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Stephanie L Bond, Persephone Greco-Otto, Raymond Sides, Grace P S Kwong, Renaud Leguillette, Warwick M Bayly
A prospective, randomised, controlled study was designed to determine relative aerobic and anaerobic (lactic and alactic) contributions at supramaximal exercise intensities using 2 different methods. Thoroughbred racehorses (n=5) performed a V̇O2max test and 3 supramaximal treadmill runs (105%, 115% and 125%V̇O2max ). Blood lactate concentration (BL) was measured at rest, every 15s during runs, and 2, 5, 10, 20, 30, 40, 50 and 60mins post-exercise. Method 1: Oxygen demand was calculated for each supramaximal intensity based on the V̇O2max test, and relative aerobic and anaerobic contributions were calculated from measured V̇O2 and the accumulated oxygen deficit...
February 14, 2019: Journal of Applied Physiology
Isabella Dos Santos Alves, Carlos Augusto Kalva-Filho, Rodrigo Aquino, Leonardo Travitzki, Alessandro Tosim, Marcelo Papoti, Márcio Pereira Morato
Our aims were to compare physiological parameters from the laboratory environment (LaB) and simulated goalball games (GaM), test relationships between physiological parameters in the laboratory and game technical performance (GTP), and examine the associations between physiological and technical responses during games. Seven elite athletes from the Brazilian National Team performed in LaB environment; (i) an incremental test to determine peak oxygen consumption (O2PEAK ), its corresponding speed, and peak blood lactate concentration and (ii) submaximal and supramaximal efforts to estimate maximal anaerobic contribution (AnC)...
2018: Frontiers in Physiology
Daniela Ciprandi, Nicola Lovecchio, Marco Piacenza, Eloisa Limonta, Fabio Esposito, Chiarella Sforza, Matteo Zago
Ciprandi, D, Lovecchio, N, Piacenza, M, Limonta, E, Esposito, F, Sforza, C, Zago, M. Energy cost of continuous shuttle running: Comparison of 4 measurement methods. J Strength Cond Res 32(8): 2265-2272, 2018-Assessing runs with frequent turns (shuttle run) is a viable option to evaluate the energy cost associated with sport-specific high-intensity intermittent activities. To date, no study investigated the extent to which the computation of energy cost of exercise is affected by the following factors: procedure and duration of oxygen uptake measurement during exercise, oxygen uptake measurement during recovery, estimation of the anaerobic alactic contribution, consideration of respiratory exchange ratio (RER) in the computation, and exercise intensity...
August 2018: Journal of Strength and Conditioning Research
Matteo Zago, Fabio Esposito, Giulia Rausa, Eloisa Limonta, Felice Corrado, Susanna Rampichini, Chiarella Sforza
Changes of direction (CoDs) have a high metabolic and mechanical impact in field and court team sports, but the estimation of the associated workload is still inaccurate. This study aims at validating an algorithm based on kinematic data to estimate the energy cost of running with frequent 180°-CoDs. Twenty-six physically active male subjects (22.4 ± 3.2 years) participated in two sessions: (1) maximum oxygen uptake (V̇O2,max ) and maximal aerobic speed (MAS) test; (2) 5-m continuous shuttle run (two 5-min trials at 50% and 75% MAS, 6-min recovery)...
July 25, 2018: Journal of Biomechanics
Woo-Hwi Yang, Oliver Heine, Marijke Grau
In combat sports such as taekwondo (TKD), athletes rapidly reduce body weight to achieve a desired weight category. Competition takes place 16-24 h after weigh-in and thus, the recovery time is an important factor for competition performance. The purpose of this study was to investigate the impact of rapid weight reduction (RWR) on athletic performance and associated hemorheological properties considering relevant recovery time. Five male TKD athletes reduced body weight by 5% within 3½ days. A simulated competition day (SCD) was carried out after a 16 h recovery period...
2018: PloS One
Ionas Papassotiriou, Artemissia-Phoebe Nifli
Introduction: Although regular training introduces the desired changes in athletes' metabolism towards optimal final performance, literature is rarely focusing on the metabolic responses off-competition. Therefore, the aim of this study was to evaluate biochemical indices during typical preseason training in wrestling athletes. Materials and methods: Twenty male freestyle and Greco-roman wrestlers (14 to 31 years) followed a typical session of the preparatory phase...
June 15, 2018: Biochemia Medica: časopis Hrvatskoga Društva Medicinskih Biokemičara
Miguel S Conceição, Arthur F Gáspari, Ana P B Ramkrapes, Edson M M Junior, Romulo Bertuzzi, Cláudia R Cavaglieri, Mara Patrícia T Chacon-Mikahil
PURPOSE: We investigated the energy system contributions and total energy expenditure during low intensity endurance exercise associated with blood flow restriction (LIE-BFR) and without blood flow restriction (LIE). METHODS: Twelve males participated in a contra-balanced, cross-over design in which subjects completed a bout of low-intensity endurance exercise (30min cycling at 40% of [Formula: see text]) with or without BFR, separated by at least 72 hours of recovery...
