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Recovery oxygen consumption in performance

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
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
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
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
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
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...
August 5, 2016: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
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
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
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
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
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
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
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
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
Anna Laura Eusebi, Maximiliano Panigutti, Paolo Battistoni
Alternating oxic/anoxic process, applied for the main objective of the improvement of nitrogen performances, was studied in terms of secondary effect of biomass reduction. The process was carried out in one real water resource recovery facility and the data were compared with the previous conventional period when a conventional process was adopted. The main mechanism of the process for the sludge minimization is recognized in the metabolic uncoupling. In fact, an increase of the specific oxygen uptake rate in the biological reactor was recorded stimulated by the change of the oxidation reduction potential environment...
June 2016: Water Environment Research: a Research Publication of the Water Environment Federation
Paulo Cesar do Nascimento Salvador, Rafael Alves de Aguiar, Anderson Santiago Teixeira, Kristopher Mendes de Souza, Ricardo Dantas de Lucas, Benedito Sérgio Denadai, Luiz Guilherme Antonacci Guglielmo
The aim of this study was to investigate the effect of prior exercise on the heart rate (HR) and oxygen uptake (VO2) off-kinetics after a subsequent high-intensity running exercise. Thirteen male futsal players (age 22.8±6.1years) performed a series of high-intensity bouts without prior exercise (control), preceded by a prior same intensity continuous exercise (CE+CE) and a prior sprint exercise (SE+CE). The magnitude of excess post-exercise oxygen consumption (EPOCm-4.25±0.19 vs. 3.69±0.20Lmin(-1) in CE+CE and 3...
August 2016: Respiratory Physiology & Neurobiology
Nasrin Rahmani, Afshin Gholipour Baradari, Seyed Mohammad-Javad Heydari Yazdi, Abolfazl Firouzian, Seyyed Abbas Hashemi, Mehran Fazli, Iman Sadeghian
BACKGROUNDS: Various methods were defined to prepare patients for the pilonidal sinus surgery including local, spinal, and general anesthesia. But there is no powerful evidence to differ these procedures. Therefore, in the current study, we compared local and general anesthesia in the pilonidal sinus surgery. METHODS & MATERIAL: in this clinical trial (IRCT201312031786N5) study 60 patients with the pilonidal sinus disease divided to two groups of local anesthesia versus general anesthesia...
2016: Global Journal of Health Science
Seongjin Choi, David A Reiter, Michelle Shardell, Eleanor M Simonsick, Stephanie Studenski, Richard G Spencer, Kenneth W Fishbein, Luigi Ferrucci
BACKGROUND: Aerobic fitness and muscle bioenergetic capacity decline with age; whether such declines explain age-related slowing of walking speed is unclear. We hypothesized that muscle energetics and aerobic capacity are independent correlates of walking speed in simple and challenging performance tests and that they account for the observed age-related decline in walking speed in these same tests. METHODS: Muscle bioenergetics was assessed as postexercise recovery rate of phosphocreatine (PCr), k PCr, using phosphorus magnetic resonance spectroscopy ((31)P-MRS) in 126 participants (53 men) of the Baltimore Longitudinal Study of Aging aged 26-91 years (mean = 72 years)...
April 13, 2016: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
A Patrician, E Schagatay
Breath-hold divers train to minimize their oxygen consumption to improve their apneic performance. Dietary nitrate has been shown to reduce the oxygen cost in a variety of situations, and our aim was to study its effect on arterial oxygen saturation (SaO2 ) after dynamic apnea (DYN) performance. Fourteen healthy male apnea divers (aged 33 ± 11 years) received either 70 mL of concentrated nitrate-rich beetroot juice (BR) or placebo (PL) on different days. At 2.5 h after ingesting the juice, they were asked to perform 2 × 75 m DYN dives in a pool with 4...
March 31, 2016: Scandinavian Journal of Medicine & Science in Sports
Portia B Resnick
INTRODUCTION: Postexercise massage can be used to help promote recovery from exercise on the cellular level, as well as systemically by increasing parasympathetic activity. No studies to date have been done to assess the effects of massage on postexercise metabolic changes, including excess postexercise oxygen consumption (EPOC). The purpose of this study was to compare the effects of massage recovery and resting recovery on a subject's heart rate variability and selected metabolic effects following a submaximal treadmill exercise session...
March 2016: International Journal of Therapeutic Massage & Bodywork
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