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Saliva indices track hypohydration during 48h of fluid restriction or combined fluid and energy restriction
- Source :
- Archives of Oral Biology. 53:975-980
- Publication Year :
- 2008
- Publisher :
- Elsevier BV, 2008.
-
Abstract
- To investigate whether unstimulated whole saliva flow rate (UFR) and osmolality (Sosm) track changes in hydration status during 48h of restricted fluid intake (RF) or combined fluid and energy restriction (RF+RE). Following the 48h periods, UFR and Sosm were assessed after acute exercise dehydration and rehydration.Thirteen healthy males completed three trials in a randomised order: control (CON) where participants received their estimated energy (12,154+/-230kJ/d: mean+/-S.E.M) and fluid (3912+/-140ml/d) requirements, RF trial where participants received their energy requirements and 193+/-19ml/d water to drink (total fluid 960+/-15ml/d) and RF+RE where participants received 1214+/-25kJ/d and 962+/-16ml/d. After 48h, participants completed 30min of maximal exercise followed by rehydration (0-2h) and refeeding (2-6h).At 48h body mass loss exceeded 3% on RF and RF+RE. UFR decreased during 48h on RF (510+/-122 to 169+/-37microl/min) and RF+RE (452+/-92 to 265+/-53microl/min) and was lower than CON at 48h (441+/-90microl/min: P0.05). Sosm increased during 48h on RF (54+/-3 to 73+/-5mOsmol/kg) and RF+RE (52+/-3 to 68+/-5mOsmol/kg) and was greater than CON at 48h (52+/-2mOsmol/kg: P0.05). Unlike UFR, Sosm identified the additional hypohydration associated with exercise (P0.05) and returned to within 0h values with rehydration.Sosm, and to a lesser extent UFR, track hydration status during a 48h period of RF or RF+RE and after subsequent exercise and rehydration.
- Subjects :
- Male
medicine.medical_specialty
Saliva
Motor Activity
Young Adult
Fluid intake
Animal science
Weight loss
Internal medicine
Weight Loss
medicine
Humans
Dehydration
Exercise physiology
Exercise
General Dentistry
Hydration status
Water Deprivation
Chemistry
Osmolar Concentration
Cell Biology
General Medicine
medicine.disease
Endocrinology
Otorhinolaryngology
Fluid Therapy
Maximal exercise
Fluid restriction
medicine.symptom
Energy Intake
Salivation
Biomarkers
Subjects
Details
- ISSN :
- 00039969
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Archives of Oral Biology
- Accession number :
- edsair.doi.dedup.....b5c68dfd8a12e365f8c66811a2a0cfb4
- Full Text :
- https://doi.org/10.1016/j.archoralbio.2008.05.002