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J Sports Med Phys Fitness. 2013 Dec;53(6):588-95.

Maximal constant 45 min running velocity gives maximal lactate steady state.

Author information

  • 1University of Bielefeld, Institute of Sports Medicine, Bielefeld, Germany - christian.vobejda@uni-bielefeld.de.

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.

PMID:
24247182
[PubMed - indexed for MEDLINE]
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