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Indexed/Abstracted in: BIOSIS Previews, EMBASE, Scopus, Emerging Sources Citation Index
Online ISSN 1827-1812
Ishikawa T. 1, Minami K. 2, Ishiguro H. 1, Torisu Y. 1, Ishida J. 1
1 Division of Gastroenterology and Hepatology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan;
2 Department of Orthopedic Surgery, Nippon Medical School Chiba Hokusoh Hospital, Chiba, Japan
AIM: The aim of this study was to investigate the hydration status and perceptual response of sumo wrestlers after intake of an oral rehydration solution (ORS) or sports drink (SPD) during training in a hot environment.
METHODS: Ten male participants, members of a university sumo club, ingested ORS (sodium 50 mEq/L, 2.5% carbohydrate) or SPD (sodium 20 mEq/L, 6% carbohydrate) during sumo training in a randomized crossover manner at a wet bulb globe temperature of 27-30 °C. Body weight, water distribution (bioelectrical impedance), vital signs, hematological and serum biochemical variables, and Visual Analogue Scale (VAS) for fatigue and thirst were evaluated. Results are expressed as mean±SD (ORS vs. SPD). Statistical analysis included ANOVA.
RESULTS: We observed significant effect of drinks in terms of the change from the baseline value of extracellular fluid (0.50±0.16 vs. 0.31±0.24 L; p=0.020), hemoglobin (0.03±0.45 vs. 0.31±0.51 g/dL; p=0.015), osmolality (0.4±3.5 vs. -2.7±3.9 mOsm; p=0.015), total protein (0.34±0.23 vs. 0.63±0.26 g/dL; P=0.007), glucose (45±24 vs. 63±27 mg/dL; P=0.019), sodium (0.20±2.04 vs. -1.40±2.07 mEq/L; P<0.001), chloride (3.10±1.45 vs. 1.70±1.95 mEq/L; P=0.008), and VAS scores of fatigue (64±24 vs. 80±13; P=0.026) and thirst (31±15 vs. 49±21; P=0.031).
CONCLUSION: Although overall hydration status as indicated by body weight changes did not differ between the drinks, the changes from the baseline value of some measurement items suggested favorable effects of ORS. Since maintenance of the hydration status is important for physical condition, further study is merited to clarify the usefulness of ORS intake during exercise in a hot environment.