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Manipulating graded exercise test variables affects the validity of the lactate threshold and V˙O2peak

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  • Nicholas A Jamnick
  • Javier Botella
  • David B Pyne
  • David J Bishop

Abstract

Background: To determine the validity of the lactate threshold (LT) and maximal oxygen uptake (V˙O2max) determined during graded exercise test (GXT) of different durations and using different LT calculations. Trained male cyclists (n = 17) completed five GXTs of varying stage length (1, 3, 4, 7 and 10 min) to establish the LT, and a series of 30-min constant power bouts to establish the maximal lactate steady state (MLSS). V˙O2 was assessed during each GXT and a subsequent verification exhaustive bout (VEB), and 14 different LTs were calculated from four of the GXTs (3, 4, 7 and 10 min)—yielding a total 56 LTs. Agreement was assessed between the highest V˙O2 measured during each GXT (V˙O2peak) as well as between each LT and MLSS. V˙O2peak and LT data were analysed using mean difference (MD) and intraclass correlation (ICC). Results: The V˙O2peak value from GXT1 was 61.0 ± 5.3 mL.kg-1.min-1 and the peak power 420 ± 55 W (mean ± SD). The power at the MLSS was 264 ± 39 W. V˙O2peak from GXT3, 4, 7, 10 underestimated V˙O2peak by ~1–5 mL.kg-1.min-1. Many of the traditional LT methods were not valid and a newly developed Modified Dmax method derived from GXT4 provided the most valid estimate of the MLSS (MD = 1.1 W; ICC = 0.96). Conclusion: The data highlight how GXT protocol design and data analysis influence the determination of both V˙O2peak and LT. It is also apparent that V˙O2max and LT cannot be determined in a single GXT, even with the inclusion of a VEB.

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  • Nicholas A Jamnick & Javier Botella & David B Pyne & David J Bishop, 2018. "Manipulating graded exercise test variables affects the validity of the lactate threshold and V˙O2peak," PLOS ONE, Public Library of Science, vol. 13(7), pages 1-21, July.
    • Handle: RePEc:plo:pone00:0199794
    DOI: 10.1371/journal.pone.0199794
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    References listed on IDEAS

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    1. Aldrich, J., 1995. "Correlations genuine and spurious in Pearson and Yule," Discussion Paper Series In Economics And Econometrics 9502, Economics Division, School of Social Sciences, University of Southampton.
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    1. Cesare Granata & Nikeisha J. Caruana & Javier Botella & Nicholas A. Jamnick & Kevin Huynh & Jujiao Kuang & Hans A. Janssen & Boris Reljic & Natalie A. Mellett & Adrienne Laskowski & Tegan L. Stait & A, 2021. "High-intensity training induces non-stoichiometric changes in the mitochondrial proteome of human skeletal muscle without reorganisation of respiratory chain content," Nature Communications, Nature, vol. 12(1), pages 1-18, December.
    2. Elizabeth G. Reisman & Javier Botella & Cheng Huang & Ralf B. Schittenhelm & David A. Stroud & Cesare Granata & Owala S. Chandrasiri & Georg Ramm & Viola Oorschot & Nikeisha J. Caruana & David J. Bish, 2024. "Fibre-specific mitochondrial protein abundance is linked to resting and post-training mitochondrial content in the muscle of men," Nature Communications, Nature, vol. 15(1), pages 1-19, December.
    3. Victor A B Costa & Adrian W Midgley & Sean Carroll & Todd A Astorino & Tainah de Paula & Paulo Farinatti & Felipe A Cunha, 2021. "Is a verification phase useful for confirming maximal oxygen uptake in apparently healthy adults? A systematic review and meta-analysis," PLOS ONE, Public Library of Science, vol. 16(2), pages 1-33, February.

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