| Salivary immunoglobulin A response at rest and after exercise following a 48 h period of fluid and/or energy restriction. | |
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MedLine Citation:
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PMID: 17381977 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The aim was to investigate the effects of a 48 h period of fluid, energy or combined fluid and energy restriction on salivary IgA (s-IgA) responses at rest and after exercise. Thirteen healthy males (age 21 (sem 1) years) participated in four randomised 48 h trials. In the control trial participants received their estimated energy (12,154 (sem 230) kJ/d) and water (3912 (sem 140) ml/d) requirements. On fluid restriction (FR) participants received their energy requirements and 193 (sem 19) ml water/d to drink and on energy restriction (ER) participants received their water requirements and 1214 (sem 25) kJ/d. Fluid and energy restriction (F+ER) was a combination of FR and ER. After 48 h, participants performed a 30 min treadmill time trial (TT) followed by rehydration (0-2 h) and refeeding (2-6 h). Unstimulated saliva was collected at 0, 24 and 48 h, post-TT, and 2 and 6 h post-TT. Saliva flow rate (sflw) and s-IgA (ELISA) remained unchanged in control conditions and on ER. However, 48 h on FR decreased sflw (64 %) which most probably accounted for the increase in s-IgA concentration (P < 0.01). Despite a decrease in sflw (54 %), s-IgA concentration did not increase on F+ER, resulting in a decreased s-IgA secretion rate by 24 h (0 h: 20 (sem 2); 24 h: 12 (sem 2) microg/min; P < 0.01). Post-TT s-IgA secretion rate was not lower compared with 48 h on any trial. s-IgA secretion rate returned to within 0 h values by 6 h post-TT on F+ER. In conclusion, a 24-48 h period of combined F+ER decreased s-IgA secretion rate but normalisation occurred upon refeeding. |
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Authors:
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Samuel J Oliver; Stewart J Laing; Sally Wilson; James L J Bilzon; Robert Walters; Neil P Walsh |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't Date: 2007-03-07 |
Journal Detail:
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Title: The British journal of nutrition Volume: 97 ISSN: 0007-1145 ISO Abbreviation: Br. J. Nutr. Publication Date: 2007 Jun |
Date Detail:
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Created Date: 2007-05-25 Completed Date: 2007-07-16 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0372547 Medline TA: Br J Nutr Country: England |
Other Details:
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Languages: eng Pagination: 1109-16 Citation Subset: IM |
Affiliation:
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School of Sport, Health and Exercise Sciences, University of Wales, Bangor LL57 2PZ, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Blood Glucose / metabolism Diet Drinking / physiology Energy Intake / physiology Exercise / physiology* Fatty Acids, Nonesterified / blood Food Deprivation / physiology* Humans Hydrocortisone / blood Immunoglobulin A, Secretory / metabolism* Male Plasma Volume Saliva / immunology* Salivation Specimen Handling / methods Water Deprivation / physiology* |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Fatty Acids, Nonesterified; 0/Immunoglobulin A, Secretory; 50-23-7/Hydrocortisone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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