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Alactic metabolism

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 V̇O2 , 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 four consecutive 25-m laps (L0-25 , L25-50 , L50-75 , L75-100 ) of a 100-m maximal freestyle swim. METHODS: Elite swimmers comprising 26 juniors (16 ± 1 y) and 23 seniors (24 ± 5 y) performed 100 m at maximal speed, and then three trials (25, 50 and 75 m) at the same pace as that of the 100 m...
February 21, 2018: International Journal of Sports Physiology and Performance
Rodrigo Silveira, Victor Amorim Andrade-Souza, Lucyana Arcoverde, Fabiano Tomazini, André Sansonio, David John Bishop, Romulo Bertuzzi, Adriano Eduardo Lima-Silva
PURPOSE: The assumption that the curvature constant (W´) of the power-duration relationship represents anaerobic work capacity is a controversial, unresolved question. We investigated if caffeine ingestion could increase total work done above critical power (CP), and if this would be accompanied by greater anaerobic energy expenditure and by an enhanced maintenance of maximal oxidative metabolic rate. METHODS: Nine men (26.6 ± 5.3 years, V˙O2max 40.6 ± 5.8 mL·kg·min) cycled until exhaustion at different exercise intensities on different days to determine the CP and W´...
August 21, 2017: Medicine and Science in Sports and Exercise
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, Physiologie Appliquée, Nutrition et Métabolisme
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
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, Revista Brasileira de Pesquisas Médicas e Biológicas
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
Ana Sousa, Pedro Figueiredo, Paola Zamparo, David B Pyne, João P Vilas-Boas, Ricardo J Fernandes
PURPOSE: A bioenergetical analysis of different exercise modes near maximal oxygen consumption (V˙O2max) intensity is scarce, hampering the prescription of training to enhance performance. We assessed the time sustained in swimming, rowing, running, and cycling at an intensity eliciting V˙O2max and determined the specific oxygen uptake (V˙O2) kinetics and total energy expenditure (Etot-tlim). METHODS: Four subgroups of 10 swimmers, 10 rowers, 10 runners, and 10 cyclists performed (i) an incremental protocol to assess the velocity (vV˙O2max) or power (wV˙O2max) associated with V˙O2max and (ii) a square wave transition exercise from rest to vV˙O2max/wV˙O2max to assess the time to voluntary exhaustion (Tlim-100%V˙O2max)...
August 2015: Medicine and Science in Sports and Exercise
M I Ferreira, T M Barbosa, H P Neiva, J Vilaça-Alves, M J Costa, D A Marinho
AIM: The aim of this study was to track and compare the changes of performance and energetic profile of male and female masters swimmers during a season. METHODS: Eleven female (age: 34.7±7.3-y) and fourteen male (age: 35.6±7.4-y) with 4.2±3.7-y and 3.9±1.6-y of experience in masters, respectively, performed an all-out 200 m freestyle to evaluate total energy expenditure (Etot), aerobic (Aer), anaerobic lactic (AnL) and alactic (AnAl) contributions. The oxygen uptake (VO2) was measured immediately after the 200 m trial and the VO2 reached during the trial was estimated through the backward extrapolation of the O2 recovery curve...
December 2015: Journal of Sports Medicine and Physical Fitness
Arkadiusz Stanula, Robert Roczniok, Tomasz Gabryś, Urszula Szmatlan-Gabryś, Adam Maszczyk, Przemysław Pietraszewski
This study characterizes the athletes participating in the 2010 Winter Olympic Games in terms of body height, body mass and BMI. The studied sample consisted of athletes in the top 20 places of each of 14 sports disciplines (1460 cases). Data on the athletes' age, height, body mass, and sports specialization were obtained from the Olympic Games' official website and from the International Ski Federation. The sampled athletes were grouped according to the predominant type of energy metabolism during competition...
December 2013: Perceptual and Motor Skills
Philip Davis, Renate M Leithäuser, Ralph Beneke
UNLABELLED: The energy expenditure of amateur boxing is unknown. PURPOSE: Total metabolic cost (Wtot) as an aggregate of aerobic (Waer), anaerobic lactic (W[lactate]), and anaerobic alactic (WPCr) energy of a 3 × 2-min semicontact amateur boxing bout was analyzed. METHODS: Ten boxers (mean ± SD [lower/upper 95% confidence intervals]) age 23.7 ± 4.1 (20.8/26.6) y, height 180.2 ± 7.0 (175.2/185.2) cm, body mass 70.6 ± 5.7 (66.5/74.7) kg performed a semicontact bout against handheld pads created from previously analyzed video footage of competitive bouts...
