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Maximal lactate state

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https://www.readbyqxmd.com/read/28128633/reliability-of-time-to-exhaustion-and-selected-psycho-physiological-variables-during-constant-load-cycling-at-the-maximal-lactate-steady-state
#1
Oliver Faude, Anne Hecksteden, Daniel Hammes, Franck Schumacher, Eric Besenius, Billy Sperlich, Tim Meyer
The maximal lactate steady-state (MLSS) is frequently assessed for prescribing endurance exercise intensity. Knowledge of the intra-individual variability of the MLSS is important for practical application. To date, little is known about the reliability of time-to-exhaustion and physiological responses to exercise at MLSS. Twenty-one healthy men (age, 25.2 (SD 3.3) years; height, 1.83 (0.06) m; body mass, 78.9 (8.9) kg; maximal oxygen uptake, 57.1 (10.7) mL·min(-1)·kg(-1)) performed 1 incremental exercise test, and 2 constant-load tests to determine MLSS intensity...
February 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28090142/the-midpoint-between-ventilatory-thresholds-approaches-maximal-lactate-steady-state-intensity-in-amateur-cyclists
#2
A B Peinado, Dm Pessôa Filho, V Díaz, P J Benito, M Álvarez-Sánchez, A G Zapico, F J Calderón
The aim was to determine whether the midpoint between ventilatory thresholds (MPVT) corresponds to maximal lactate steady state (MLSS). Twelve amateur cyclists (21.0 ± 2.6 years old; 72.2 ± 9.0 kg; 179.8 ± 7.5 cm) performed an incremental test (25 W·min(-1)) until exhaustion and several constant load tests of 30 minutes to determine MLSS, on different occasions. Using MLSS determination as the reference method, the agreement with five other parameters (MPVT; first and second ventilatory thresholds: VT1 and VT2; respiratory exchange ratio equal to 1: RER = 1...
December 2016: Biology of Sport
https://www.readbyqxmd.com/read/28044281/the-effects-of-mental-fatigue-on-physical-performance-a-systematic-review
#3
REVIEW
Jeroen Van Cutsem, Samuele Marcora, Kevin De Pauw, Stephen Bailey, Romain Meeusen, Bart Roelands
BACKGROUND: Mental fatigue is a psychobiological state caused by prolonged periods of demanding cognitive activity. It has recently been suggested that mental fatigue can affect physical performance. OBJECTIVE: Our objective was to evaluate the literature on impairment of physical performance due to mental fatigue and to create an overview of the potential factors underlying this effect. METHODS: Two electronic databases, PubMed and Web of Science (until 28 April 2016), were searched for studies designed to test whether mental fatigue influenced performance of a physical task or influenced physiological and/or perceptual responses during the physical task...
January 2, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28033123/accuracy-of-a-modified-lactate-minimum-test-and-reverse-lactate-threshold-test-to-determine-maximal-lactate-steady-state
#4
Patrick Wahl, Christian Manunzio, Florian Vogt, Sarah Strütt, Prisca Volmary, Wilhelm Bloch, Joachim Mester
This study evaluated the accuracy of a modified-lactate-minimum-test (mLMT), a modified-reverse-lactate-threshold-test (mRLT), in comparison to two established threshold concepts (OBLA & mDmax) to determine power output at maximal-lactate-steady-state (MLSS) in cycling. Nineteen subjects performed an mLMT, an mRLT, a graded-exercise-test (100W start, +20W every 3 min) and 3 or more constant-load tests of 30 minutes to determine power output at MLSS. The mLMT and mRLT both consisted of an initial lactate priming-segment, followed by a short recovery phase...
December 20, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28006434/lactate-minimum-underestimates-the-maximal-lactate-steady-state-in-swimming-mice
#5
COMPARATIVE STUDY
Natalia Almeida Rodrigues, Adriana Souza Torsoni, Thais Fante, Ivan Gustavo Masselli Dos Reis, Claudio Alexandre Gobatto, Fúlvia Barros Manchado-Gobatto
The intensity of lactate minimum (LM) has presented a good estimate of the intensity of maximal lactate steady-state (MLSS); however, this relationship has not yet been verified in the mouse model. We proposed validating the LM protocol for swimming mice by investigating the relationship among intensities of LM and MLSS as well as differences between sexes, in terms of aerobic capacity. Nineteen mice (male: 10, female: 9) were submitted to the evaluation protocols for LM and MLSS. The LM protocol consisted of hyperlactatemia induction (30 s exercise (13% body mass (bm)), 30 s resting pause and exhaustive exercise (13% bm), 9 min resting pause and incremental test)...
