Maximal steady state blood lactate levels in 11-year-old boys

Mocellin, R; Heusgen, M; Korsten-Reck, U.

doi:10.1007/bf01957277

Cited by 20 publications

(10 citation statements)

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“…This kind of determination provides a better basis for the comparison between values of anaerobic threshold and maximal steady-state blood lactate than could be provided by a conventional incremental exercise test. The anaerobic threshold was considered to have been reached or slightly exceeded at a mean blood lactate of 2.7mmol/1, a value distinctly lower than that of 4.0 mmol/1 regarded to represent the onset of anaerobic metabolism in adults [18]. However, in our group of boys the lactate anaerobic threshold occured at 82% of VO2max, which is in good agreement with the data of the studies relying on lactate criteria to determine the anaerobic threshold.…”

Section: Discussionsupporting

confidence: 88%

“…This assumption implies that the duration of work at a constant load in this range is limited due to accumulation of blood lactate. Recent studies [18,19], however, have shown that in 10-to 12-year-old boys, a steady-state of blood lactate is maintained at exericse levels distinctly above the anaerobic threshold. Thus, the dysequilibrium between lactate production and its elimination seen beyond the anaerobic threshold but below the maximal steady-state blood lactate is only transient.…”

Section: Introductionmentioning

confidence: 95%

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Oxygen deficit and blood lactate in prepubertal boys during exercise above the anaerobic threshold

et al. 1993

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Recent studies have shown that in boys a steady-state of blood lactate is maintained at exercise levels above the anaerobic threshold. Therefore, the explanation hitherto provided for the steeper increase in blood lactate beyond the anaerobic threshold, i.e. the onset of anaerobic metabolism, needs modification. Investigations were carried out in ten boys, aged 11-12 years, during treadmill running. Maximal oxygen uptake (VO2max) and maximal blood lactate were determined during incremental exercise. Subsequently each boy performed four runs at different high constant speeds of 16 min duration, in order to determine maximal steady-state blood lactate. The underlying data also served to estimate roughly the lactate anaerobic threshold. Oxygen uptaken (VO2) was measured at 0.5 min intervals during the initial 7.5 min of each constant-speed run. Maximal steady-state blood lactate was 5.6 mmol/l corresponding to 92% of VO2max. The mean blood lactate at which the anaerobic threshold was reached or just exceeded was 2.7 mmol/l corresponding to 82% of VO2max. Oxygen transport transient kinetics were computed from the mean 0.5 min VO2-values during the constant-speed runs near the maximal steady-state blood lactate and from runs near the anaerobic threshold. Half-times of VO2 response were shorter than values previously reported for adults due to a faster increase in VO2 at the onset of exercise. Half-times increased with increasing work rates as did the oxygen deficit, due to a slower increase in VO2 along with a longer time required to attain a steady-state at higher work rates.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 95%

Oxygen deficit and blood lactate in prepubertal boys during exercise above the anaerobic threshold

et al. 1993

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“…Since then, numerous studies have been published about MLSS, utilizing different types of equipment, modalities, movement patterns, use of engaging muscle groups and endurance performance. From this point of view, differences in blood lactate concentrations at MLSS intensities (MLSS[La]) presented in literature (Almarwaey et al 2004; Aunola and Rusko 1992;Bacon and Kern 1999;Baron et al 2003;Beneke 1995Beneke , 2003bBeneke et al , 2000Beneke et al , 2001Billat et al 2004;Beneke and von Duvillard 1996;Dekerle et al 2003;Denadai et al 2004;Harnish et al 2001;Haverty et al 1988;Heck et al 1985;Hofmann et al 1994;Jones and Doust 1998;Jones and Carter 2000;MacIntosh et al 2002;Mocellin et al 1990;Pringle and Jones 2002;Smith and Jones 2001;Usaj and Starc 1996;Yamamoto et al1991) had to be expected. Considering the broad range of findings associated with MLSS [La] in comparable test conditions, we examined two questions associated with high inter-individual variability in MLSS[La]: (1) the influence of broad range of endurance performance values of our subjects and (2) the influence of sex differences on endurance performance that may influence MLSS [La] determination.…”

