sqad...are you a doctor? no i didnt think so.
it is a test also used for appenicits - which you would be aware of it yo were so knowledgable.
you really should check your own facts before spouting off, and accusing others of giving dangerous and misleading advice.
type appendicitis and rebound tenderness/pain into google... you will see pages of information on this and how it is used to diagnose appendicitis.
# Physical Examination
Details about the abdominal pain are key to diagnosing appendicitis. The doctor will assess pain by touching or applying pressure to specific areas of the abdomen.
Responses that may indicate appendicitis include
•Guarding. Guarding occurs when a person subconsciously tenses the abdominal muscles during an examination. Voluntary guarding occurs the moment the doctor’s hand touches the abdomen. Involuntary guarding occurs before the doctor actually makes contact.
•Rebound tenderness. A doctor tests for rebound tenderness by applying hand pressure to a patient’s abdomen and then letting go. Pain felt upon the release of the pressure indicates rebound tenderness. A person may also experience rebound tenderness as pain when the abdomen is jarred—for example, when a person bumps into something or goes over a bump in a car.
http://digestive.nidd...es/pubs/appendicitis/
http://health.howstuffworks.com/appendix1.htm
there are plenty of others - i suggest you look