scholarly journals Aerobic Fitness Evaluation during Walking Tests Identifies the Maximal Lactate Steady State

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Guilherme Morais Puga ◽  
Eduardo Kokubun ◽  
Herbert Gustavo Simões ◽  
Fabio Yuzo Nakamura ◽  
Carmen Sílvia Grubert Campbell
Keyword(s):  
Steady State ◽  
Exercise Intensity ◽  
Maximal Lactate Steady State ◽  
Constant Intensity ◽  
Walking Test ◽  
Fitness Evaluation ◽  
Lm Tests ◽  
Lactate Minimum ◽  
Polynomial Modeling ◽  
Walking Tests

Objective. The aim of this study was to verify the possibility of lactate minimum (LM) determination during a walking test and the validity of such LM protocol on predicting the maximal lactate steady-state (MLSS) intensity.Design. Eleven healthy subjects ( yr;  kg;  cm) performed LM tests on a treadmill, consisting of walking at 5.5  and with 20–22% of inclination until voluntary exhaustion to induce metabolic acidosis. After 7 minutes of recovery the participants performed an incremental test starting at 7% incline with increments of 2% at each 3 minutes until exhaustion. A polynomial modeling approach (LMp) and a visual inspection (LMv) were used to identify the LM as the exercise intensity associated to the lowest [bLac] during the test. Participants also underwent to 2–4 constant intensity tests of 30 minutes to determine the MLSS intensity.Results. There were no differences among LMv (%), LMp (%), and MLSS (%) and the Bland and Altman plots evidenced acceptable agreement between them.Conclusion. It was possible to identify the LM during walking tests with intensity imposed by treadmill inclination, and it seemed to be valid on identifying the exercise intensity associated to the MLSS.

The Lactate Minimum Test for Cycling: Estimation of the Maximal Lactate Steady State

2002 ◽  
Vol 27 (3) ◽  
pp. 232-249 ◽  
Author(s):  
Brian R. Macintosh ◽  
Shane Esau ◽  
Krista Svedahl
Keyword(s):  
Steady State ◽  
Good Predictor ◽  
Lactate Concentration ◽  
Reliability And Validity ◽  
Time Trial ◽  
Endurance Performance ◽  
Plasma Lactate ◽  
Maximal Lactate Steady State ◽  
Constant Intensity ◽  
Lactate Minimum

This study evaluated the reliability and validity of the lactate minimum test (LMT), an incremental test given after lactic acidosis wax induced by sprint exercise. This test is purported to accurately estimate the intensity of exercise at which the transport of lactate into and out of the blood is in equilibrium (maximal lactate steady state or MLSS) and should be a good predictor of endurance performance. Fourteen athletes (mean age 27.2 ± 3.7 yrs) completed the following on Kreitler rollers: (a) two 20-km time-trials (35.1 ± 3.3 and 35.7 ± 3.5 km • hr−1, p < .05); (b) two LMTs yielding lactate minimum speeds (LMS) of 33.6 ± 3.4 and 33.4 ± 3.1 km • hr−1 (p > 0.6); and (c) four constant intensity rides, at speeds bracketing the LMS. At 33.5 ± 3.1 km • hr−1 plasma lactate concentration decreased 0.4 ± 1.6 mM from 10 to 30 min. Plasma lactate increased 1.6 ± 0.7 mM white riding 0.9 ± 0.9 km • hr−1 faster. The LMT is a reliable (r2 = 0.904) and valid method to predict MLSS and a good predictor of endurance performance (LMT vs. 20-km time-trial, r2 = 0.86). Key words: anaerobic threshold, endurance, blood lactate

Maximal Lactate Steady State Prediction Through Polynomial Modeling of the Three Stage Lactate Minimum Test

2006 ◽  
Vol 38 (Supplement) ◽  
pp. S505
Author(s):  
Emerson Pardono ◽  
Rafael da Costa Sotero ◽  
Wolysson Hiyane ◽  
Marcio Rabelo Mota ◽  
Carmen Silvia Grubert Campbell ◽  
...  
Keyword(s):  
Steady State ◽  
Maximal Lactate Steady State ◽  
State Prediction ◽  
Lactate Minimum ◽  
Polynomial Modeling