Section: Introductionmentioning

confidence: 99%

Blood lactate concentration at the maximal lactate steady state is not dependent on endurance capacity in healthy recreationally trained individuals

et al. 2011

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The aim of the study was to investigate the independent relationship between maximal lactate steady state (MLSS), blood lactate concentration [La] and exercise performance as reported frequently. Sixty-two subjects with a wide range of endurance performance (MLSS power output 199 ± 55 W; range: 100-302 W) were tested on an electronically braked cycle ergometer. One-min incremental exercise tests were conducted to determine maximal variables as well as the respiratory compensation point (RCP) and the second lactate turn point (LTP2). Several continuous exercise tests were performed to determine the MLSS. Subjects were divided into three clusters of exercise performance. Dietary control was employed throughout all testing. No significant correlation was found between MLSS [La] and power output at MLSS. Additionally, the three clusters of subjects with different endurance performance levels based on power output at MLSS showed no significant difference for MLSS [La]. MLSS [La] was not significantly different between men and women (average of 4.80 ± 1.50 vs. 5.22 ± 1.52 mmol l(-1)). MLSS [La] was significantly related to [La] at RCP, LTP2 and at maximal power. The results of this study support previous findings that MLSS [La] is independent of endurance performance. Additionally, MLSS [La] was not influenced by sex. Correlations found between MLSS [La] and [La] at maximal power and at designated anaerobic thresholds indicate only an association of [La] response during incremental and MLSS exercise when utilizing cycle ergometry.

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“…Nevertheless, various concepts of the anaerobic threshold do not necessarily provide identical levels of lactate and/or workloads at MLSS and/or MLSS workload (Beneke 1995). Consequently, the determination of MLSS requires several subsequent constant submaximal load tests performed on separate days (Aunola and Rusko 1992;Beneke 1995;Haverty et al 1988;Heck 1990;Mocellin et al 1990;Urhausen et al 1993).…”

Section: Introductionmentioning

confidence: 99%

Methodological aspects of maximal lactate steady state—implications for performance testing

2003

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The maximal lactate steady state (MLSS) is the highest blood lactate concentration (BLC) that can be identified as maintaining a steady-state during a prolonged submaximal constant workload. Comparative interpretation of published data about MLSS is complicated by the fact that different methods of testing have been utilized. Thus, three methods, corresponding to the time course of changes in BLC incurred during either 30 min (MLSS I) or 20 min (MLSS II and III) of constant submaximal workload exercise, were compared in 26 male subjects [mean (SD) age 24.6 (5.6) years, height 181.6 (4.9) cm, body mass 74.4 (5.2) kg]. MLSS I [5.1 (1.3) mmol x l(-1)], II [4.9 (1.3) mmol x l(-1)], and III [4.3 (1.3) mmol x l(-1)] were different (P<0.01). The workload corresponding to MLSS III [244.8 (44.0) W] was lower (P<0.01) than that at MLSS I [254.0 (40.8) W] and II [251.9 (40.4) W]. No difference could be confirmed between the workloads established for MLSS I and MLSS II. The differences between MLSS I, MLSS II, and MLSS III and corresponding workloads reflect insufficient contribution to lactate kinetics by testing procedures that depend strongly upon the time course of changes in BLC during the initial 20-25 min of constant-workload exercise. Based on the present findings, constant-load tests lasting at least 30 min and a BLC increase of no more than 1.0 mmol x l(-1) after the 10th testing minute appear to be the most reasonable with respect to valid testing results.

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Maximal steady state blood lactate levels in 11-year-old boys

Cited by 20 publications

References 8 publications

Oxygen deficit and blood lactate in prepubertal boys during exercise above the anaerobic threshold

Oxygen deficit and blood lactate in prepubertal boys during exercise above the anaerobic threshold

Blood lactate concentration at the maximal lactate steady state is not dependent on endurance capacity in healthy recreationally trained individuals

Methodological aspects of maximal lactate steady state—implications for performance testing

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