Aerobic exercise before diving reduces venous gas bubble formation in XXXX .

@entity1 @entity1009 @entity5663 @entity35 @entity1211
We have previously shown in a @entity35 model that a single bout of high-intensity aerobic exercise 20 h before a simulated dive reduces bubble formation and after the dive protects from lethal @entity5663 . The present study investigated the importance of these findings in @entity1 . Twelve healthy male divers were compressed in a hyperbaric chamber to 280 kPa at a rate of 100 kPa @entity1009 ) breathing air and remaining at pressure for 80 min. The ascent rate was 9 m @entity1009 ) with a 7 min stop at 130 kPa. Each diver underwent two randomly assigned simulated dives, with or without preceding exercise. A single interval exercise performed 24h before the dive consisted of treadmill running at 90% of maximum heart rate for 3 min, followed by exercise at 50% of maximum heart rate for 2 min; this was repeated eight times for a total exercise period of 40 min. @entity1211 bubbles were monitored with an ultrasonic scanner every 20 min for 80 min after reaching surface pressure. The study demonstrated that a single bout of strenuous exercise 24h before a dive to 18 m of seawater significantly reduced the average number of bubbles in the pulmonary artery from 0.98 to 0.22 bubbles cm(-2)(P= 0.006) compared to dives without preceding exercise. The maximum bubble grade was decreased from 3 to 1.5 (P= 0.002) by pre-dive exercise, thereby increasing safety. This is the first report to indicate that pre-dive exercise may form the basis for a new way of preventing serious @entity5663 .
