Physical Activity and Gastrointestinal Investigations

This is an observational study, which aims to compare the outcomes of ambulatory gastrointestinal investigations with physical activity using accelerometry. An ambulatory study refers to one in which the patient is monitored freely, often outside of the hospital environment. For this the investigators will use a lightweight (7.4g) tri-axial accelerometer worn behind the ear. Hypothesis 1 There is no change in the amount or nature of physical activity taken by patients during ambulatory oesophageal pH monitoring or capsule endoscopy. Hypothesis 2 There is no correlation between physical activity levels and speed of gastrointestinal transit.