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    Monitoring salivary testosterone and cortisol concentrations across an international sports competition: Data comparison using two enzyme immunoassays and two sample preparations

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    eResearch_3145.pdf (494.8Kb)
    Date
    2013-03
    Author
    Crewther, B. T.
    Al-Dujaili, Emad A. S.
    Smail, Nacer Foudil
    Anastasova, S.
    Kilduff, L. P.
    Cook, C. J.
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    Citation
    Crewther, B., Al-Dujaili, E., Smail, N., Anastasova, S., Kilduff, L. & Cook, C. (2013) Monitoring salivary testosterone and cortisol concentrations across an international sports competition: Data comparison using two enzyme immunoassays and two sample preparations, Clinical Biochemistry, vol. 46, , pp. 354-358,
    Abstract
    Objectives: Salivary testosterone (T) and cortisol (C) concentrations were monitored across a sports competition. Data were compared using two enzyme-immunoassay (EIA) methods and two sample preparations to determine their influence on hormone concentrations. Design and methods: A group of male athletes (n=19) provided a saliva sample the morning before and one day after (24h post) an international rugby union match. Following an extraction procedure, the samples were analysed for T and C concentrations using a commercial kit (CME) and an in-house method (IHE). Raw samples (no extraction procedure) were also tested using the commercial kit (CMR). Results: There were no significant changes in T and C levels from pre to post competition with each EIA method and sample preparation, but significant differences in T (IHE>CME>CMR) and C (CMR>IHE and CME) concentrations were seen when both samples were pooled. Bland-Altman analyses confirmed the presence of fixed and proportional bias. Strong and significant correlations were demonstrated between the IHE and CME measures of salivary T (r=0.93-0.97) and C (r=0.95-0.97). The T and C values from the raw and extracted samples were also strongly correlated (r=0.93-0.96). Conclusions: The measurement of salivary T and C concentrations across an international sports event was influenced by different EIA methods and sample preparations, but all measures were strongly correlated with some bias. Both T and C were unresponsive to the sports event, but within the group results large individual variation was seen. 2012 The Canadian Society of Clinical Chemists.
    Official URL
    http://dx.doi.org/10.1016/j.clinbiochem.2012.11.019
    URI
    https://eresearch.qmu.ac.uk/handle/20.500.12289/3145
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    • Dietetics, Nutrition and Biological Sciences

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