March 2014: International Journal of Sports Physiology and Performance
Armin Kibele, David Behm
A new testing procedure is introduced to evaluate the alactic running performance in a 10s sprint task with near-maximal movement velocity. The test is performed on a motor-equipped treadmill with inverted polarity that increases mechanical resistance instead of driving the treadmill belt. As a result, a horizontal force has to be exerted against the treadmill surface in order to overcome the resistant force of the engine and to move the surface in a backward direction. For this task, subjects lean with their hands towards the front safety barrier of the treadmill railing with a slightly inclined body posture...
December 2005: Journal of Sports Science & Medicine
Luciana Setaro, Paulo Roberto Santos-Silva, Eduardo Yoshio Nakano, Cristiane Hermes Sales, Newton Nunes, Júlia Maria Greve, Célia Colli
The aim of this study was to test the hypothesis that magnesium supplementation influences the physical performance of volleyball players, as the efficacy of this approach remains questionable. Twenty-five professional male volleyball players were assigned randomly to experimental (350 mg Mg · d(-1), 4 weeks) and control groups (500 mg maltodextrin · d(-1), 4 weeks) maintaining inter-group homogeneity of urinary magnesium. Erythrocyte, plasma and urinary magnesium levels, plasma creatine kinase activity, lactate production, maximal oxygen uptake (VO2 max) and plyometric (squat jump, countermovement jump, countermovement jump with arm swing) and isokinetic (peak torque, potency and total work) performances were evaluated before (T0) and after (T1) supplementation...
2014: Journal of Sports Sciences
Ana Sousa, Pedro Figueiredo, Paola Zamparo, João Paulo Vilas-Boas, Ricardo J Fernandes
To estimate the anaerobic alactic contribution in a 200 m middle distance swimming trial by means of two different methods based: (1) on the fast component of the VO2 off-kinetics (Ana recovery) and (2) on the kinetics of maximal phosphocreatine splitting in the contracting muscle (Ana pcr). Ten elite male swimmers performed a 200 m front crawl trial at maximal velocity during which VO2 was directly measured using a telemetric portable gas analyser; during the recovery period VO2 data were collected until baseline values were reached...
August 2013: European Journal of Applied Physiology
Dale Lovell, Ava Kerr, Aaron Wiegand, Colin Solomon, Leonie Harvey, Chris McLellan
The purpose of this study was to measure the contribution of the aerobic, anaerobic lactic, and alactic systems during an upper body Wingate Anaerobic test (WAnT). Oxygen uptake and blood lactate were measured before, during, and after the WAnT and body composition analyzed by dual-energy X-ray absorptiometry. The contribution of the energy systems was 11.4% ± 1.4%, 60.3% ± 5.6%, and 28.3% ± 4.9% for the aerobic, anaerobic lactic, and alactic systems, respectively.
February 2013: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
I A Krivolapchuk
Research objective was studying of features of a physical state (PS) adolescents of 13-14 years with high (n = 97) and low (n = 85) level of stress reactivity. The obtained data testify that in puberty formation of mechanisms of energy supply for muscle activity at adolescents with various level of stress reactivity occurs heterochronic and nonlinearly. Thus hyperreactivity boys of 13-14 years are characterised concerning high anaerobic alactic and the low aerobic productivity of the organism raised by physiological working costs and slowed down restoration after loadings of the big and submaximum capacity...
November 2012: Fiziologiia Cheloveka
John F Moxnes, Kjell Hausken, Øyvind Sandbakk
BACKGROUND: This study investigated two different mathematical models for the kinetics of anaerobic power. Model 1 assumes that the work power is linear with the work rate, while Model 2 assumes a linear relationship between the alactic anaerobic power and the rate of change of the aerobic power. In order to test these models, a cross country skier ran with poles on a treadmill at different exercise intensities. The aerobic power, based on the measured oxygen uptake, was used as input to the models, whereas the simulated blood lactate concentration was compared with experimental results...
2012: Theoretical Biology & Medical Modelling
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