Glossary V

V

Validity

The extent to which a measure accurately reflects the concept that it is intended to measure.

Valsalva maneuver

Voluntary increasing pressure in the abdominal cavity with the diaphragm and abdominal muscles to bear down on the rectum to facilitate defecation.

Villi

Tiny finger-like projections on the surface of the small intestine that help absorb nutrients.

Viscera

Internal organs such as the gut/intestines or bladder.

Visceral

Relating to the internal organs, such as the gut/intestines or bladder.

Visceral hypersensitivity (intestinal)

Enhanced perception, or enhanced responsiveness within the gut — even to normal events.