Received 5 March 2011, Accepted 24 March 2011, Available online 23 June 2011. Spontaneous pneumomediastinum is defined as free air within the mediastinum, not associated with trauma. Causes include exercise, drugs, asthma, vomiting, difficult labour and Valsalva maneuvers. Itâs a rare, usually benign and self-limited condition, more prevalent in young males.
A youth bouncing on a trampoline. A trampoline is a device consisting of a piece of taut, strong fabric stretched over a steel frame using many coiled springs. People bounce on trampolines for recreational and competitive purposes.
The typical rebound mini-trampoline is about 3' in diameter and 9 high. It is safe, easy to use, and effective. Research has led some scientists to conclude that jumping on a mini-trampoline is possibly the most effective exercise yet devised by man, especially because of the effect rebounding has on the lymph in the body.