ArticleEuropean journal of applied physiology2013
Comparison between blood and urinary fluid balance indices during dehydrating exercise and the subsequent hypohydration when fluid is not restored.
Article in European journal of applied physiology, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers, 2 of them syntheses that pooled it.
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Who cites it
15 citing papers in PubMed, 2 syntheses or guidelines pooled it.
- Hydration, Hyperthermia, Glycogen, and Recovery: Crucial Factors in Exercise Performance-A Systematic Review and Meta-Analysis.Nutrients · 2023Pooled it
- Fluid balance and hydration status in combat sport Olympic athletes: a systematic review with meta-analysis of controlled and uncontrolled studies.European journal of nutrition · 2019Pooled it
- Article
- Examining the effects of pre-competition rapid weight loss on hydration status and competition performance in elite judo athletes.Scientific reports · 2023Article
- A Portable Biodevice to Monitor Salivary Conductivity for the Rapid Assessment of Fluid Status.Journal of personalized medicine · 2021Article
- Reviewing the current methods of assessing hydration in athletes.Journal of the International Society of Sports Nutrition · 2020Review
- Up in the Air: Evidence of Dehydration Risk and Long-Haul Flight on Athletic Performance.Nutrients · 2020Review
- Evaluation and review of body fluids saliva, sweat and tear compared to biochemical hydration assessment markers within blood and urine.European journal of clinical nutrition · 2018Review
- A comparative evaluation of two decompression procedures for technical diving using inflammatory responses: compartmental versus ratio deco.Diving and hyperbaric medicine · 2017Article
- Validity of Urine Specific Gravity When Compared With Plasma Osmolality as a Measure of Hydration Status in Male and Female NCAA Collegiate Athletes.Journal of strength and conditioning research · 2016Article
- Validity of hydration non-invasive indices during the weightcutting and official weigh-in for Olympic combat sports.PloS one · 2014Article
- Authors' response: Comparison between blood and urinary fluid balance indices during dehydrating exercise and the subsequent hypohydration when fluid is not restored.European journal of applied physiology · 2013Article
- Comparison between blood and urinary indices for dehydration: a different interpretation.European journal of applied physiology · 2013Article
- Is urinary specific gravity a useful simple marker of fluid depletion in athletes?European journal of applied physiology · 2013Article
- Authors' response. Comparison between blood and urinary fluid balance indices during dehydrating exercise and the subsequent hypohydration when fluid is not restored.European journal of applied physiology · 2013Article
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3 authors.
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Abstract
Blood serum osmolality (S (OSM)) is the gold standard to assess body fluid balance. Urine specific gravity (U (SG)) is also a body fluid balance index but it is not invasive. However, U (SG) capability to detect the minimal level of dehydration that affects athletic performance (i.e., 2 %) remains untested. We collected urine and blood samples in eighteen euhydrated trained athletes in the morning and that evening while dehydrating by 1, 2, and 3 % of body mass by cycling (60 % VO₂peak) in the heat (32 °C, 46 % rh, 2.5 m s(-1) air flow). At 9:00 pm, subjects left the laboratory and went to bed after ingesting 0.7 ± 0.2 L of a sports drink. The next morning, subjects awoke 3 % hypohydrated, and blood and urine samples were collected and test terminated. We found that 2 % dehydration increased S (OSM) and U (SG) above exercise-baseline values (P < 0.05). The next morning, S (OSM) and U (SG) remained elevated compared to the first morning while euhydrated (287 ± 5 vs. 282 ± 3 mOsmol kg(-1) H(2)O and 1.028 ± 0.003 vs. 1.017 ± 0.005, respectively, P < 0.05). However, when comparing 3 % dehydration (end of exercise) to 3 % hypohydration (next morning), U (SG) increased (1.025 ± 0.003 to 1.028 ± 0.003; P < 0.05) while S (OSM) decreased (295 ± 5 to 287 ± 5 mOsmol kg(-1) H(2)O; P < 0.05). In summary, during exercise-induced dehydration, U (SG) is as sensitive as S (OSM) to detect low levels of dehydration (i.e., 2 %). Both indices maintain the ability to detect a 3 % overnight hypohydration although S (OSM) approaches euhydration values, while U (SG) remains a superior index to detect hypohydration.
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