The relevance of BBB and IB permeability changes as a major precipitating cause for cognitive and digestive dysfunction in the military stress setting.

Inclusion Criteria:

• Healthy male troops (aged 18-50 yrs) scheduled to be engaged in a protracted multi-day stressful field exercises.

Exclusion Criteria:

• Significantly systemic disease, including cardiovascular, psychiatric, neurological (including polyneuropathies) and endocrine disease including diabetes mellitus.
• No written informed consent obtained from subject.

Healthy male troops during combat training