Heart Rate-based Lactate Minimum Test in Running and Cycling

2021 ◽  
Author(s):  
Claudio Perret ◽  
Kathrin Hartmann
Keyword(s):  
Heart Rate ◽  
Steady State ◽  
Oxygen Uptake ◽  
Exercise Intensity ◽  
Exercise Test ◽  
Power Output ◽  
Perceived Exertion ◽  
Rating Of Perceived Exertion ◽  
Maximal Lactate Steady State ◽  
Lactate Minimum

AbstractThe heart rate-based lactate minimum test is a highly reproducible exercise test. However, the relation between lactate minimum determined by this test and maximal lactate steady state in running and cycling is still unclear. Twelve endurance-trained men performed this test in running and cycling. Exercise intensity at maximal lactate steady state was determined by performing several constant heart rate endurance tests for both exercise modes. Heart rate, power output, lactate concentration, oxygen uptake and rating of perceived exertion at lactate minimum, maximal lactate steady state and maximal performance were analysed. All parameters were significantly higher at maximal lactate steady state compared to lactate minimum for running and cycling. Significant correlations (p<0.05) between maximal lactate steady state and lactate minimum data were found. Peak heart rate and peak oxygen uptake were significantly higher for running versus cycling. Nevertheless, the exercise mode had no influence on relative (in percentage of maximal values) heart rate at lactate minimum (p=0.099) in contrast to relative power output (p=0.002). In conclusion, all measured parameters at lactate minimum were significantly lower but highly correlated with values at maximal lactate steady state in running and cycling, which allows to roughly estimate exercise intensity at maximal lactate steady state with one single exercise test.

scholarly journals Comparison of maximal lactate steady state with V2, V4, individual anaerobic threshold and lactate minimum speed in horses

2014 ◽  
Vol 66 (1) ◽  
pp. 39-46 ◽  
Author(s):  
O.A.B. Soares ◽  
G.C. Ferraz ◽  
C.B. Martins ◽  
D.P.M. Dias ◽  
J.C. Lacerda-Neto ◽  
...  
Keyword(s):  
Steady State ◽  
Anaerobic Threshold ◽  
Exercise Physiology ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Maximal Lactate Steady State ◽  
Exercise Load ◽  
Individual Anaerobic Threshold ◽  
Minimum Speed ◽  
Lactate Minimum

The anaerobic threshold is a physiologic event studied in various species. There are various methods for its assessment, recognized in the human and equine exercise physiology literature, several of these involving the relationship between blood lactate concentration (LAC) and exercise load, measured in a standardized exercise test. The aim of this study was to compare four of these methods: V2, V4, individual anaerobic threshold (IAT) and lactate minimum speed (LMS) with the method recognized as the gold standard for the assessment of anaerobic threshold, maximal lactate steady-state (MLSS). The five tests were carried out in thirteen trained Arabian horses, in which velocities and associated LAC could be measured. The mean velocities and the LAC associated with the anaerobic threshold for the five methods were respectively: V2 = 9.67±0.54; V4 = 10.98±0.47; V IAT = 9.81±0.72; V LMS = 7.50±0.57 and V MLSS = 6.14±0.45m.s-1 and LAC IAT = 2.17±0.93; LAC LMS = 1.17±0.62 and LAC MLSS = 0.84±0.21mmol.L-1. None of the velocities were statistically equivalent to V MLSS (P<0.05). V2, V4 and V LMS showed a good correlation with V MLSS , respectively: r = 0.74; r = 0.78 and r = 0.83, and V IAT did not significantly correlate with V MLSS. Concordance between the protocols was relatively poor, i.e., 3.28±1.00, 4.84±0.30 and 1.43±0.32m.s-1 in terms of bias and 95% agreement limits for V2, V4 and LMS methods when compared to MLSS. Only LAC LMS did not differ statistically from LAC MLSS. Various authors have reported the possibility of the assessment of anaerobic threshold using rapid protocols such as V4 and LMS for humans and horses. This study corroborates the use of these tests, but reveals that adjustments in the protocols are necessary to obtain a better concordance between the tests and the MLSS.