January 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/27918656/aerobic-evaluation-in-elite-slalom-kayakers-using-tethered-canoe-system-a-new-proposal
#6
Homero Gustavo Ferrari, Leonardo H D Messias, Ivan G M Reis, Claudio A Gobatto, Filipe A B Sousa, Camila C S Serra, Fúlvia B Manchado-Gobatto
BACKGROUND: Among other aspects, aerobic fitness is indispensable for performance in slalom canoe. PURPOSE: The aims of the study were to propose the maximal lactate steady state (MLSS) and critical force (CF) tests using a tethered canoe system as new strategies for aerobic evaluation in elite slalom kayakers. Also, we studied the relationship between the aerobic parameters from these tests and the kayakers' performances. METHODS: Twelve male elite slalom kayakers from the Brazilian National Team participated in this study...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27917127/maternal-high-fat-diet-alters-skeletal-muscle-mitochondrial-catalytic-activity-in-adult-male-rat-offspring
#7
Chantal A Pileggi, Christopher P Hedges, Stephanie A Segovia, James F Markworth, Brenan R Durainayagam, Clint Gray, Xiaoyuan D Zhang, Matthew P G Barnett, Mark H Vickers, Anthony J R Hickey, Clare M Reynolds, David Cameron-Smith
A maternal high-fat (HF) diet during pregnancy can lead to metabolic compromise, such as insulin resistance in adult offspring. Skeletal muscle mitochondrial dysfunction is one mechanism contributing to metabolic impairments in insulin resistant states. Therefore, the present study aimed to investigate whether mitochondrial dysfunction is evident in metabolically compromised offspring born to HF-fed dams. Sprague-Dawley dams were randomly assigned to receive a purified control diet (CD; 10% kcal from fat) or a high fat diet (HFD; 45% kcal from fat) for 10 days prior to mating, throughout pregnancy and during lactation...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27896024/salinity-modulates-thermotolerance-energy-metabolism-and-stress-response-in-amphipods-gammarus-lacustris
#8
Kseniya P Vereshchagina, Yulia A Lubyaga, Zhanna Shatilina, Daria Bedulina, Anton Gurkov, Denis V Axenov-Gribanov, Boris Baduev, Elizaveta S Kondrateva, Mikhail Gubanov, Egor Zadereev, Inna Sokolova, Maxim Timofeyev
Temperature and salinity are important abiotic factors for aquatic invertebrates. We investigated the influence of different salinity regimes on thermotolerance, energy metabolism and cellular stress defense mechanisms in amphipods Gammarus lacustris Sars from two populations. We exposed amphipods to different thermal scenarios and determined their survival as well as activity of major antioxidant enzymes (peroxidase, catalase, glutathione S-transferase) and parameters of energy metabolism (content of glucose, glycogen, ATP, ADP, AMP and lactate)...
2016: PeerJ
https://www.readbyqxmd.com/read/27819154/can-measures-of-critical-power-precisely-estimate-the-maximal-metabolic-steady-state
#9
COMPARATIVE STUDY
Felipe Mattioni Maturana, Daniel A Keir, Kaitlin M McLay, Juan M Murias
Critical power (CP) conceptually represents the highest power output (PO) at physiological steady-state. In cycling exercise, CP is traditionally derived from the hyperbolic relationship of ∼5 time-to-exhaustion trials (TTE) (CPHYP). Recently, a 3-min all-out test (CP3MIN) has been proposed for estimation of CP as well the maximal lactate steady-state (MLSS). The aim of this study was to compare the POs derived from CPHYP, CP3MIN, and MLSS, and the oxygen uptake and blood lactate concentrations at MLSS. Thirteen healthy young subjects (age, 26 ± 3years; mass, 69...
