The utility of hydration markers to identify mild hypertonic and isotonic hypohydration

    Allbwn ymchwil: Cyfraniad at gynhadleddMurlenadolygiad gan gymheiriaid

    Crynodeb

    The study aim was to assess the utility of common hydration
    markers to identify mild hypertonic and isotonic hypohydration.
    Fifteen males completed three randomized 48-hr trials,
    where energy intake was standardized throughout. On day 1,
    participants completed a hydration assessment followed by
    high-intensity aerobic exercise. After exercise, they began one
    of three trials. On the control trial (CON) participants consumed
    adequate fluid to maintain euhydration. On the isotonic hypohydration
    trial (IH) participants ingested the same fluid as on
    CON, but at 0800 hr on day 3 they consumed 0.65 mg/kg of
    the diuretic furosemide. On the hypertonic hypohydration trial
    (HH), drinking fluids were restricted to 2ml/kg/day for 48 hr
    after the exercise on day 1. After 48 hr, the participants completed
    a second hydration assessment. Dehydration on HH and
    IH was equal to 1.9% and 2.0% of body mass, respectively. Urinary
    markers showed the best utility to identify mild hypertonic
    hypohydration (Ucol: 2 ± 1, 6 ± 1, 2 ± 1; Usg: 1.008 ± 0.004,
    1.028 ± 0.005, 1.011 ± 0.004; Uosm: 260 ± 136, 1043 ± 130,
    404 ± 106, CON, HH, and IH, respectively; HH vs CON effect
    sizes: d = 5.6, 4.4, 5.6, Ucol, Usg, and Uosm, respectively),
    while plasma osmolality (Posm), saliva osmolality (Sosm), and
    saliva flow rate (Sfr) showed moderate utility (Posm: 286 ± 4,
    296 ± 6, 286 ± 4; Sosm: 55 ± 13, 65 ± 12, 56 ± 12; Sfr: 380 ±
    240, 212 ± 173, 431 ± 310, CON, HH, and IH, respectively;
    HH vs CON effect sizes: d = 1.8, 0.7, 0.8, Posm, Sosm, and
    Sfr, respectively). Isotonic dehydration was poorly identified by
    most hydration markers, with the exception of heart rate change
    (LSΔHR) from lying to standing (LSΔHR: 14 ± 8, 19 ± 10, 26
    ± 12, CON, HH, and IH, respectively; HH vs CON effect size:
    d = 0.6). Hydration marker utility is dependent on the type of
    hypohydration. These results highlight how some commonly
    used hydration markers may misdiagnose athletes and patients.
    Iaith wreiddiolSaesneg
    TudalennauS7
    StatwsCyhoeddwyd - 1 Chwef 2013
    DigwyddiadInternational Sports and Exercise Nutrition Conference in Newcastle upon Tyne. - Northumbria University, Newcastle upon Tyne, Y Deyrnas Unedig
    Hyd: 13 Rhag 201215 Rhag 2012

    Cynhadledd

    CynhadleddInternational Sports and Exercise Nutrition Conference in Newcastle upon Tyne.
    Teitl crynoISENC 2012
    Gwlad/TiriogaethY Deyrnas Unedig
    DinasNewcastle upon Tyne
    Cyfnod13/12/1215/12/12

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