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(2016)
摘要
The purpose of this study was to evaluate the response of urine specific gravity (U-sg) and urine osmolality (U-osm) when compared with plasma osmolality (P-osm) from euhydration to 3% dehydration and then a 2-hour rehydration period in male and female collegiate athletes. Fifty-six National Collegiate Athletic Association (NCAA) wrestlers (mean +/- SEM); height 1.75 +/- 0.01 m, age 19.3 +/- 0.2 years, and body mass (BM) 78.1 +/- 1.8 kg and 26 NCAA women's soccer athletes; height 1.64 +/- 0.01 m, age 19.8 +/- 0.3 years, and BM 62.2 +/- 1.2 kg were evaluated. Hydration status was obtained by measuring changes in P-osm, U-osm, U-sg, and BM. Male and female subjects dehydrated to achieve an average BM loss of 2.9 +/- 0.09% and 1.9 +/- 0.03%, respectively. Using the medical diagnostic decision model, the sensitivity of Usg was high in both the hydrated and dehydrated state for males (92%) and females (80%). However, the specificity of U-sg was low in both the hydrated and dehydrated states for males (10 and 6%, respectively) and females (29 and 40%, respectively). No significant correlations were found between U-sg and P-osm during either the hydrated or dehydrated state for males or females. Based on these results, the use of U-sg as a field measure of hydration status in male and female collegiate athletes should be used with caution. Considering that athletes deal with hydration status on a regular basis, the reported low specificity of U-sg suggests that athletes could be incorrectly classified leading to the unnecessary loss of competition.
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关键词
dehydration,urine osmolality,division I athletes,euhydration
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