory. PARTICIPANTS: 8 women and 16 men with New York Heart Association class II-III left heart failure between the ages of 51.8 ± 10.2 years. INTERVENTIONS: Ventilatory support was administered at two pressure levels for 30 minutes attached to the face of the individual via a facemask prior to Cardiopulmonary Exercise Test (CPET)...
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
https://www.readbyqxmd.com/read/27430558/effect-of-acupuncture-and-instruction-on-physiological-recovery-from-maximal-exercise-a-balanced-placebo-controlled-trial
#13
Paola Urroz, Ben Colagiuri, Caroline A Smith, Alan Yeung, Birinder S Cheema
BACKGROUND: This study aimed to investigate the effect of acupuncture administered immediately following a graded exercise test (GXT) on physiological measures of recovery and determine if instruction (expectancy) affected the responses. METHODS: A balanced-placebo 2 × 2 factorial design was used with treatment (real vs placebo acupuncture) and instruction (told real vs told placebo acupuncture) as factors; a no-treatment control group was also included to compare the treatment responses to no treatment...
2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27409333/does-the-incremental-shuttle-walk-test-require-maximal-effort-in-young-obese-women
#14
S P Jürgensen, R Trimer, L Di Thommazo-Luporini, V Z Dourado, J C Bonjorno-Junior, C R Oliveira, R Arena, A Borghi-Silva
Obesity is a chronic disease with a multifaceted treatment approach that includes nutritional counseling, structured exercise training, and increased daily physical activity. Increased body mass elicits higher cardiovascular, ventilatory and metabolic demands to varying degrees during exercise. With functional capacity assessment, this variability can be evaluated so individualized guidance for exercise training and daily physical activity can be provided. The aim of the present study was to compare cardiovascular, ventilatory and metabolic responses obtained during a symptom-limited cardiopulmonary exercise test (CPX) on a treadmill to responses obtained by the incremental shuttle walk test (ISWT) in obese women and to propose a peak oxygen consumption (VO2) prediction equation through variables obtained during the ISWT...
July 11, 2016: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/27311376/a-novel-combination-technique-of-cold-crystalloid-perfusion-but-not-cold-storage-facilitates-transplantation-of-canine-hearts-donated-after-circulatory-death
#15
Franklin Rosenfeldt, Ruchong Ou, Robert Salamonsen, Silvana Marasco, Adam Zimmet, Joshua Byrne, Filip Cosic, Pankaj Saxena, Donald Esmore
BACKGROUND: Donation after circulatory death (DCD) represents a potential new source of hearts to increase the donor pool. We showed previously that DCD hearts in Greyhound dogs could be resuscitated and preserved by continuous cold crystalloid perfusion but not by cold static storage and could demonstrate excellent contractile and metabolic function on an in vitro system. In the current study, we demonstrate that resuscitated DCD hearts are transplantable. METHODS: Donor Greyhound dogs (n = 12) were divided into perfusion (n = 8) and cold static storage (n = 4) groups...
April 1, 2016: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/27295199/impact-of-a-motivated-performance-task-on-autonomic-and-hemodynamic-cardiovascular-reactivity
#16
Ross W May, Marcos A Sanchez-Gonzalez, Gregory S Seibert, John S Samaan, Frank D Fincham
Motivated performance (MP) tasks include mental stressors characterized by a high degree of motivation, individual engagement, and sympathetic overstimulation. It is therefore important to document the independent influence of motivation apart from engagement on markers of cardiovascular autonomic modulation, including vasomotor tone (low-frequency systolic blood pressure, LFSBP), blood pressure homeostasis (baroreflex sensitivity, BRS), and myocardial oxygen consumption (rate pressure product, RPP). Accordingly, an arithmetic task (AT) was used to manipulate motivation to evaluate its impact on cardiovascular reactivity...
May 2016: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/27293507/oxygen-consumption-and-substrate-utilization-during-and-after-resistance-exercises-performed-with-different-muscle-mass
#17
Paulo Farinatti, Antonio G Castinheiras Neto, Paulo R S Amorim
This study investigated the energy expenditure (EE) and substrate utilization reflected by the respiratory-exchange ratio (RER) during and after resistance exercises performed with different muscle mass. Ten male volunteers (mean±SD; 26±4yr, 179±6cm, 77±8kg) performed multiple sets of the horizontal leg press (LP) and chest fly (CF) (5 sets of 10 repetitions with 15 repetition-maximum, 1-minute between-set intervals) in a counterbalanced design. Oxygen uptake and carbon dioxide production were measured during 40 minutes of resting; resistance exercise protocols (sets and intervals); 90 minutes of post-exercise recovery...
2016: International Journal of Exercise Science
https://www.readbyqxmd.com/read/27274656/cardiorespiratory-effects-of-one-legged-high-intensity-interval-training-in-normoxia-and-hypoxia-a-pilot-study
#18
Verena Menz, Mona Semsch, Florian Mosbach, Martin Burtscher
A higher-than-average maximal oxygen consumption (VO2max), is closely associated with decreased morbidity and mortality and improved quality of life and acts as a marker of cardiorespiratory fitness. Although there is no consensus about an optimal training method to enhance VO2max, nevertheless training of small muscle groups and repeated exposure to hypoxia seem to be promising approaches. Therefore, this study was aimed at gaining innovative insights into the effects of small muscle group training in normoxia and hypoxia...
June 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27267551/long-term-effects-of-physical-exercise-during-rehabilitation-in-patients-with-severe-burns
#19
Paul Wurzer, Charles D Voigt, Robert P Clayton, Clark R Andersen, Ronald P Mlcak, Lars-P Kamolz, David N Herndon, Oscar E Suman
BACKGROUND: We have reported that a 12-week exercise program is beneficial for the exercise performance of severely burned children. It is not known, however, whether the beneficial effects remain at 2 years postburn. METHODS: Severely burned children who received no long-term anabolic drugs were consented to this Institutional Review Board-approved study. Patients chose between a voluntary exercise program (EX-group) and no exercise (NoEX-group) after discharge from the acute burn unit...
September 2016: Surgery
https://www.readbyqxmd.com/read/27236070/comparison-of-1-versus-3-minute-stage-duration-during-arm-ergometry-in-individuals-with-spinal-cord-injury
#20
Jennifer L Maher, Rachel E Cowan
OBJECTIVE: To investigate the effect of stage duration on peak physiological response to arm ergometry incremental exercise testing in individuals with spinal cord injury or disease (SCI/D) in support of developing a more individualized approach to testing. DESIGN: Parallel reliability study. SETTING: University research laboratory. PARTICIPANTS: Individuals with SCI/D (N=38) performed 2 peak oxygen consumption assessments comprised of 1-minute or 3-minute stages on 1 day...
May 25, 2016: Archives of Physical Medicine and Rehabilitation
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