Individual Differences in Acute Response to Experimental Inflammation: Microcirculatory Changes and Psychological Predictors

The physiological and behavioral responses to inflammatory vary greatly between individuals. The knowlegde about what causes these differences is sparse but plausible explanations are variations in sensitivity to peripheral inflammation. The goal of the study is to understand microcirculatory changes in skin and their possible correlation with conventional measurements of sickness and disease in humans. A better understanding of possible psychological predictors of sickness behaviour is also warranted as it may affect the results. The general aim of the study is to assess microcirculatory changes in skin of the face, chest, hands and feet using different optical imaging techniques, and to identify psychological predictors in the acute behavioral response to experimentally induced inflammation. The participants are healthy volunteers in the age of 18-40 years of both sex/genders. The main questions to answer are: 1. How do acute inflammation change microcirculation in the skin as measured by temperature, red blood cell concentration, blood flow and spectral changes correlated with fluids and other proteins. 2. Can a stronger behavioral response to experimental endotoxemia be predicted by psychological factors of the individuals? It is a blinded with-in subject, crossover design where the participants will receive placebo-injection with saline on one study day and LPS-injection the other study day in a randomized order. Participants will on the study days * Fill in psychometric questionnaires * Be measured with bio-optical imaging methods at regular intervalls. * Be monitored with regular medical parameters such as blood pressure, oxygen saturation, puls etc When the volunteers feel recovered and the medical staff are confident of the recovery the volunteers will be discharged.