The acute effects of fluid intake on urine specific gravity and fluid retention in a mildly dehydrated state
Deutscher übersetzter Titel: | Die akuten Auswirkungen von Flüssigkeitsaufnahme auf die urinspezifische Schwerkraft und Flüssigkeitszurückbehaltung in mäßig dehydriertem Zustand |
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Autor: | Logan-Sprenger, Heather M.; Spriet, Lawrence L. |
Erschienen in: | Journal of strength and conditioning research |
Veröffentlicht: | 27 (2013), 4, S. 1002-1008, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 1064-8011, 1533-4287 |
DOI: | 10.1519/JSC.0b013e31826052c7 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201305003460 |
Quelle: | BISp |
Abstract
Many athletes arrive at training sessions and competitions in a mildly hypohydrated (HYPO) state and are instructed to drink fluids before exercise to reach a euhydrated (HYD) state. Ten recreational athletes (6 women, 4 men; 71.9 ± 4.6 kg, 25.2 ± 0.9 years) participated in the studies to examine (a) the day-to-day variability of morning urine specific gravity (USG), (b) the effects of consuming 600 ml of water on the hydration status of HYD and HYPO (USG > 1.020) subjects, and (c) the effects of consuming water (W), salt-water (SW, 40 mM Na+), a carbohydrate-electrolyte solution with 3% or light carbohydrate (CES-L, 20 mM Na+) or a CES with 6% carbohydrate (CES, 20 mM Na+) on the hydration status of HYPO subjects. The hydration status was assessed with USG and body mass measures and urine volume collections. The day-to-day variability in morning USG (coefficient of variation = 0.2 ± 0.1%) was low and the responses to 600 ml of W ingestion were repeatable. Pretrial USG was 1.022 ± 0.001 in the HYPO trial and decreased <1.020 by 45 minutes (1.013 ± 0.003). In the CES study, HYPO subjects reached HYD status at 45 minutes in all conditions (W 1.013 ± 0.003, SW 1.013 ± 0.003, CES-L 1.011 ± 0.003, CES 1.017 ± 0.004) because salt or CES ingestion did not affect fluid retention (W 68%, SW 72%, CES-L 68%, CES 76%). This study demonstrated that mildly HYPO subjects could reach euhydration within 45 minutes of the ingestion of 600 ml of W or a combination of salt and CES solutions. Following this practice will minimize the incidence of starting a practice or competition hypohydrated. Verf.-Referat