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Maximal lactate steady 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/28033123/accuracy-of-a-modified-lactate-minimum-test-and-reverse-lactate-threshold-test-to-determine-maximal-lactate-steady-state
#3
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
#4
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
#5
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/27896024/salinity-modulates-thermotolerance-energy-metabolism-and-stress-response-in-amphipods-gammarus-lacustris
#6
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
#7
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
#8
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/27613650/an-integrated-view-on-the-oxygenation-responses-to-incremental-exercise-at-the-brain-the-locomotor-and-respiratory-muscles
#9
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
#10
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/27518586/do-5-changes-around-maximal-lactate-steady-state-lead-to-swimming-biophysical-modifications
#11
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/27420312/estimation-of-the-maximal-lactate-steady-state-intensity-by-the-rating-of-perceived-exertion
#12
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
https://www.readbyqxmd.com/read/27324190/modeling-the-relationship-between-exposure-to-abiraterone-and-prostate-specific-antigen-dynamics-in-patients-with-metastatic-castration-resistant-prostate-cancer
#13
Xu Steven Xu, Charles J Ryan, Kim Stuyckens, Matthew R Smith, Fred Saad, Thomas W Griffin, Youn C Park, Margaret K Yu, Peter De Porre, An Vermeulen, Italo Poggesi, Partha Nandy
BACKGROUND AND OBJECTIVES: Recent analysis revealed strong associations between prostate-specific antigen (PSA) dynamics and overall survival (OS) in metastatic castration-resistant prostate cancer (mCRPC) and supported PSA dynamics as bridging surrogacy endpoints for clinical benefit from treatment with abiraterone acetate plus prednisone. This analysis aimed to investigate the abiraterone exposure-PSA dynamics relationship in mCRPC. METHODS: Abiraterone pharmacokinetics-PSA models were constructed using data from the COU-AA-301 (chemotherapy-pretreated) and COU-AA-302 (chemotherapy-naïve) trials comparing abiraterone acetate 1000 mg/day plus prednisone 5 mg twice daily with prednisone alone in mCRPC...
June 21, 2016: Clinical Pharmacokinetics
https://www.readbyqxmd.com/read/27249820/maximal-lactate-steady-state-depends-on-cycling-cadence
#14
Ralph Beneke, Renate M Leithäuser
The maximal lactate steady state (MLSS) depicts the highest blood lactate concentration (BLC) that can be maintained over time without a continual accumulation at constant prolonged workload. In cycling, no difference in the MLSS was combined with lower power output related to peak workload (IMLSS) at 100 than at 50 revolutions per minute (RPM). MLSS coincides with a respiratory exchange ratio (RER) close to 1. Recently, at incremental exercise, an RER of 1 was found at similar workload and similar intensity but higher BLC at 100 compared with 50RPM...
June 1, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27232241/cardiovascular-and-renal-effects-of-birdseed-associated-with-aerobic-exercise-in-rats
#15
Clévia Santos Passos, Rosemara Silva Ribeiro, Thiago Santos Rosa, Rodrigo Vanerson Passos Neves, Fernando Costa, Milton Ginoza, Mirian Aparecida Boim
INTRODUCTION: Phalaris canariensis L. (Pc), known as birdseed, is rich in tryptophan. The aqueous extract of Pc (AEPc) treatment reduced systolic blood pressure (SBP) in spontaneously hypertensive rats (SHR) via mechanisms mediated by the tryptophan metabolizing enzyme indoleamine 2,3-dioxygenase (IDO). Hypertension is a risk factor to cardiovascular and renal diseases. Considering that physical exercise improves hypertension and cardiovascular function, the aim of this study was to evaluate whether the benefits of exercise (Ex) would be enhanced by concomitant AEPc treatment (400 mg·kg·d p...
October 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27225657/fluid-transport-by-the-cornea-endothelium-is-dependent-on-buffering-lactic-acid-efflux
#16
Shimin Li, Edward Kim, Joseph A Bonanno
Maintenance of corneal hydration is dependent on the active transport properties of the corneal endothelium. We tested the hypothesis that lactic acid efflux, facilitated by buffering, is a component of the endothelial fluid pump. Rabbit corneas were perfused with bicarbonate-rich (BR) or bicarbonate-free (BF) Ringer of varying buffering power, while corneal thickness was measured. Perfusate was collected and analyzed for lactate efflux. In BF with no added HEPES, the maximal corneal swelling rate was 30.0 ± 4...
July 1, 2016: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/27148063/severe-obesity-shifts-metabolic-thresholds-but-does-not-attenuate-aerobic-training-adaptations-in-zucker-rats
#17
Thiago S Rosa, Herbert G Simões, Marcelo M Rogero, Milton R Moraes, Benedito S Denadai, Ricardo M Arida, Marília S Andrade, Bruno M Silva
Severe obesity affects metabolism with potential to influence the lactate and glycemic response to different exercise intensities in untrained and trained rats. Here we evaluated metabolic thresholds and maximal aerobic capacity in rats with severe obesity and lean counterparts at pre- and post-training. Zucker rats (obese: n = 10, lean: n = 10) were submitted to constant treadmill bouts, to determine the maximal lactate steady state, and an incremental treadmill test, to determine the lactate threshold, glycemic threshold and maximal velocity at pre and post 8 weeks of treadmill training...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27116348/estimation-of-the-maximal-lactate-steady-state-in-endurance-runners
#18
I Llodio, E M Gorostiaga, I Garcia-Tabar, C Granados, L Sánchez-Medina
This study aimed to predict the velocity corresponding to the maximal lactate steady state (MLSSV) from non-invasive variables obtained during a maximal multistage running field test (modified University of Montreal Track Test, UMTT), and to determine whether a single constant velocity test (CVT), performed several days after the UMTT, could estimate the MLSSV. Within 4-5 weeks, 20 male runners performed: 1) a modified UMTT, and 2) several 30 min CVTs to determine MLSSV to a precision of 0.25 km·h(-1)...
June 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/26999454/temporal-robustness-of-the-session-rating-of-perceived-exertion
#19
Joshua Christen, Carl Foster, John P Porcari, Richard P Mikat
PURPOSE: The session rating of perceived exertion (sRPE) has gained popularity as a "user friendly" method for evaluating internal training load. sRPE has historically been obtained 30 min after exercise. This study evaluated the effect of postexercise measurement time on sRPE after steady-state and interval cycle exercise. METHODS: Well-trained subjects (N = 15) (maximal oxygen consumption = 51 ± 4 and 36 ± 4 mL/kg [cycle ergometer] for men and women, respectively) completed counterbalanced 30-minute steady-state and interval training bouts...
November 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/26578151/lack-of-concordance-amongst-measurements-of-individual-anaerobic-threshold-and-maximal-lactate-steady-state-on-a-cycle-ergometer
#20
Iñaki Arratibel-Imaz, Julio Calleja-González, Jose Ignacio Emparanza, Nicolas Terrados, Jeffrey M Mjaanes, Sergej M Ostojic
INTRODUCTION: The calculation of exertion intensity, in which a change is produced in the metabolic processes which provide the energy to maintain physical work, has been defined as the anaerobic threshold (AT). The direct calculation of maximal lactate steady state (MLSS) would require exertion intensities over a long period of time and with sufficient rest periods which would prove significantly difficult for daily practice. Many protocols have been used for the indirect calculation of MLSS...
2016: Physician and Sportsmedicine
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