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.
A study performed by NASA concluded that jumping on a mini trampoline -- also called rebounding or urban rebounding -- is an extremely potent weight-loss exercise. What makes rebounding so effective at burning calories and strengthening the entire body is the effect of Earth's gravitational force. At the bottom of ...