2018: PloS One
Philippe Hellard, Robin Pla, Ferran A Rodríguez, David Simbana, David B Pyne
PURPOSE: To compare the dynamics of maximal oxygen uptake ([Formula: see text]), blood lactate ([La]b ), total energy expenditure (Etot ), and contributions of the aerobic (Eaer ), alactic anaerobic (Ean,al ), and lactic anaerobic (Ean,lac ) metabolic energy pathways over 4 consecutive 25-m laps (L0-25 , L25-50 , etc) of a 100-m maximal freestyle swim. METHODS: Elite swimmers comprising 26 juniors (age = 16 [1] y) and 23 seniors (age = 24 [5] y) performed 100 m at maximal speed and then 3 trials (25, 50, and 75 m) at the same pace as that of the 100 m...
September 1, 2018: International Journal of Sports Physiology and Performance
Suwannee Phumeetham, Nujaree Kaowchaweerattanachart, Suvikrom Law, Prakul Chanthong, Busadee Pratumvinit
BACKGROUND: Arterial lactate (aLact) has been widely used to guide therapeutic decisions in children with shock. We evaluated the feasibility of central venous lactate (cvLact) in assessing aLact among children with shock. METHODS: Pairs of arterial and central venous samples for lactate concentrations were collected simultaneously during the shock and hemodynamically stable states. The results were analyzed by using a Cobas 8000 analyzer. RESULTS: Sixty-four blood paired samples were collected from 48 patients...
September 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
C A Kalva-Filho, E Z Campos, V L Andrade, Asr Silva, A M Zagatto, McS Lima, M Papoti
The aims of the present study were to investigate the relationship of aerobic and anaerobic parameters with 400 m performance, and establish which variable better explains long distance performance in swimming. Twenty-two swimmers (19.1±1.5 years, height 173.9±10.0 cm, body mass 71.2±10.2 kg; 76.6±5.3% of 400 m world record) underwent a lactate minimum test to determine lactate minimum speed (LMS) (i.e., aerobic capacity index). Moreover, the swimmers performed a 400 m maximal effort to determine mean speed (S400m), peak oxygen uptake ([Formula: see text]) and total anaerobic contribution (CANA)...
December 2015: Biology of Sport
Yan-Yan Li, Yin Xiang, Song Zhang, Yan Wang, Jie Yang, Wei Liu, Feng-Tai Xue
The aim of this study is to examine the role of thioredoxin-2 (Trx2) in autophagy and apoptosis during myocardial ischemia-reperfusion (I/R) injury in vitro. We employed the oxygen-glucose deprivation and reperfusion (OGD/R) model of H9c2 cells and used lentiviral infection to overexpress Trx2. H9c2 cell viability and injury assays were conducted using a Cell Counting Kit-8 (CCK-8) and alactate dehydrogenase (LDH) kit. The effects of Trx2 on autophagy and apoptosis were measured by transmission electron microscopy (TEM), western blot, and flow cytometry...
2017: American Journal of Translational Research
Rômulo Bertuzzi, Jorge Melegati, Salomão Bueno, Thaysa Ghiarone, Leonardo A Pasqua, Arthur Fernandes Gáspari, Adriano E Lima-Silva, Alfredo Goldman
PURPOSE: The aim of the current study is to describe the functionality of free software developed for energy system contributions and energy expenditure calculation during exercise, namely GEDAE-LaB. METHODS: Eleven participants performed the following tests: 1) a maximal cycling incremental test to measure the ventilatory threshold and maximal oxygen uptake (V̇O2max); 2) a cycling workload constant test at moderate domain (90% ventilatory threshold); 3) a cycling workload constant test at severe domain (110% V̇O2max)...
2016: PloS One
Josianne Rodrigues-Krause, Mauricio Krause, Álvaro Reischak-Oliveira
When attempting to ascertain dancers' fitness levels, essential parameters, such as aerobic and anaerobic capacity, muscular power and strength, flexibility, and body composition, must be considered. Dance is characterized as an intermittent type of exercise, demanding energy from different metabolic pathways (aerobic and anaerobic, lactic or alactic). A dancer's maximum aerobic capacity (ranging from 37 to 57 ml·kg(-1)·min(-1)) is related to his or her dance style, gender, level of technical ability, and status in a dance company...
