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  • Title: Maximal constant 45 min running velocity gives maximal lactate steady state.
    Author: Vobejda C, Wortmann T, Zimmermann E.
    Journal: J Sports Med Phys Fitness; 2013 Dec; 53(6):588-95. PubMed ID: 24247182.
    Abstract:
    AIM: The aim of the present study was to improve and confirm a time trial (TT) based method for determining anaerobic threshold (AnT) requiring minimal equipment. METHODS: Eighteen participants underwent three to five all-out TTs for at the most 60 min. Velocity of the TTs was adapted in 0.1 or 0.2 m*s-1 steps until maximal velocity maintainable for at least 45 min (V(max45)) was identified. Exercise was interrupted every 5 min in order to take blood samples. After the participants had finished their last TT blood lactate concentration (BLC) was determined to identify maximal lactate steady state (MLSS). RESULTS: Velocity, BLC and heart rate (HR) at the TTs giving MLSS (TTMLSS) and giving V(max45) (TTV(max45)) were almost identical (3.45 ± 0.31 m*s-1 vs. 3.44 ± 0.31 m*s-1, 4.46 ± 1.28 mmol*L-1 vs. 4.52 ± 1.28 mmol*L-1, 177 ± 9.8 bpm vs. 178 ± 9.4 bpm). Coefficient of correlation (R) and standard error of estimate (SEE) between velocity at MLSS (VMLSS) and V(max45) were 0.96 and 0.09 m*s-1, respectively, indicating a very close relationship. Agreement between VMLSS and V(max45) was also very high. At VMLSS cardiovascular drift (CVD) was 8.4 ± 2.6 bpm from the 10th to 30th min. At V(max45) CVD was 7.9±2.8 bpm from the 10th to 30th min and 11.2 ± 3.8 bpm from the 10th to 45th min. CONCLUSION: Determination of V(max45) is a manageable, cost-saving and precise method for predicting velocity and CVD at MLSS in healthy, ambitious and at least moderately trained runners.
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