The influence of hydration status during prolonged endurance exercise on salivary antimicrobial proteins

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• 作者：Sophie C. Killer ; Ida S. Svendsen…
• 关键词：Hydration status ; Mucosal immunity ; Endurance exercise ; Salivary antimicrobial proteins
• 刊名：European Journal of Applied Physiology
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：115
• 期：9
• 页码：1887-1895
• 全文大小：658 KB
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• 作者单位：Sophie C. Killer (1)
  Ida S. Svendsen (1)
  Michael Gleeson (1)
  
  1. School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Human Physiology
  Occupational and Industrial Medicine
  Sports Medicine
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1439-6327

文摘

Purpose Antimicrobial proteins (AMPs) in saliva including secretory immunoglobulin A (SIgA), lactoferrin (SLac) and lysozyme (SLys) are important in host defence against oral and respiratory infections. This study investigated the effects of hydration status on saliva AMP responses to endurance exercise. Methods Using a randomized design, 10 healthy male participants (age 23?±?4?years, \(\dot{V}{\text{O}}_{{2{ \hbox{max} }}}\) 56.8?±?6.5?ml/kg/min) completed 2?h cycling at 60?% \(\dot{V}{\text{O}}_{{2{ \hbox{max} }}}\) in states of euhydration (EH) or dehydration (DH) induced by 24?h fluid restriction. Unstimulated saliva samples were collected before, during, immediately post-exercise and each hour for 3?h recovery. Results Fluid restriction resulted in a 1.5?±?0.5?% loss of body mass from baseline and a 4.3?±?0.7?% loss immediately post-exercise. Pre-exercise urine osmolality was higher in DH than EH and overall, saliva flow rate was reduced in DH compared with EH (p?<?0.05). Baseline SIgA secretion rates were not different between conditions; however, exercise induced a significant increase in SIgA concentration in DH (161?±?134 to 309?±?271?mg/L) which remained elevated throughout 3?h recovery. SLac secretion rates increased from pre- to post-exercise in both conditions which remained elevated in DH only. Overall, SLac concentrations were higher in DH than EH. Pre-exercise SLys concentrations were lower in DH compared with EH (1.6?±?2.0 vs. 5.5?±?6.7?mg/L). Post-exercise SLys concentrations remained elevated in DH but returned to pre-exercise levels by 1?h post-exercise in EH. Conclusions Exercise in DH caused a reduction in saliva flow rate yet induced greater secretion rates of SLac and higher concentrations of SIgA and SLys. Thus, DH does not impair saliva AMP responses to endurance exercise.