Comparison of calculated and experimental power in maximal lactate-steady state during cycling.

Henry Schulz,Thomas Hauser,Jennifer Adam

doi:10.1186/1742-4682-11-25

Abstract

BackgroundThe purpose of this study was the comparison of the calculated (MLSSC) and experimental power (MLSSE) in maximal lactate steady-state (MLSS) during cycling.Methods13 male subjects (24.2 ± 4.76 years, 72.9 ± 6.9 kg, 178.5 ± 5.9 cm, : 60.4 ± 8.6 ml min−1 kg−1, : 0.9 ± 0.19 mmol l-1 s-1) performed a ramp-test for determining the and a 15 s sprint-test for measuring the maximal glycolytic rate (). All tests were performed on a Lode-Cycle-Ergometer. and were used to calculate MLSSC. For the determination of MLSSE several 30 min constant load tests were performed. MLSSE was defined as the highest workload that can be maintained without an increase of blood-lactate-concentration (BLC) of more than 0.05 mmol l−1 min−1 during the last 20 min. Power in following constant-load test was set higher or lower depending on BLC.ResultsMLSSE and MLSSC were measured respectively at 217 ± 51 W and 229 ± 47 W, while mean difference was −12 ± 20 W. Orthogonal regression was calculated with r = 0.92 (p < 0.001).ConclusionsThe difference of 12 W can be explained by the biological variability of and . The knowledge of both parameters, as well as their individual influence on MLSS, could be important for establishing training recommendations, which could lead to either an improvement in or by performing high intensity or low intensity exercise training, respectively. Furthermore the validity of -test should be focused in further studies.

Highlights

Over the last 35 years, incremental graded exercise tests have been established for detecting endurance performance on the basis of a lactate-performance curve and the application of several different lactate-threshold concepts [1]
Most of these lactate concepts have the aim to approximate the power output achieved at maximal lactatesteady-state (PMLSS), which is one criterion of endurance performance [1,2]
Study sample 13 male subjects with different endurance levels participated in this study

Summary

Introduction

Over the last 35 years, incremental graded exercise tests have been established for detecting endurance performance on the basis of a lactate-performance curve and the application of several different lactate-threshold concepts [1] Most of these lactate concepts have the aim to approximate the power output achieved at maximal lactatesteady-state (PMLSS), which is one criterion of endurance performance [1,2]. Hauser et al [5] compared the power at "onset of blood lactate accumulation" (OBLA) [6,7], the "individual anaerobic threshold" (IAT) [8] and the " + 1.5 mmol·l−1 lactate model" [9] with power in MLSS, measured during 30-minutes constant load tests. Power in following constant-load test was set higher or lower depending on BLC

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Discussion

Conclusion