Maximal Lactate Steady-State Prediction Through Quadratic Modeling of Selected Stages of the Lactate Minimum Test

2008 ◽  
Vol 22 (4) ◽  
pp. 1073-1080 ◽  
Author(s):  
Emerson Pardono ◽  
Rafael da Costa Sotero ◽  
Wolysson Hiyane ◽  
Marcio Rabelo Mota ◽  
Carmen Silvia Grubert Campbell ◽  
...  
Keyword(s):  
Steady State ◽  
Maximal Lactate Steady State ◽  
State Prediction ◽  
Lactate Minimum

Maximal lactate steady state declines during the aging process

2003 ◽  
Vol 95 (6) ◽  
pp. 2576-2582 ◽  
Author(s):  
Craig O. Mattern ◽  
Margaret J. Gutilla ◽  
Darrin L. Bright ◽  
Timothy E. Kirby ◽  
Kenneth W. Hinchcliff ◽  
...  
Keyword(s):  
Steady State ◽  
Exercise Intensity ◽  
Citrate Synthase ◽  
Age Groups ◽  
Type I ◽  
Training Intensity ◽  
Maximal Lactate Steady State ◽  
Age Related ◽  
Competitive Cyclists ◽  
Age Related Changes

Increased participation of aged individuals in athletics warrants basic research focused on delineating age-related changes in performance variables. On the basis of potential age-related declines in aerobic enzyme activities and a shift in the expression of myosin heavy chain (MHC) isoforms, we hypothesized that maximal lactate steady-state (MLSS) exercise intensity would be altered as a function of age. Three age groups [young athletes (YA), 25.9 ± 1.0 yr, middle-age athletes (MA), 43.2 ± 1.0 yr, and older athletes (OA), 64.6 ± 2.7 yr] of male, competitive cyclists and triathletes matched for training intensity and duration were studied. Subjects performed a maximal O2 consumption (V̇o2 max) test followed by a series of 30-min exercise trials to determine MLSS. A muscle biopsy of the vastus lateralis was procured on a separate visit. There were differences ( P < 0.05) in V̇o2 max among all age groups (YA = 67.7 ± 1.2 ml · kg-1 · min-1, MA = 56.0 ± 2.6 ml · kg-1 · min-1, OA = 47.0 ± 2.6 ml · kg-1 · min-1). When expressed as a percentage of V̇o2 max, there was also an age-related decrease ( P < 0.05) in the relative MLSS exercise intensity (YA = 80.8 ± 0.9%, MA = 76.1 ± 1.4%, OA = 69.9 ± 1.5%). There were no significant age-related changes in citrate synthase activity or MHC isoform profile. The hypothesis is supported as there is an age-related decline in MLSS exercise intensity in athletes matched for training intensity and duration. Although type I MHC isoform, combined with age, is helpful in predicting ( r = 0.76, P < 0.05) relative MLSS intensity, it does not explain the age-related decline in MLSS.

Does critical swimming velocity represent exercise intensity at maximal lactate steady state?

1993 ◽  
Vol 66 (1) ◽  
pp. 90-95 ◽  
Author(s):  
Kohji Wakayoshi ◽  
Takayoshi Yoshida ◽  
Masao Udo ◽  
Takashi Harada ◽  
Toshio Moritani ◽  
...  
Keyword(s):  
Steady State ◽  
Exercise Intensity ◽  
Swimming Velocity ◽  
Maximal Lactate Steady State ◽  
Critical Swimming Velocity

Higher Accuracy of the Lactate Minimum Test Compared to Established Threshold Concepts to Determine Maximal Lactate Steady State in Running

