Department of Human Nutrition and Hospitality Management

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Browsing Department of Human Nutrition and Hospitality Management by Author "Armstrong, Lawrence E."

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    Practical Hydration Solutions for Sports
    (MDPI, 2019) Belval, Luke N.; Hosokawa, Yuri; Casa, Douglas J.; Adams, William M.; Armstrong, Lawrence E.; Baker, Lindsay B.; Burke, Louise; Cheuvront, Samuel; Chiampas, George; Gonzalez-Alonso, Jose; Huggins, Robert A.; Kavouras, Stavros A.; Lee, Elaine C.; McDermott, Brendon P.; Miller, Kevin; Schlader, Zachary; Sims, Stacy; Stearns, Rebecca L.; Troyanos, Chris; Wingo, Jonathan; University of Connecticut; Waseda University; University of North Carolina; University of North Carolina Greensboro; Australian Institute of Sport; Brunel University; Arizona State University; Arizona State University-Downtown Phoenix; University of Arkansas Fayetteville; Central Michigan University; State University of New York (SUNY) Buffalo; University of Waikato; University of Alabama Tuscaloosa
    Personalized hydration strategies play a key role in optimizing the performance and safety of athletes during sporting activities. Clinicians should be aware of the many physiological, behavioral, logistical and psychological issues that determine both the athlete's fluid needs during sport and his/her opportunity to address them; these are often specific to the environment, the event and the individual athlete. In this paper we address the major considerations for assessing hydration status in athletes and practical solutions to overcome obstacles of a given sport. Based on these solutions, practitioners can better advise athletes to develop practices that optimize hydration for their sports.
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    Urinary markers of hydration during 3-day water restriction and graded rehydration
    (Springer, 2020) Johnson, Evan C.; Huffman, Ainsley E.; Yoder, Hillary; Dolci, Alberto; Perrier, Erica T.; Larson-Meyer, D. Enette; Armstrong, Lawrence E.; University of Wyoming; University of Utah; University of Alabama Tuscaloosa; Danone Nutricia
    Purpose This investigation had three purposes: (a) to evaluate changes in hydration biomarkers in response to a graded rehydration intervention (GRHI) following 3 days of water restriction (WR), (b) assess within-day variation in urine concentrations, and (c) quantify the volume of fluid needed to return to euhydration as demonstrated by change inU(col). Methods 115 adult males and females were observed during 1 week of habitual fluid intake, 3 days of fluid restriction (1000 mL day(-1)), and a fourth day in which the sample was randomized into five different GRHI groups: no additional water, CON; additional 500 mL,G(+0.50); additional 1000 mL,G(+1.00); additional 1500 mL,G(+1.50); additional 2250 mL,G(+2.25). All urine was collected on 1 day of the baseline week, during the final 2 days of the WR, and during the day of GRHI, and evaluated for urine osmolality, color, and specific gravity. Results Following the GRHI, onlyG(+1.50)andG(+2.25)resulted in all urinary values being significantly different from CON. The mean volume of water increase was significantly greater for those whoseU(col)changed from > 4 to < 4 (+ 1435 +/- 812 mL) than those whoseU(col)remained >= 4 (+ 667 +/- 722 mL,p < 0.001). Conclusions An additional 500 mL of water is not sufficient, while approximately 1500 mL of additional water (for a total intake between 2990 and 3515 mL day(-1)) is required to return to a urine color associated with adequate water intake, following 3 days of WR.