November 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/27792222/validation-of-the-non-exhaustive-test-to-determine-the-aerobic-capacity-in-swimming
#10
Claudio Alexandre Gobatto, Gustavo Gomes DE Araujo, Vanessa Santhiago, Marcelo Papoti, Fúlvia De Barros Manchado-Gobatto
BACKGROUND: Several methods of aerobic capacity evaluation have been applied to assess and prescribe the training sessions in swimming. However, most protocols either show exhaustive characteristics, triggering transitory stress period or several visits, influencing the session's organization. Thus, the purpose was to validate a double-bout exercise protocol for non-exhaustive aerobic capacity determination of swimmers. METHODS: Twelve swimmers were submitted to non-exhaustive and Maximal Lactate Steady State (MLSS) protocols...
October 28, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27701968/a-systematic-review-of-submaximal-cycle-tests-to-predict-monitor-and-optimize-cycling-performance
#11
REVIEW
Benoit Capostagno, Michael I Lambert, Robert P Lamberts
Finding the optimal balance between high training loads and recovery is a constant challenge for cyclists and their coaches. Monitoring improvements in performance and levels of fatigue is recommended to correctly adjust training to ensure optimal adaptation. However, many performance tests require a maximal or exhaustive effort, which reduces their real-world application. The purpose of this review was to investigate the development and use of submaximal cycling tests that can be used to predict and monitor cycling performance and training status...
September 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27695980/effects-of-caffeine-ingestion-on-endurance-performance-in-mentally-fatigued-individuals
#12
RANDOMIZED CONTROLLED TRIAL
Rafael Azevedo, Marcos David Silva-Cavalcante, Bruno Gualano, Adriano E Lima-Silva, Romulo Bertuzzi
PURPOSE: To examine the effects of caffeine ingestion on physiological and perceptual responses in mentally fatigued individuals. METHODS: Eight male physically active subjects completed four cycling constant-workload tests in four experimental conditions at 80 % of maximal power output: control (C), mental fatigue (MF), mental fatigue plus caffeine ingestion (5 mg/kg) (MF-CAF), and mental fatigue plus placebo (MF-PLA). The mental fatigue was induced by a continuous performance task A-X version (AX-CPT)...
December 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27625070/effects-of-exercise-on-alterations-in-redox-homeostasis-in-elite-male-and-female-endurance-athletes-using-a-clinical-point-of-care-test
#13
COMPARATIVE STUDY
Nathan A Lewis, Colin Towey, Georgie Bruinvels, Glyn Howatson, Charles R Pedlar
Exercise causes alterations in redox homeostasis (ARH). Measuring ARH in elite athletes may aid in the identification of training tolerance, fatigued states, and underperformance. To the best of our knowledge, no studies have examined ARH in elite male and female distance runners at sea level. The monitoring of ARH in athletes is hindered by a lack of reliable and repeatable in-the-field testing tools and by the rapid turnaround of results. We examined the effects of various exercise intensities on ARH in healthy (non-over-reached) elite male and female endurance athletes using clinical point-of-care (POC) redox tests, referred to as the free oxygen radical test (FORT) (pro-oxidant) and the free oxygen radical defence (FORD) (antioxidant)...
October 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/27613650/an-integrated-view-on-the-oxygenation-responses-to-incremental-exercise-at-the-brain-the-locomotor-and-respiratory-muscles
#14
REVIEW
Jan Boone, Kristof Vandekerckhove, Ilse Coomans, Fabrice Prieur, Jan G Bourgois
In the past two decades oxygenation responses to incremental ramp exercise, measured non-invasively by means of near-infrared spectroscopy at different locations in the body, have advanced the insights on the underpinning mechanisms of the whole-body pulmonary oxygen uptake ([Formula: see text]) response. In healthy subjects the complex oxygenation responses at the level of locomotor and respiratory muscles, and brain were simplified and quantified by the detection of breakpoints as a deviation in the ongoing response pattern as work rate increases...
December 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27608631/erratum-to-comparison-of-calculated-and-experimental-power-in-maximal-lactate-steady-state-during-cycling
#15
Thomas Hauser, Jennifer Adam, Henry Schulz
No abstract text is available yet for this article.