September 2015: Journal of Dance Medicine & Science
Gabriel Motta Pinheiro Brisola, Willian Eiji Miyagi, Henrique Santos da Silva, Alessandro Moura Zagatto
The aim of the study was to investigate the effects of acute supplementation of sodium bicarbonate (NaHCO3) on maximal accumulated oxygen deficit (MAOD) determined by a single supramaximal effort (MAODALT) in running and the correlation with 200- and 400-m running performances. Fifteen healthy men (age, 23 ± 4 years; maximal oxygen uptake, 50.6 ± 6.1 mL·kg(-1)·min(-1)) underwent a maximal incremental exercise test and 2 supramaximal efforts at 110% of the intensity associated with maximal oxygen uptake, which was carried out after ingesting either 0...
September 2015: Applied Physiology Nutrition and Metabolism
S K Learsi, V J Bastos-Silva, A E Lima-Silva, R Bertuzzi, G G De Araujo
The aim of this study was to determine the ergogenic effects of metformin in high-intensity exercise, as well as its effects on anaerobic capacity, in healthy and physically active men. Ten subjects (mean (± standard deviation) maximal oxygen uptake (V˙O2max ) 38.6 ± 4.5 mL/kg per min) performed the following tests in a cycle ergometer: (i) an incremental test; (ii) six submaximal constant workload tests at 40%-90% (V˙O2max ); and (iii) two supramaximal tests (110% (V˙O2max ). Metformin (500 mg) or placebo was ingested 60 min before the supramaximal test...
October 2015: Clinical and Experimental Pharmacology & Physiology
Roma Aleksandraviciene, Kristina Zaicenkoviene, Loreta Stasiule, Arvydas Stasiulis
This study investigated the aerobic fitness and physiologic and energetic responses during competitive exercise in aerobic gymnasts. The gymnasts performed a graded treadmill test and competitive group exercises. Energetic response was calculated from oxygen uptake and blood lactate changes. Peak oxygen uptake was similar in International (M = 45.4 ml · kg(-1) · min.(-1), SD = 3.9) and National (M = 44.7 ml · kg(-1) · min.(-1), SD = 3.6) level groups. During their competitive routines, total energy and the fractions of aerobic, anaerobic alactic, and anaerobic lactic energy were 1,847...
June 2015: Perceptual and Motor Skills
L Harvey, A Wiegand, C Solomon, C Mclellan, D Lovell
AIM: The aim of the present study was to measure and compare the aerobic, anaerobic alactic and anaerobic lactic energy system contribution during the 30-sec Wingate anaerobic test (WAnT) for the upper and lower body within the same individuals. METHODS: Physically active men (N.=14) completed two WAnTs on an electronic arm ergometer and a cycle ergometer separated by three days. A fly wheel braking force corresponding to 5% and 7.5% of the participants body weight was used for the upper and lower body WAnTs respectively...
July 2015: Journal of Sports Medicine and Physical Fitness
R Bertuzzi, M A P D M Kiss, M Damasceno, R S F Oliveira, A E Lima-Silva
The purpose of this study was to analyze the relationship between the anaerobic components of the maximal accumulated oxygen deficit (MAOD) and of the 30-second Wingate anaerobic test (30-WAnT). Nine male physical education students performed: a) a maximal incremental exercise test; b) a supramaximal constant workload test to determine the anaerobic components of the MAOD; and c) a 30-WAnT to measure the peak power (PP) and mean power (MP). The fast component of the excess post-exercise oxygen consumption and blood lactate accumulation were measured after the supramaximal constant workload test in order to determine the contributions made by alactic (ALMET) and lactic (LAMET) metabolism...
March 2015: Brazilian Journal of Medical and Biological Research
Michael Phomsoupha, Guillaume Laffaye
Badminton is a racket sport for two or four people, with a temporal structure characterized by actions of short duration and high intensity. This sport has five events: men's and women's singles, men's and women's doubles, and mixed doubles, each requiring specific preparation in terms of technique, control and physical fitness. Badminton is one of the most popular sports in the world, with 200 million adherents. The decision to include badminton in the 1992 Olympics Game increased participation in the game...
April 2015: Sports Medicine
J Ribeiro, P Figueiredo, A Sousa, J Monteiro, J Pelarigo, J P Vilas-Boas, H M Toussaint, R F Fernandes
PURPOSE: Our purpose was to characterize the oxygen uptake ([Formula: see text]) kinetics, assess the energy systems contributions and determine the energy cost when swimming front crawl at extreme intensity. Complementarily, we compared swimming full body with upper body only. METHODS: Seventeen swimmers performed a 100 m maximal front crawl in two conditions: once swimming with full body and other using only the upper propulsive segments. The [Formula: see text] was continuously measured using a telemetric portable gas analyser (connected to a respiratory snorkel), and the capillary blood samples for lactate concentration analysis were collected...
May 2015: European Journal of Applied Physiology
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