Power calculation RIC has shown to increase tissue oxygen tension (a measure of microcirculation) in a short-term study we hypothesize that RIC treatment will increase tissue oxygen tension in the feet (Primary outcome) by 13% (SD = 10%). With 90% power and a two sided significance level of 0.05 the sample size needed to detect this change is 16 in each group - 32 participants in total. Taking a drop-out ratio of 10% into account and given the inaccurate nature of this power calculation the sample size of the study will be 20 patients in each group.