2018 ◽  
Vol 39 (07) ◽  
pp. 541-548 ◽  
Author(s):  
Patrick Wahl ◽  
Lukas Zwingmann ◽  
Christian Manunzio ◽  
Jacob Wolf ◽  
Wilhelm Bloch
Keyword(s):  
Steady State ◽  
Exercise Test ◽  
Intraclass Correlation ◽  
Recovery Phase ◽  
Threshold Concepts ◽  
Maximal Lactate Steady State ◽  
Running Speed ◽  
Graded Exercise Test ◽  
Lactate Minimum ◽  
Graded Exercise

AbstractThis study evaluated the accuracy of the lactate minimum test, in comparison to a graded-exercise test and established threshold concepts (OBLA and mDmax) to determine running speed at maximal lactate steady state. Eighteen subjects performed a lactate minimum test, a graded-exercise test (2.4 m·s−1 start,+0.4 m·s−1 every 5 min) and 2 or more constant-speed tests of 30 min to determine running speed at maximal lactate steady state. The lactate minimum test consisted of an initial lactate priming segment, followed by a short recovery phase. Afterwards, the initial load of the subsequent incremental segment was individually determined and was increased by 0.1 m·s−1 every 120 s. Lactate minimum was determined by the lowest measured value (LMabs) and by a third-order polynomial (LMpol). The mean difference to maximal lactate steady state was+0.01±0.14 m·s−1 (LMabs), 0.04±0.15 m·s−1 (LMpol), –0.06±0.31 m·s1 (OBLA) and –0.08±0.21 m·s1 (mDmax). The intraclass correlation coefficient (ICC) between running velocity at maximal lactate steady state and LMabs was highest (ICC=0.964), followed by LMpol (ICC=0.956), mDmax (ICC=0.916) and OBLA (ICC=0.885). Due to the higher accuracy of the lactate minimum test to determine maximal lactate steady state compared to OBLA and mDmax, we suggest the lactate minimum test as a valid and meaningful concept to estimate running velocity at maximal lactate steady state in a single session for moderately up to well-trained athletes.

Does a 3-Minute All-Out Test Provide Suitable Measures of Exercise Intensity at the Maximal Lactate Steady State or Peak Oxygen Uptake for Well-Trained Runners?

2014 ◽  
Vol 9 (5) ◽  
pp. 805-810
Author(s):  
Billy Sperlich ◽  
Christoph Zinner ◽  
David Trenk ◽  
Hans-Christer Holmberg
Keyword(s):  
Steady State ◽  
Oxygen Uptake ◽  
Exercise Intensity ◽  
Peak Oxygen Uptake ◽  
Mean Difference ◽  
Maximal Lactate Steady State ◽  
Mean Velocity ◽  
Ramp Test ◽  
Trained Runners ◽  
Suitable Measure

Purpose:To examine whether a 3-min all-out test can be used to obtain accurate values for the maximal lactate steady state (vMLSS) and/or peak oxygen uptake (VO2peak) of well-trained runners.Methods:The 15 male volunteers (25 ± 5 y, 181 ± 6 cm, 76 ± 7 kg, VO2peak 69.3 ± 9.5 mL · kg−1 · min−1) performed a ramp test, a 3-min all-out test, and several submaximal 30-min runs at constant paces of vEND (mean velocity during the last 30 s of the 3-min all-out test) itself and vEND +0.2, +0.1, –0.1, –0.2, –0.3, or –0.4 m/s.Results:vMLSS and vEND were correlated (r = .69, P = .004), although vMLSS was lower (mean difference: 0.26 ± 0.32 m/s, 95% CI –.44 to –.08 m/s, P = .007, effect size = 0.65). The VO2peak values derived from the ramp and 3-min all-out tests were not correlated (r = .41, P = .12), with a mean difference of 523 ± 1002 mL (95% CI –31 to 1077 mL).Conclusion:A 3-min all-out test does not provide a suitable measure of vMLSS or VO2peak for well-trained runners.

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