Results IAP measurements without wearing the abdominal binder were found to be surprisingly high with a range between 8,0 and 16,7 mmHg. (mean 10,5 mmHg.). This finding is explained by the fact that the subjects were not under relaxation and the fact that half of the subjects according to their BMI were categorised as being overweight or fat. Other investigations have demonstrated that relaxation decreases IAP and that BMI is positively related to IAP.