Voluntary Drinking Cessation is Associated with Recovery of Plasma Osmolality but not of Thirst Perception, Usg, Or Body Mass
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Date
2017Author
Capitán Jiménez, Catalina
Aragón Vargas, Luis Fernando
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Post-exercise rehydration has been widely studied, with special emphasis on retention
of ingested fluid; little research has been done on why we drink more or less. Purpose:
To identify if voluntary drinking cessation coincides with a return to pre-exercise
physiological values. Methods:9 males consented to participate. They exercised
intermittently (30 min bicycle-30 min treadmill , at 70-80% HRmax) in the heat
(WBGT= 28.1±0.7°C), to a dehydration of 3.6±0.3% body mass (BM). Upon exercise
termination, participants were instructed to drink as long and as much as they needed
while monitoring water intake. When intake was less than 100mL in 15 min, that
was considered the point of voluntary drinking cessation. Urine color (Ucolor), specific
gravity (USG), and osmolality (Uosm), plasma osmolality (Posm), fullness, and thirst
perception (TP) were measured pre- and post-exercise, and post-rehydration. Matched
pairs analyses were performed to compare pre-exercise and post-rehydration. Results:
At the point of drinking cessation, participants had recovered 58.7±12% (1445-
2427mL, min-max) of body mass loss.
Variable Pre-exer (mean±SD) Post- rehy
(mean±SD) t p
Posm 289.5±2.3 287.3±5.4 -1.11 0.300
Uosm 870.7±2.3 763.7±193.9 -1.49 0.175
Thirst 36.2±19.1 25.0±18.2 -2.32 0.049
BM 83.0±12.6 81.8±12.0 -3.99 0.004
USG 1.022±0.004 1.029±0.004 5.82 0.0004
Ucolor 3.4±0.7 6.3±1.1 6.83 0.0001
Fullness 3.1±0.9 2.1±1.1 -1.80 0.1080
Conclusion: the results suggest that voluntary drinking cessation coincided with a
return to pre-exercise values of Posm, Uosm , and fullness, even though rehydration was
under 60%. Nevertheless, body weight, thirst perception, urine color and USG had not
returned to pre-exercise values at the same point
External link to the item
10.1249/01.mss.0000519235.12565.77Collections
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