2016: Theoretical Biology & Medical Modelling
https://www.readbyqxmd.com/read/27536996/ventricular-fibrillation-waveform-changes-during-controlled-coronary-perfusion-using-extracorporeal-circulation-in-a-swine-model
#16
Raúl J Gazmuri, Christopher L Kaufman, Alvin Baetiong, Jeejabai Radhakrishnan
BACKGROUND: Several characteristics of the ventricular fibrillation (VF) waveform have been found predictive of successful defibrillation and hypothesized to reflect the myocardial energy state. In an open-chest swine model of VF, we modeled "average CPR" using extracorporeal circulation (ECC) and assessed the time course of coronary blood flow, myocardial metabolism, and myocardial structure in relation to the amplitude spectral area (AMSA) of the VF waveform without artifacts related to chest compression...
2016: PloS One
https://www.readbyqxmd.com/read/27518586/do-5-changes-around-maximal-lactate-steady-state-lead-to-swimming-biophysical-modifications
#17
Jailton Gregório Pelarigo, Camila Coelho Greco, Benedito Sérgio Denadai, Ricardo Jorge Fernandes, João Paulo Vilas-Boas, David Robert Pendergast
Our purpose was to examine the swimming biophysical responses at velocities (v) of 97.5, 100 and 102.5% of the maximal lactate steady state (MLSS). Ten elite female swimmers performed three-to-five 30-min constant tests at imposed paces to determine 97.5, 100 and 102.5%MLSS v. Gas exchange, blood lactate concentration ([La-]), stroke rate (SR) and v were determined during each test. The v values at 97.5, 100 and 102.5%MLSS were 1.21±0.07, 1.24±0.07 and 1.27±0.07m.s(-1), respectively. Oxygen uptake (V̇O2) and Pulmonary ventilation (V̇E) increased as function of v...
October 2016: Human Movement Science
https://www.readbyqxmd.com/read/27468188/predictive-factors-of-short-term-outcome-after-liver-transplantation-a-review
#18
REVIEW
Giuliano Bolondi, Federico Mocchegiani, Roberto Montalti, Daniele Nicolini, Marco Vivarelli, Lesley De Pietri
Liver transplantation represents a fundamental therapeutic solution to end-stage liver disease. The need for liver allografts has extended the set of criteria for organ acceptability, increasing the risk of adverse outcomes. Little is known about the early postoperative parameters that can be used as valid predictive indices for early graft function, retransplantation or surgical reintervention, secondary complications, long intensive care unit stay or death. In this review, we present state-of-the-art knowledge regarding the early post-transplantation tests and scores that can be applied during the first postoperative week to predict liver allograft function and patient outcome, thereby guiding the therapeutic and surgical decisions of the medical staff...
July 14, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/27435406/the-impact-of-hematocrit-on-oxygenation-sensitive-cardiovascular-magnetic-resonance
#19
Dominik P Guensch, Gobinath Nadeshalingam, Kady Fischer, Aurelien F Stalder, Matthias G Friedrich
BACKGROUND: Oxygenation-sensitive (OS) Cardiovascular Magnetic Resonance (CMR) is a promising utility in the diagnosis of heart disease. Contrast in OS-CMR images is generated through deoxyhemoglobin in the tissue, which is negatively correlated with the signal intensity (SI). Thus, changing hematocrit levels may be a confounder in the interpretation of OS-CMR results. We hypothesized that hemodilution confounds the observed signal intensity in OS-CMR images. METHODS: Venous and arterial blood from five pigs was diluted with lactated Ringer solution in 10 % increments to 50 %...
2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27420312/estimation-of-the-maximal-lactate-steady-state-intensity-by-the-rating-of-perceived-exertion
#20
Bibiano Madrid, Flávio Oliveira Pires, Jonato Prestes, Denis César Leite Vieira, Tyler Clark, Eduard Tiozzo, John E Lewis, Carmen S Grubert Campbell, Herbert Gustavo Simões
The maximal lactate steady state is the gold standard for evaluating aerobic capacity; however, it is time-consuming. The lactate minimum protocol is an easier alternative, but is not feasible and still expensive. This study investigated whether the rating of perceived exertion of 13 is an accurate predictor of lactate minimum and maximal lactate steady state intensities. Eleven physically active men performed three tests: (1) incremental exercise with workloads based on rating of perceived exertion of 10, 13, and 16 (experimental protocol - denominated RPE-13 test), (2) lactate minimum, and (3) maximal lactate steady state...
February 2016: Perceptual and Motor Skills
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