Saliva indices track hypohydration during 48h of fluid restriction or combined fluid and energy restriction
Oliver, S. J., Laing, S. J., Wilson, S., Bilzon, J. L. J. and Walsh, N. P., 2008. Saliva indices track hypohydration during 48h of fluid restriction or combined fluid and energy restriction. Archives of Oral Biology, 53 (10), pp. 975-980.
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Objective: To investigate whether unstimulated whole saliva flow rate (UFR) and osmolality (Sosm) track changes in hydration status during 48 h of restricted fluid intake (RF) or combined fluid and energy restriction (RF + RE). Following the 48 h periods, UFR and Sosm were assessed after acute exercise dehydration and rehydration. Design: Thirteen healthy males completed three trials in a randomised order: control (CON) where participants received their estimated energy (12,154 ± 230 kJ/d: mean ± S.E.M) and fluid (3912 ± 140 ml/d) requirements, RF trial where participants received their energy requirements and 193 ± 19 ml/d water to drink (total fluid 960 ± 15 ml/d) and RF + RE where participants received 1214 ± 25 kJ/d and 962 ± 16 ml/d. After 48 h, participants completed 30 min of maximal exercise followed by rehydration (0–2 h) and refeeding (2–6 h). Results: At 48 h body mass loss exceeded 3% on RF and RF + RE. UFR decreased during 48 h on RF (510 ± 122 to 169 ± 37 μl/min) and RF + RE (452 ± 92 to 265 ± 53 μl/min) and was lower than CON at 48 h (441 ± 90 μl/min: P < 0.05). Sosm increased during 48 h on RF (54 ± 3 to 73 ± 5 mOsmol/kg) and RF + RE (52 ± 3 to 68 ± 5 mOsmol/kg) and was greater than CON at 48 h (52 ± 2 mOsmol/kg: P < 0.05). Unlike UFR, Sosm identified the additional hypohydration associated with exercise (P < 0.05) and returned to within 0 h values with rehydration. Conclusions: Sosm, and to a lesser extent UFR, track hydration status during a 48 h period of RF or RF + RE and after subsequent exercise and rehydration.
|Creators||Oliver, S. J., Laing, S. J., Wilson, S., Bilzon, J. L. J. and Walsh, N. P.|
|Departments||Faculty of Humanities & Social Sciences > Health|
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