Skydiving as a Model of Psychological Stress and Its Effect on Intestinal Barrier Function

Inclusion Criteria: 1. Written informed consent prior to any study related procedures 2. Age \> 18 till \<50 3. Novice skydivers (first or second tandem jump) 4. Signed up for tandem skydive 5. Willing to abstain from probiotic products or medications known to alter gastrointestinal function throughout the study Exclusion Criteria: 1. Abdominal surgery which might influence gastrointestinal function, except appendectomy and cholecystectomy. 2. Current diagnosis of hypertension. 3. Current diagnosis of psychiatric disease. 4. Over 100kg or with a body mass index over 35. 5. Systemic use of steroids in the last 6 weeks. 6. Use of antibiotics or antimicrobial medication in the last month. 7. Daily usage of non-steroidal anti-inflammatory drugs in the last 2 months or incidental use in the last 2 weeks prior to screening. 8. Usage of medications that could affect the barrier function, except oral contraceptives, during the 14 days prior to screening. 9. Diagnosed inflammatory gastrointestinal disease. 10. Regular use of probiotics in the last 6 weeks. 11. Smoking and/or chewable tobacco. 12. Planned changes to current diet or exercise regime. 13. Use of laxatives, anti-diarrhetics, anti-cholinergics within last 4 weeks prior to screening. 14. Use of immunosuppressant drugs within last 4 weeks prior to screening. 15. Women: Pregnancy, lactation. 16. Abuse of alcohol or drugs. 17. Any disease/condition which in the investigator's opinion could interfere with the intestinal barrier function. 18. Any clinically significant disease/condition which in the investigator's opinion could interfere with the results of the trial.