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    The Efficacy of the Lactate Threshold: A Sex-Based Comparison

    Access Status
    Fulltext not available
    Authors
    Hoffmann, S.
    Skinner, T.
    van Rosendal, S.
    Osborne, M.
    Emmerton, Lynne
    Jenkins, D.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Hoffmann, S. and Skinner, T. and van Rosendal, S. and Osborne, M. and Emmerton, L. and Jenkins, D. 2018. The Efficacy of the Lactate Threshold: A Sex-Based Comparison. Journal of Strength Conditioning Research.
    Source Title
    Journal of Strength Conditioning Research
    DOI
    10.1519/JSC.0000000000002654
    ISSN
    1533-4287
    School
    School of Pharmacy and Biomedical Sciences
    URI
    http://hdl.handle.net/20.500.11937/69767
    Collection
    • Curtin Research Publications
    Abstract

    The second lactate threshold (LT2) has previously been associated with endurance performance; however, comparisons between sexes are lacking regarding its efficacy. The aim of this study was to compare LT2 between men and women, specifically regarding its (a) relationship with endurance performance and (b) capacity to establish training and competition intensities. Competitive male (mean ± SD: age, 27.7 ± 4.7 years; V[Combining Dot Above]O2max, 59.7 ± 5.2 ml·kg·min; n = 10) and female (mean ± SD: age, 27.3 ± 6.2 years; V[Combining Dot Above]O2max, 54.5 ± 5.3 ml·kg·min; n = 12) cyclists and triathletes completed an incremental cycle trial to volitional fatigue (for determination of V[Combining Dot Above]O2max and LT2 via the modified D-max method), a constant load (±5%) exercise trial of 30 minutes at LT2 power output, and a 40-km cycle time trial. The LT2 significantly correlated with 40-km cycling performance in both men (r = -0.69 to -0.77; p < 0.01-0.05) and women (r = -0.63 to -0.75; p < 0.01-0.05). All men sustained LT2 power output for 30 minutes, compared with 82% of women. Despite LT2 reflecting a similar heart rate, V[Combining Dot Above]O2, and [La] to those elicited during a 40-km time trial in both men and women, power output at LT2 was 6% higher (p < 0.05) than mean time trial power output in women, with no significant difference in men. Based on these findings, sex-specific recommendations have been suggested in regard to the use of LT2 for establishing performance potential, prescribing endurance training intensities and setting 40-km performance intensity.

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